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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Noncontrolling Interest [Line Items]        
Balance, beginning of period     $ 1,355,234 $ 1,252,864
Net income $ 92,940 $ 67,932 115,055 84,870
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities (4) 0 (6) 4
Derivative holding gains (losses) (6,667) 5,098 (4,947) 4,289
Foreign currency translation adjustments (12,206) (15,883) (26,314) (12,827)
Cash dividends     (31,667) (29,369)
Issuance of common stock under employee stock plans, net     12,268 16,324
Tax adjustment from stock plans     7,695 4,201
Stock-based compensation expense     8,731 8,136
Balance, end of period $ 1,421,524 $ 1,326,535 $ 1,421,524 $ 1,326,535
Cash dividends per share $ 0.15 $ 0.14 $ 0.45 $ 0.42
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     110,987 81,570
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities     (6) 4
Derivative holding gains (losses)     (4,947) 4,289
Foreign currency translation adjustments     (25,742) (12,557)
Cash dividends     (31,667) (29,369)
Issuance of common stock under employee stock plans, net     12,268 16,324
Tax adjustment from stock plans     7,695 4,201
Stock-based compensation expense     8,731 8,136
Balance, end of period $ 1,406,397 $ 1,316,059 $ 1,406,397 $ 1,316,059
Cash dividends per share $ 0.15 $ 0.14 $ 0.45 $ 0.42
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     4,068 3,300
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     (572) (270)
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 $ 15,127 $ 10,476 15,127 $ 10,476
Stock Repurchased During Period, Value     $ 0