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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Noncontrolling Interest [Line Items]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.18 $ 0.17 $ 0.54 $ 0.51
Balance, beginning of period     $ 1,581,511,000 $ 1,415,813,000
Net income $ 91,102,000 $ 86,552,000 118,671,000 112,873,000
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities 0 (4,000) 0 (2,000)
Derivative holding gains (losses) (8,606,000) 399,000 (16,368,000) (9,025,000)
Foreign currency translation adjustments 8,333,000 3,390,000 27,017,000 22,226,000
Cash dividends     (37,617,000) (35,548,000)
Issuance of common stock under employee stock plans, net     12,471,000 5,872,000
Stock-based compensation expense     8,277,000 8,454,000
Stock Repurchased During Period, Value     (35,542,000) (11,000)
Balance, end of period $ 1,658,420,000 $ 1,520,652,000 $ 1,658,420,000 $ 1,520,652,000
Parent [Member]        
Noncontrolling Interest [Line Items]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.18 $ 0.17 $ 0.54 $ 0.51
Balance, beginning of period     $ 1,560,820,000 $ 1,399,800,000
Net income     112,195,000 107,183,000
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities       (2,000)
Derivative holding gains (losses)     (15,993,000) (9,078,000)
Foreign currency translation adjustments     24,681,000 22,982,000
Cash dividends     (37,617,000) (35,548,000)
Issuance of common stock under employee stock plans, net     12,471,000 5,872,000
Stock-based compensation expense     8,277,000 8,454,000
Stock Repurchased During Period, Value     (35,542,000) (11,000)
Balance, end of period $ 1,629,292,000 $ 1,499,652,000 1,629,292,000 1,499,652,000
Non-controlling Interest [Member]        
Noncontrolling Interest [Line Items]        
Balance, beginning of period     20,691,000 16,013,000
Net income     6,476,000 5,690,000
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities       0
Derivative holding gains (losses)     (375,000) 53,000
Foreign currency translation adjustments     2,336,000 (756,000)
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 0
Balance, end of period $ 29,128,000 $ 21,000,000 $ 29,128,000 $ 21,000,000