SEGMENT REPORTING - Reconciliation of Operating Income to Consolidated Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Adjustment for:
Amortization of intangible assets			$ 9,296	$ 11,423
Impairment and other charges	$ 48,401	$ 0	48,401	0
Income (loss) from operations	(40,846)	21,717	(23,178)	59,380
Interest expense	3,752	4,986	12,059	14,911
Other (income) expense, net	320	(25)	(381)	127
Income (loss) before income taxes	(44,918)	16,756	(34,856)	44,342
Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Operating income for reportable segments	22,138	38,278	78,830	107,185
Segment Reconciling Items
Adjustment for:
Amortization of intangible assets	3,053	3,806	9,296	11,423
Impairment and other charges	48,401	0	48,401	0
Corporate
Adjustment for:
Corporate expenses	$ 11,530	$ 12,755	$ 44,311	$ 36,382