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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Noncontrolling Interest [Line Items]        
Net Income (Loss) Attributable to Parent $ 100,152,000 $ 87,724,000    
Net Income (Loss) Attributable to Noncontrolling Interest $ 2,223,000 $ 3,378,000    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     $ 14,100,000  
Common Stock, Dividends, Per Share, Cash Paid $ 0.22 $ 0.18 $ 0.66 $ 0.54
Balance, beginning of period     $ 1,652,259,000 $ 1,581,511,000
Net income $ 102,375,000 $ 91,102,000 161,599,000 118,671,000
Other comprehensive income (loss):        
Unrealized holding gains on available-for-sale securities (162,000) 0 (158,000) 0
Derivative holding losses 2,896,000 (8,606,000) 18,542,000 (16,368,000)
Foreign currency translation adjustments (562,000) 8,333,000 (12,565,000) 27,017,000
Cash dividends     (46,160,000) (37,617,000)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     (21,332,000)  
Issuance of common stock under employee stock plans, net     12,286,000 12,471,000
Stock-based compensation expense     10,247,000 8,277,000
Stock Repurchased During Period, Value (67,116,000)   (107,222,000) (35,542,000)
Balance, end of period $ 1,681,596,000 $ 1,658,420,000 1,681,596,000 1,658,420,000
Parent [Member]        
Noncontrolling Interest [Line Items]        
Net Income (Loss) Attributable to Parent     154,996,000 112,195,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     14,100,000  
Common Stock, Dividends, Per Share, Cash Paid $ 0.44 $ 0.36    
Balance, beginning of period     1,621,951,000 1,560,820,000
Other comprehensive income (loss):        
Unrealized holding gains on available-for-sale securities     (158,000)  
Derivative holding losses     17,472,000 (15,993,000)
Foreign currency translation adjustments     (12,147,000) 24,681,000
Cash dividends     (46,160,000) (37,617,000)
Issuance of common stock under employee stock plans, net     12,286,000 12,471,000
Stock-based compensation expense     10,247,000 8,277,000
Stock Repurchased During Period, Value     (107,222,000) (35,542,000)
Balance, end of period $ 1,665,365,000 $ 1,629,292,000 1,665,365,000 1,629,292,000
Non-controlling Interest [Member]        
Noncontrolling Interest [Line Items]        
Net Income (Loss) Attributable to Noncontrolling Interest     6,603,000 6,476,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     0  
Balance, beginning of period     30,308,000 20,691,000
Other comprehensive income (loss):        
Unrealized holding gains on available-for-sale securities     0  
Derivative holding losses     1,070,000 (375,000)
Foreign currency translation adjustments     (418,000) 2,336,000
Cash dividends     0 0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     (21,332,000)  
Issuance of common stock under employee stock plans, net     0 0
Stock-based compensation expense     0 0
Stock Repurchased During Period, Value     0 0
Balance, end of period $ 16,231,000 $ 29,128,000 $ 16,231,000 $ 29,128,000