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Income Taxes (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Income Taxes      
Provision for income taxes $ 3,850,000 $ 6,776,000  
Payment of withholding taxes to foreign tax authorities 4,400,000    
Net deferred tax assets, before valuation allowance 149,300,000    
Unrecognized tax benefits 16,000,000   16,600,000
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit 7,000,000   7,000,000
Unrecognized tax benefits included in long-term income taxes payable 9,000,000   9,600,000
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit $ 2,200,000