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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Current | $ 0 | $ 0 | $ 0 | $ 0 |
Deferred | (437) | (514) | 3,047 | (1,831) |
Income tax (expense) benefit | (437) | $ (514) | 3,047 | $ (1,831) |
Net deferred tax assets | $ 47,833 |  | $ 47,833 |  | $ 38,301

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