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 ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Noncontrolling Interest [Line Items]    
Common Stock, Dividends, Per Share, Cash Paid $ 0.18 $ 0.17
Balance, beginning of period $ 1,581,511,000 $ 1,415,813,000
Net income 38,885,000 34,194,000
Other comprehensive income (loss):    
Unrealized holding gains (losses) on available-for-sale securities 4,000 (2,000)
Derivative holding losses (1,605,000) (8,504,000)
Foreign currency translation adjustments 11,502,000 18,521,000
Cash dividends (12,499,000) (11,841,000)
Issuance of common stock under employee stock plans, net 4,278,000 2,661,000
Stock-based compensation expense 2,941,000 3,073,000
Stock Repurchased During Period, Value (33,000,000)  
Balance, end of period $ 1,592,017,000 $ 1,453,915,000
Parent [Member]    
Noncontrolling Interest [Line Items]    
Common Stock, Dividends, Per Share, Cash Paid $ 0.18 $ 0.17
Balance, beginning of period $ 1,560,820,000 $ 1,399,800,000
Net income 36,006,000 31,770,000
Other comprehensive income (loss):    
Unrealized holding gains (losses) on available-for-sale securities 4,000 (2,000)
Derivative holding losses (1,527,000) (8,504,000)
Foreign currency translation adjustments 11,248,000 18,328,000
Cash dividends (12,499,000) (11,841,000)
Issuance of common stock under employee stock plans, net 4,278,000 2,661,000
Stock-based compensation expense 2,941,000 3,073,000
Stock Repurchased During Period, Value (33,000,000)  
Balance, end of period 1,568,271,000 1,435,285,000
Non-controlling Interest [Member]    
Noncontrolling Interest [Line Items]    
Balance, beginning of period 20,691,000 16,013,000
Net income 2,879,000 2,424,000
Other comprehensive income (loss):    
Unrealized holding gains (losses) on available-for-sale securities 0 0
Derivative holding losses (78,000) 0
Foreign currency translation adjustments 254,000 193,000
Cash dividends 0 0
Issuance of common stock under employee stock plans, net 0 0
Stock-based compensation expense 0 0
Stock Repurchased During Period, Value 0  
Balance, end of period $ 23,746,000 $ 18,630,000