RESTRUCTURING CHARGES - Schedule of Accrued Restructuring and Severance Costs (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		10 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018
Accrued restructuring and severance costs rollforward
Balance at beginning of period	$ 5,500	$ 6,820	$ 9,483		$ 9,483
Net accruals	3,911	5,814	9,017	$ 434	18,742	$ 3,875	$ 31,900
Non-cash adjustments	(3,338)	(2,300)	(258)
Cash paid	(4,238)	(4,834)	(11,422)
Balance at end of period	1,835	5,500	6,820		1,835		1,835
Employee compensation costs
Accrued restructuring and severance costs rollforward
Balance at beginning of period	5,500	6,820	9,483		9,483
Net accruals	400	5,814	8,779
Non-cash adjustments	173	(2,300)	(258)
Cash paid	(4,238)	(4,834)	(11,184)
Balance at end of period	1,835	5,500	6,820		1,835		1,835
Fixed Asset and Other exit costs
Accrued restructuring and severance costs rollforward
Balance at beginning of period	0	0	0		0
Net accruals	3,511	0	238
Non-cash adjustments	(3,511)	0	0
Cash paid	0	0	(238)
Balance at end of period	$ 0	$ 0	$ 0		$ 0		$ 0