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Income Taxes (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Tax Expense (Benefit) [Abstract]          
Provision for income taxes $ 3,865,000 $ 4,080,000 $ 11,552,000 $ 12,944,000  
Payment of withholding taxes to foreign tax authorities 3,700,000 4,100,000 11,800,000 12,300,000  
Net deferred tax assets, before valuation allowance 195,900,000   195,900,000   149,300,000
Unrecognized tax benefits 17,200,000   17,200,000   16,600,000
Unrecognized tax benefits, reduction of long-term deferred tax assets, before federal tax benefit 8,000,000   8,000,000   7,000,000
Unrecognized tax benefits included in long-term income taxes payable 9,200,000   9,200,000   9,600,000
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit $ 2,200,000   $ 2,200,000