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 $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Noncontrolling Interest [Line Items]        
Balance, beginning of period     $ 1,252,864 $ 1,166,167
Net income 67,932 54,550 84,870 57,322
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities 0 (9) 4 7
Derivative holding gains (losses) 5,098 (3,204) 4,289 (1,606)
Foreign currency translation adjustments (15,883) 11,114 (12,827) (7,060)
Cash dividends     (29,369) (22,665)
Issuance of common stock under employee stock plans, net     16,324 12,055
Capital contribution from non-controlling interest       8,000
Tax adjustment from stock plans     4,201 970
Stock-based compensation expense     8,136 6,532
Repurchase of common stock     (1,957)  
Balance, end of period 1,326,535 1,219,722 1,326,535 1,219,722
Cash dividends per share $ 0.14 $ 0.11 $ 0.42 $ 0.33
Parent [Member]
       
Noncontrolling Interest [Line Items]        
Balance, beginning of period     1,245,418 1,166,167
Net income     81,570 57,611
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities     4 7
Derivative holding gains (losses)     4,289 (1,606)
Foreign currency translation adjustments     (12,557) (7,159)
Cash dividends     (29,369) (22,665)
Issuance of common stock under employee stock plans, net     16,324 12,055
Capital contribution from non-controlling interest       0
Tax adjustment from stock plans     4,201 970
Stock-based compensation expense     8,136 6,532
Repurchase of common stock     (1,957)  
Balance, end of period 1,316,059 1,211,912 1,316,059 1,211,912
Cash dividends per share     $ 0.42 $ 0.33
Non-controlling Interest [Member]
       
Noncontrolling Interest [Line Items]        
Balance, beginning of period     7,446 0
Net income     3,300 (289)
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     (270) 99
Cash dividends     0 0
Issuance of common stock under employee stock plans, net     0 0
Capital contribution from non-controlling interest       8,000
Tax adjustment from stock plans     0 0
Stock-based compensation expense     0 0
Repurchase of common stock     0  
Balance, end of period $ 10,476 $ 7,810 $ 10,476 $ 7,810