INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Assets:
Net operating loss	$ 2,870	$ 42,280
Contingent consideration	21,575
Other accrued expenses	3,160
Stock based compensation	9,484
Other	0	1,427
Deferred tax assets	37,089	43,707
Deferred Tax Liabilities:
Intangible assets	(25,124)	(7,830)
Deferred gain on installment sale	(29,095)
Tax basis depreciation less than book depreciation	(218)
Deferred tax liabilities	(54,437)	(7,830)
Net deferred tax assets before valuation allowance	(17,348)	35,877
Valuation allowance	(6,980)	(36,018)
Total deferred tax liability	$ (24,328)	$ (141)