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Income Taxes (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]          
Provision for income taxes $ 6,304,000 $ 3,865,000 $ 15,558,000 $ 11,552,000  
Payment of withholding taxes to foreign tax authorities 5,800,000 3,700,000 13,400,000 11,800,000  
Unrecognized tax benefits 16,800,000   16,800,000   16,800,000
Unrecognized tax benefits, reduction of long-term deferred tax assets 10,600,000   10,600,000   10,600,000
Unrecognized tax benefits included in long-term income taxes payable 6,200,000   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   $ 2,000,000