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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Summary of accumulated other comprehensive income (loss), net of tax    
Balance at the beginning of the period $ (62,337) $ (73,767)
Period change 12,590 11,430
Balance at the end of the period (49,747) (62,337)
Pension Liability
   
Summary of accumulated other comprehensive income (loss), net of tax    
Balance at the beginning of the period (5,382) (3,836)
Period change (4,739) (1,546)
Balance at the end of the period (10,121) (5,382)
Net Unrealized Gains (Losses) From Marketable Securities
   
Summary of accumulated other comprehensive income (loss), net of tax    
Balance at the beginning of the period 1,757 3,102
Period change 2,431 (1,345)
Balance at the end of the period 4,188 1,757
Net Unrealized Gains (Losses) From Hedges
   
Summary of accumulated other comprehensive income (loss), net of tax    
Balance at the beginning of the period 8,663 (15,556)
Period change (24,759) 24,219
Balance at the end of the period (16,096) 8,663
Foreign Currency Translation Adjustment
   
Summary of accumulated other comprehensive income (loss), net of tax    
Balance at the beginning of the period (67,375) (57,477)
Period change 39,657 (9,898)
Balance at the end of the period $ (27,718) $ (67,375)