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Income Taxes (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes      
Increase (Decrease) in additional liabilities related to unrecognized tax benefits $ (900,000) $ 1,800,000  
Decrease in assets related to unrecognized tax benefits 300,000 800,000  
Increase (Decrease) in Unrecognized Tax Liabilities related to a foreign currency translation expense (200,000) 200,000  
Unrecognized Tax Liabilities 38,400,000 39,500,000  
Unrecognized Tax Assets 6,900,000 7,200,000  
Reconciliation of total amounts of unrecognized tax benefits      
Unrecognized tax benefit - opening balance 26,293,000 27,158,000 21,624,000
Gross decreases - tax positions in prior period     (275,000)
Gross increases - tax positions in current period 5,890,000 4,095,000 6,596,000
Gross decreases - tax positions in current period (64,000) (1,629,000)  
Settlements (62,000)    
Lapse of statute of limitations (6,483,000) (3,331,000) (787,000)
Unrecognized tax benefit - ending balance 25,574,000 26,293,000 27,158,000
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor 19,400,000    
Interest and penalties expense      
Interest related to unrecognized tax benefits, recorded as income tax expense (600,000) 1,400,000 800,000
Penalties related to unrecognized tax benefits, recorded as income tax expense 200,000 1,200,000 800,000
Accrued interest and penalties      
Accrued interest related to unrecognized tax benefits 6,200,000 6,800,000  
Accrued penalties related to unrecognized tax benefits $ 6,600,000 $ 6,400,000