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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]          
Provision for income taxes $ 5,805 $ 6,395 $ 11,244 $ 11,867  
Payment of withholding taxes to foreign tax authorities 4,800 $ 4,800 9,600 $ 9,800  
Deferred Tax Assets, Gross 186,500   186,500    
Unrecognized tax benefits 20,600   20,600   $ 19,900
Unrecognized tax benefits, reduction of long-term deferred tax assets 18,400   18,400   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