Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Loss) (Details)

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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Stockholders’ (deficit) equity $ (1,816,921) $ (1,523,874) $ (792,015)   $ (166,491)
Foreign currency translation adjustment, net of tax (28,613) 18,546 363    
Foreign currency translation adjustment, tax 9,451        
Accumulated other comprehensive (loss) income, net of tax (6,193) 18,407   $ 22,420  
Adjustments Due to ASU 2018-02          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive (loss) income, net of tax       $ 4,013  
Accumulated Other Comprehensive Income (Loss)          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Stockholders’ (deficit) equity $ (6,193) $ 18,407 $ (139)   $ (502)