INCOME TAXES - PROVISION (BENEFIT) AND RECONCILIATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal		$ 384	$ 1,087	$ (1,679)
State		(1,813)	140	160
Total current		(1,429)	1,227	(1,519)
Deferred:
Federal			16,291	(39,459)
State			6,700	(6,521)
Total deferred			22,991	(45,980)
Total (benefit) provision for income taxes		1,429	(24,218)	47,499
Reconciliation of income taxes at the statutory federal income tax rate to the actual tax rate
Tax at federal statutory rate		(36,374)	(22,580)	(43,133)
State tax, net of federal benefit		71	(748)	(2,615)
Research credit		(41)	(902)	(438)
Stock Based Compensation		159	1,435	848
Non deductible meals and entertainment		973	955	729
Non-deductible other expense		6,508	1,426	846
Uncertain tax provisions		(1,611)
Tax Rate Changes		27,560
Change in valuation allowance		1,326	44,632	(3,736)
Total provision for income taxes		$ (1,429)	$ 24,218	$ (47,499)
Federal statutory rate (as a percent)		35.00%
One-time reduction in federal and state deferred tax assets		$ 25,500
Forecast
Reconciliation of income taxes at the statutory federal income tax rate to the actual tax rate
Federal statutory rate (as a percent)	21.00%