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 ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Noncontrolling Interest [Line Items]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.17 $ 0.15 $ 0.51 $ 0.45
Balance, beginning of period     $ 1,415,813 $ 1,355,234
Net income $ 86,552 $ 92,940 112,873 115,055
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities (4) (4) (2) (6)
Derivative holding gains (losses) 399 (6,667) (9,025) (4,947)
Foreign currency translation adjustments 3,390 (12,206) 22,226 (26,314)
Cash dividends     (35,548) (31,667)
Issuance of common stock under employee stock plans, net     5,872 12,268
Tax adjustment from stock plans       7,695
Stock-based compensation expense     8,454 8,731
Stock Repurchased During Period, Value (11)     (14,525)
Balance, end of period $ 1,520,652 $ 1,421,524 $ 1,520,652 $ 1,421,524
Parent [Member]        
Noncontrolling Interest [Line Items]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.17 $ 0.15 $ 0.51 $ 0.45
Balance, beginning of period     $ 1,399,800 $ 1,343,603
Net income     107,183 110,987
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities     (2) (6)
Derivative holding gains (losses)     (9,078) (4,947)
Foreign currency translation adjustments     22,982 (25,742)
Cash dividends     (35,548) (31,667)
Issuance of common stock under employee stock plans, net     5,872 12,268
Tax adjustment from stock plans       7,695
Stock-based compensation expense     8,454 8,731
Stock Repurchased During Period, Value $ (11)     (14,525)
Balance, end of period 1,499,652 $ 1,406,397 1,499,652 1,406,397
Non-controlling Interest [Member]        
Noncontrolling Interest [Line Items]        
Balance, beginning of period     16,013 11,631
Net income     5,690 4,068
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities     0 0
Derivative holding gains (losses)     53 0
Foreign currency translation adjustments     (756) (572)
Cash dividends     0 0
Issuance of common stock under employee stock plans, net     0 0
Tax adjustment from stock plans       0
Stock-based compensation expense     0 0
Stock Repurchased During Period, Value 0     0
Balance, end of period $ 21,000 $ 15,127 $ 21,000 $ 15,127