Quarterly report pursuant to Section 13 or 15(d)

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

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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, 2014
Mar. 31, 2013
Noncontrolling Interest [Line Items]    
Balance, beginning of period $ 1,252,864  
Net income (loss) 23,676 10,102
Other comprehensive income (loss):    
Unrealized holding gains (losses) on available-for-sale securities 1 9
Derivative holding gains (losses) 228 1,430
Foreign currency translation adjustments (5,878) (12,657)
Cash dividends (9,762)  
Issuance of common stock under employee stock plans, net 8,377  
Tax adjustment from stock plans 2,608  
Stock-based compensation expense 2,577  
Balance, end of period 1,274,691 1,164,123
Parent [Member]
    
Noncontrolling Interest [Line Items]    
Balance, beginning of period 1,245,418  
Net income (loss) 22,255  
Other comprehensive income (loss):    
Unrealized holding gains (losses) on available-for-sale securities 1  
Derivative holding gains (losses) 228  
Foreign currency translation adjustments (5,380)  
Cash dividends (9,762)  
Issuance of common stock under employee stock plans, net 8,377  
Tax adjustment from stock plans 2,608  
Stock-based compensation expense 2,577  
Balance, end of period 1,266,322  
Cash dividends paid per share $ 0.28  
Non-controlling Interest [Member]
    
Noncontrolling Interest [Line Items]    
Balance, beginning of period 7,446  
Net income (loss) 1,421  
Other comprehensive income (loss):    
Unrealized holding gains (losses) on available-for-sale securities 0  
Derivative holding gains (losses) 0  
Foreign currency translation adjustments (498)  
Cash dividends 0  
Issuance of common stock under employee stock plans, net 0  
Tax adjustment from stock plans 0  
Stock-based compensation expense 0  
Balance, end of period $ 8,369