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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Valuation Allowance [Line Items]          
Provision for (benefit from) income taxes $ (166,971) $ 5,347 $ (155,727) $ 17,214  
Payment of withholding taxes to foreign tax authorities 5,400 $ 4,800 15,000 $ 14,600  
Deferred Tax Assets, Gross 182,700   182,700    
Change in valuation allowance (174,400)        
Deferred Tax Assets, Valuation Allowance 20,900   20,900    
Unrecognized tax benefits 20,700   20,700   $ 19,900
Unrecognized tax benefits, reduction of long-term deferred tax assets 18,500   18,500   17,800
Unrecognized tax benefits included in long-term income taxes payable 2,200   2,200   $ 2,100
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit $ 2,200   $ 2,200