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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Noncontrolling Interest [Line Items]        
Balance, beginning of period     $ 1,252,864 $ 1,166,167
Net income (loss) (6,738) (7,330) 16,938 2,772
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities 3 7 4 16
Derivative holding gains (losses) (1,037) 168 (809) 1,598
Foreign currency translation adjustments 8,934 (5,517) 3,056 (18,174)
Cash dividends     (19,556) (15,081)
Issuance of common stock under employee stock plans, net     16,136 9,031
Capital contribution from non-controlling interest       8,000
Tax adjustment from stock plans     4,124 845
Stock-based compensation expense     5,208 4,282
Balance, end of period 1,277,965 1,159,456 1,277,965 1,159,456
Parent [Member]
        
Noncontrolling Interest [Line Items]        
Balance, beginning of period     1,245,418 1,166,167
Net income (loss)     15,926 3,025
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available-for-sale securities     4 16
Derivative holding gains (losses)     (809) 1,598
Foreign currency translation adjustments     3,520 (18,252)
Cash dividends     (19,556) (15,081)
Issuance of common stock under employee stock plans, net     16,136 9,031
Capital contribution from non-controlling interest       0
Tax adjustment from stock plans     4,124 845
Stock-based compensation expense     5,208 4,282
Balance, end of period 1,269,971 1,151,631 1,269,971 1,151,631
Cash dividends paid per share     $ 0.56 $ 0.44
Non-controlling Interest [Member]
        
Noncontrolling Interest [Line Items]        
Balance, beginning of period     7,446 0
Net income (loss)     1,012 (253)
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     (464) 78
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
Balance, end of period $ 7,994 $ 7,825 $ 7,994 $ 7,825