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INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 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 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current income taxes: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ (2,215) | $ (3,044) | $ 16,681
State |  |  |  |  |  |  |  |  | 6,006 | 11,180 | 4,088
Total current income tax expense |  |  |  |  |  |  |  |  | 3,791 | 8,136 | 20,769
Deferred income taxes: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (25,938) | 6,699 | 4,754
State |  |  |  |  |  |  |  |  | (4,434) | (1,086) | 2,525
Total deferred income tax expense |  |  |  |  |  |  |  |  | (30,372) | 5,613 | 7,279
Change in valuation allowance |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income Tax Expense (Benefit) | $ (3,418) | $ (3,939) | $ (12,753) | $ (6,471) | $ (2,543) | $ (9,016) | $ 13,647 | $ 11,661 | $ (26,581) | $ 13,749 | $ 28,048

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