DISCONTINUED OPERATIONS - Net Gain on Disposal of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset sales		$ 174,333	$ 0
Net gain (loss) on disposal	$ 1,260	(21,760)
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from asset sales	0	186,612
Book value of asset sales	(4)	180,978
Gain on assets sold	4	5,634
Transaction cost (recovery) expenses	(386)	8,791
Compensation expense related to the transactions	596	4,388
Facility and IT related cost (recovery) expenses	(1,466)	14,215
Total cost (recovery) expenses	(1,256)	27,394
Net gain (loss) on disposal	$ 1,260	$ (21,760)