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Pension Benefits (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Change in benefit obligation:      
Beginning balance $ 120,723 $ 114,256  
Service cost 8,829 8,345 9,753
Interest cost 5,167 5,148 4,548
Contributions by plan participants 739 579  
Actuarial loss 9,408 730  
Benefits paid (4,395) (7,333)  
Settlements and curtailments   (4,937)  
Foreign currency exchange rate changes (3,299) 3,635  
Other   300  
Ending balance 137,172 120,723 114,256
Change in fair value of plan assets:      
Beginning balance 102,085 95,495  
Actual return on plan assets 2,931 125  
Contributions by the employer 12,061 11,649  
Contributions by plan participants 739 579  
Ending balance 110,698 102,085 95,495
Benefits paid (4,339) (7,259)  
Settlements and curtailments   (1,314)  
Foreign currency exchange rate changes (2,357) 3,110  
Other (422) (300)  
Funded status deficiency (26,474) (18,638)  
Amounts recognized in the balance sheets:      
Other long-term liabilities 26,474 18,638  
Accumulated other comprehensive (loss) income:      
Net actuarial losses $ (19,929) $ (18,279)