Quarterly report pursuant to Section 13 or 15(d)

Non-Controlling Interest Non-Controlling Interest (Schedule of Equity) (Details)

v2.4.1.9
Non-Controlling Interest Non-Controlling Interest (Schedule of Equity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2012
Noncontrolling Interest [Line Items]      
Balance, beginning of period $ 1,355,234us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest   $ 1,252,864us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Net income 27,919us-gaap_ProfitLoss 23,676us-gaap_ProfitLoss  
Other comprehensive income (loss):      
Unrealized holding gains (losses) on available-for-sale securities (3)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax  
Derivative holding gains (losses) 3,730us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 228us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax  
Foreign currency translation adjustments (16,755)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (5,878)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax  
Cash dividends (10,557)us-gaap_DividendsCash (9,762)us-gaap_DividendsCash  
Issuance of common stock under employee stock plans, net 6,661us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 8,377us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation  
Tax adjustment from stock plans 5,260us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet 2,608us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet  
Stock-based compensation expense 2,946us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 2,577us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue  
Balance, end of period 1,374,435us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,274,691us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,252,864us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Cash dividends per share $ 0.15us-gaap_CommonStockDividendsPerShareCashPaid $ 0.14us-gaap_CommonStockDividendsPerShareCashPaid  
Parent [Member]      
Noncontrolling Interest [Line Items]      
Balance, beginning of period 1,343,603us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
  1,245,418us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Net income 26,471us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
22,255us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Other comprehensive income (loss):      
Unrealized holding gains (losses) on available-for-sale securities (3)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Derivative holding gains (losses) 3,730us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
228us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Foreign currency translation adjustments (16,782)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
(5,380)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Cash dividends (10,557)us-gaap_DividendsCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
(9,762)us-gaap_DividendsCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Issuance of common stock under employee stock plans, net 6,661us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
8,377us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Tax adjustment from stock plans 5,260us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
2,608us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Stock-based compensation expense 2,946us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
2,577us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Balance, end of period 1,361,329us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,266,322us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
1,245,418us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Cash dividends per share $ 0.15us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
$ 0.14us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
 
Non-controlling Interest [Member]      
Noncontrolling Interest [Line Items]      
Balance, beginning of period 11,631us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  7,446us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Net income 1,448us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
1,421us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Other comprehensive income (loss):      
Unrealized holding gains (losses) on available-for-sale securities 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Derivative holding gains (losses) 0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Foreign currency translation adjustments 27us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(498)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Cash dividends 0us-gaap_DividendsCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_DividendsCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Issuance of common stock under employee stock plans, net 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Tax adjustment from stock plans 0us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Stock-based compensation expense 0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Balance, end of period $ 13,106us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 8,369us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 7,446us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember