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Income Taxes (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]      
Provision for income taxes $ 4,511,000 $ 3,850,000  
Payment of withholding taxes to foreign tax authorities 3,800,000 4,400,000  
Net deferred tax assets, before valuation allowance 211,000,000    
Unrecognized tax benefits 16,800,000   16,800,000
Unrecognized tax benefits, reduction of long-term deferred tax assets 10,600,000   10,600,000
Unrecognized tax benefits included in long-term income taxes payable 6,200,000   6,200,000
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit $ 2,000,000