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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income taxes disclosures          
Income (loss) before income taxes $ (23,674)   $ (68,462) $ (64,146) $ (114,535)
Income tax expense (benefit) (1,790)   $ 1,136 (24,969) $ 2,677
Federal          
Income taxes disclosures          
Income tax expense (benefit) (2,200)     (21,600)  
Tax reconciliation disclosures          
Current income tax expense (benefit) for net income (losses) (2,200)     (23,500)  
Deferred income tax expense related to amortization on indefinite-lived intangible assets       1,900  
Foreign          
Income taxes disclosures          
Income tax expense (benefit) 400     (3,400)  
Tax reconciliation disclosures          
Current foreign income tax expense (benefit) for net income (losses) $ 400     $ 3,100  
Increase (decrease) in unrecognized tax benefits   $ (6,300)      
Reversal of tax liability related to uncertain tax position   (4,900)      
Deferred tax benefit related to foreign net operating losses   $ (1,400)