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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Noncontrolling Interest [Line Items]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.17 $ 0.15 $ 0.34 $ 0.30
Balance, beginning of period     $ 1,415,813 $ 1,355,234
Net income $ (7,873) $ (5,804) 26,321 22,115
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities 4 1 2 (2)
Derivative holding gains (losses) (920) (2,010) (9,424) 1,720
Foreign currency translation adjustments 315 2,647 18,836 (14,108)
Cash dividends     (23,689) (21,113)
Issuance of common stock under employee stock plans, net     9,102 9,840
Tax adjustment from stock plans     (4,806) 6,392
Stock-based compensation expense     5,453 5,939
Stock Repurchased During Period, Value       (14,525)
Balance, end of period $ 1,437,608 $ 1,351,492 $ 1,437,608 $ 1,351,492
Parent [Member]        
Noncontrolling Interest [Line Items]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.17 $ 0.15 $ 0.34 $ 0.30
Balance, beginning of period     $ 1,399,800 $ 1,343,603
Net income     23,598 19,926
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities     2 (2)
Derivative holding gains (losses)     (9,424) 1,720
Foreign currency translation adjustments     19,485 (14,134)
Cash dividends     (23,689) (21,113)
Issuance of common stock under employee stock plans, net     9,102 9,840
Tax adjustment from stock plans     (4,806) 6,392
Stock-based compensation expense     5,453 5,939
Stock Repurchased During Period, Value       (14,525)
Balance, end of period $ 1,419,521 $ 1,337,646 1,419,521 1,337,646
Non-controlling Interest [Member]        
Noncontrolling Interest [Line Items]        
Balance, beginning of period     16,013 11,631
Net income     2,723 2,189
Other comprehensive income (loss):        
Unrealized holding losses on available-for-sale securities     0 0
Derivative holding gains (losses)     0 0
Foreign currency translation adjustments     (649) 26
Cash dividends     0 0
Issuance of common stock under employee stock plans, net     0 0
Tax adjustment from stock plans     0 0
Stock-based compensation expense     0 0
Stock Repurchased During Period, Value       0
Balance, end of period $ 18,087 $ 13,846 $ 18,087 $ 13,846