INCOME TAXES - Reconciliation of the Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ (9,790)	$ (2,844)	$ (16,236)	$ (6,271)
State tax expense, net of federal taxes	190	3	226	3
Valuation allowance changes affecting income tax provision	10,266	1,926	17,242	5,314
Non-deductible transaction costs and other	52	1,064	105	1,126
Total income tax expense	$ 718	$ 149	$ 1,337	$ 172