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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