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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Noncontrolling Interest [Line Items]        
Balance, beginning of period     $ 1,355,234 $ 1,252,864
Net income $ (5,804) $ (6,738) 22,115 16,938
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities 1 3 (2) 4
Derivative holding gains (losses) (2,010) (1,037) 1,720 (809)
Foreign currency translation adjustments 2,647 8,934 (14,108) 3,056
Cash dividends     (21,113) (19,556)
Issuance of common stock under employee stock plans, net     9,840 16,136
Tax adjustment from stock plans     6,392 4,124
Stock-based compensation expense     5,939 5,208
Balance, end of period $ 1,351,492 $ 1,277,965 $ 1,351,492 $ 1,277,965
Cash dividends per share $ 0.15 $ 0.14 $ 0.30 $ 0.28
Stock Repurchased During Period, Value     $ 14,525  
Parent [Member]        
Noncontrolling Interest [Line Items]        
Balance, beginning of period     1,343,603 $ 1,245,418
Net income     19,926 15,926
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities     (2) 4
Derivative holding gains (losses)     1,720 (809)
Foreign currency translation adjustments     (14,134) 3,520
Cash dividends     (21,113) (19,556)
Issuance of common stock under employee stock plans, net     9,840 16,136
Tax adjustment from stock plans     6,392 4,124
Stock-based compensation expense     5,939 5,208
Balance, end of period $ 1,337,646 $ 1,269,971 $ 1,337,646 $ 1,269,971
Cash dividends per share $ 0.15 $ 0.14 $ 0.30 $ 0.28
Stock Repurchased During Period, Value     $ 14,525  
Non-controlling Interest [Member]        
Noncontrolling Interest [Line Items]        
Balance, beginning of period     11,631 $ 7,446
Net income     2,189 1,012
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities     0 0
Derivative holding gains (losses)     0 0
Foreign currency translation adjustments     26 (464)
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
Balance, end of period $ 13,846 $ 7,994 13,846 $ 7,994
Stock Repurchased During Period, Value     $ 0