DISCONTINUED OPERATIONS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of CBR business	$ 0	$ 87,076	$ 0
Transaction expenses	$ 0	14,111	0
Discontinued Operations, Held-for-sale or Disposed of by Sale | CBR business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures		1,600	4,900
Depreciation and amortization expense		8,400	21,700
Gain on sale of CBR business		87,076	$ 0
Transaction expenses		$ 14,100