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
Mar. 31, 2016
Mar. 31, 2015
Noncontrolling Interest [Line Items]    
Balance, beginning of period $ 1,415,813 $ 1,355,234
Net income 34,194 27,919
Other comprehensive income (loss):    
Unrealized holding losses on available-for-sale securities (2) (3)
Derivative holding gains (losses) (8,504) 3,730
Foreign currency translation adjustments 18,521 (16,755)
Cash dividends (11,841) (10,557)
Issuance of common stock under employee stock plans, net 2,661 6,661
Tax adjustment from stock plans   5,260
Stock-based compensation expense 3,073 2,946
Balance, end of period $ 1,453,915 $ 1,374,435
Cash dividends per share $ 0.17 $ 0.15
Parent [Member]    
Noncontrolling Interest [Line Items]    
Balance, beginning of period $ 1,399,800 $ 1,343,603
Net income 31,770 26,471
Other comprehensive income (loss):    
Unrealized holding losses on available-for-sale securities (2) (3)
Derivative holding gains (losses) (8,504) 3,730
Foreign currency translation adjustments 18,328 (16,782)
Cash dividends (11,841) (10,557)
Issuance of common stock under employee stock plans, net 2,661 6,661
Tax adjustment from stock plans   5,260
Stock-based compensation expense 3,073 2,946
Balance, end of period $ 1,435,285 $ 1,361,329
Cash dividends per share $ 0.17 $ 0.15
Non-controlling Interest [Member]    
Noncontrolling Interest [Line Items]    
Balance, beginning of period $ 16,013 $ 11,631
Net income 2,424 1,448
Other comprehensive income (loss):    
Unrealized holding losses on available-for-sale securities 0 0
Derivative holding gains (losses) 0 0
Foreign currency translation adjustments 193 27
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
Balance, end of period $ 18,630 $ 13,106