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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