INCOME TAXES - PROVISION (BENEFIT) AND RECONCILIATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 1,087	$ (1,679)	$ (2,853)
State	140	160	11
Total current	1,227	(1,519)	(2,842)
Deferred:
Federal	16,291	(39,459)	80,293
State	6,700	(6,521)	3,895
Total deferred	22,991	(45,980)	84,188
Total (benefit) provision for income taxes	(24,218)	47,499	(81,346)
Reconciliation of income taxes at the statutory federal income tax rate to the actual tax rate
Tax at federal statutory rate	(22,580)	(43,133)	74,588
State tax, net of federal benefit	(748)	(2,615)	3,903
Research credit	(902)	(438)
Stock Based Compensation	1,435	848	366
Non deductible meals and entertainment	955	729	440
Non-deductible other expense	1,426	846	2,049
Change in valuation allowance	44,632	(3,736)
Total provision for income taxes	$ 24,218	$ (47,499)	$ 81,346