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Income Taxes (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes      
Increase (decrease) in additional liabilities related to unrecognized tax liabilities $ 4,100,000 $ (5,600,000)  
Increase (decrease) in assets related to unrecognized tax assets 1,800,000 (1,700,000)  
Decrease in Unrecognized Tax Liabilities related to a foreign currency translation expense (100,000) (100,000)  
Unrecognized Tax Liabilities 36,200,000 33,000,000  
Unrecognized Tax Assets 6,900,000 5,100,000  
Reconciliation of total amounts of unrecognized income tax benefits      
Unrecognized tax benefit - opening balance 22,394,000 25,574,000 26,293,000
Gross increases - tax positions in prior period 2,559,000    
Gross decreases - tax positions in prior period (39,000) (7,659,000)  
Gross increases - tax positions in current period 4,999,000 5,730,000 5,890,000
Gross decreases - tax positions in current period     (64,000)
Settlements     (62,000)
Lapse of statute of limitations (3,426,000) (1,251,000) (6,483,000)
Unrecognized tax benefit - ending balance 26,487,000 22,394,000 25,574,000
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor 20,100,000    
Expected reduction in effective income tax rate if uncertain tax positions are settled by the taxing authorities in the entity's favor (as a percent) 8.20%    
Interest and penalties expense      
Interest related to unrecognized tax benefits, recorded as (income) expense (600,000) (700,000) (600,000)
Penalties related to unrecognized tax benefits, recorded as income tax (income) expense (300,000) (1,500,000) 200,000
Accrued interest and penalties      
Accrued interest related to unrecognized tax benefits 4,900,000 5,500,000  
Accrued penalties related to unrecognized tax benefits $ 4,800,000 $ 5,100,000