INCOME TAXES - Schedule of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current provision for income taxes:
Federal	$ 58,785	$ 77,477	$ 113,737
State	8,061	6,625	2,273
Current income tax expense (benefit)	66,846	84,102	116,010
Deferred (benefit) provision for income taxes:
Federal	(68,802)	(196,468)	8,555
State	(33,819)	37,006	(2,437)
Deferred income tax expense (benefit)	(102,621)	(159,462)	6,118
Provision for income taxes	$ (35,775)	$ (75,360)	$ 122,128