INCOME TAXES - Components of the Provision for income taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Expense (Benefit)
Current tax benefit	$ (6)
Deferred tax expense (benefit)	78,312	$ (132,063)
Total income tax expense (benefits)	$ 78,306	$ (132,063)
Combined federal and state effective income tax rate	37.40%	36.30%