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, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Noncontrolling Interest [Line Items]        
Balance, beginning of period     $ 1,166,167  
Net income (loss) 54,550 64,375 57,322 60,372
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available for sale securities (9) 32 7 0
Derivative holding losses (3,204) (3,369) (1,606) (3,952)
Foreign currency translation adjustments 11,114 8,306 (7,060) 4,602
Cash dividends     (22,665)  
Issuance of common stock under employee stock plans, net     12,055  
Capital contribution from non-controlling interest     8,000  
Tax adjustment from stock plans     970  
Stock-based compensation expense     6,532  
Balance, end of period 1,219,722 1,127,703 1,219,722 1,127,703
Parent [Member]
       
Noncontrolling Interest [Line Items]        
Balance, beginning of period     1,166,167  
Net income (loss)     57,611  
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available for sale securities     7  
Derivative holding losses     (1,606)  
Foreign currency translation adjustments     (7,159)  
Cash dividends     (22,665)  
Issuance of common stock under employee stock plans, net     12,055  
Capital contribution from non-controlling interest     0  
Tax adjustment from stock plans     970  
Stock-based compensation expense     6,532  
Balance, end of period 1,211,912   1,211,912  
Non-controlling Interest [Member]
       
Noncontrolling Interest [Line Items]        
Balance, beginning of period     0  
Net income (loss)     (289)  
Other comprehensive income (loss):        
Unrealized holding gains (losses) on available for sale securities     0  
Derivative holding losses     0  
Foreign currency translation adjustments     99  
Cash dividends     0  
Issuance of common stock under employee stock plans, net     0  
Capital contribution from non-controlling interest     8,000  
Tax adjustment from stock plans     0  
Stock-based compensation expense     0  
Balance, end of period $ 7,810   $ 7,810