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INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current income taxes: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 27,555 | $ 11,070 | $ 400
State |  |  |  |  |  |  |  |  | 7,360 | 2,348 | 19
Total current income tax expense |  |  |  |  |  |  |  |  | 34,915 | 13,418 | 419
Deferred income taxes: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 4,754 | (235) | 2,646
State |  |  |  |  |  |  |  |  | 2,525 | 762 | 858
Total deferred income tax expense |  |  |  |  |  |  |  |  | 7,279 | 527 | 3,504
Change in valuation allowance |  |  |  |  |  |  |  |  | 0 | (17,684) | 4,069
Income Tax Expense (Benefit) | $ 11,928 | $ 9,263 | $ 11,479 | $ 9,524 | $ (5,269) | $ 903 | $ 436 | $ 191 | $ 42,194 | $ (3,739) | $ 7,992

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