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Income Taxes - Impact of Tax Cuts and Jobs Act (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Income Tax Disclosure [Abstract] |
Rate change - decrease in net deferred tax assets | $ 108,070
Rate change - decrease in valuation allowance | (172,235)
Impact on net operating loss usage | (50,551)
Reduction of deferred tax asset - AMT credits | 2,361
Total impact of the Tax Act on the Company's deferred taxes position | (112,355)
Realization of AMT credits | (2,361)
Total | $ (114,716)

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