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Income Taxes - Schedule of Expense (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  |  |  |  |  | $ 127 | $ (6,568) | $ (859) | $ 7,476
State |  |  |  |  |  |  |  |  |  |  |  |  | 77 | 60 | 215 | 1,892
Current tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 204 | (6,508) | (644) | 9,368
Deferred tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 13,907 | (6,713) | (1,183)
State |  |  |  |  |  |  |  |  |  |  |  |  | 139 | 4,214 | (2,345) | (441)
Total deferred tax expense (benefit) |  |  |  | $ 469 |  |  |  | $ (1,628) | $ 602 | $ 18,029 | $ 746 | $ 18,179 | 239 | 18,121 | (9,058) | (1,624)
Total tax expense (benefit) | $ (320) | $ 149 | $ 135 | $ 479 | $ (1,238) | $ (1,792) | $ 18,000 | $ (3,357) |  |  |  |  | $ 443 | $ 11,613 | $ (9,702) | $ 7,744

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