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Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Deferred tax assets $ 210,250 $ 257,231
Valuation allowance (133,504) (138,044)
Deferred tax liabilities (85,825) (133,383)
Net deferred taxes $ (9,079) $ (14,196)