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Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Deferred tax assets $ 257,231 $ 230,838
Valuation allowance (138,044) (68,104)
Deferred tax liabilities (133,383) (114,504)
Net deferred taxes $ (14,196)  
Net deferred taxes   $ 48,230