CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended				9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019		Mar. 19, 2019		Sep. 30, 2019		Sep. 30, 2019		Sep. 30, 2020
BALANCE	$ 460,614	$ 642,429		$ (127,583)		$ 199,006		$ 640,469	[1]	$ 646,368
Total other comprehensive loss, net of tax	482	60		(165)		(331)				(6,506)
BALANCE	439,759	646,284		199,006		646,284		646,284		439,759
Foreign Currency Translation Adjustments [Member]
BALANCE				(649)	[2]	(814)	[2]			(183)
Other comprehensive (loss) income before reclassifications				(165)	[2]			(384)	[3]	(215)
Total other comprehensive loss, net of tax				(165)	[2]			(384)	[3]	(215)
BALANCE	(398)	(384)	[3]	(814)	[2]	(384)	[3]	(384)	[3]	(398)
Accumulated Other Comprehensive Loss [Member]
BALANCE	(6,269)	(391)		(649)		(814)				719
Other comprehensive (loss) income before reclassifications								(296)	[2]	(7,394)
Amounts reclassified from accumulated other comprehensive loss								(35)	[2]	888
Total other comprehensive loss, net of tax								(331)	[2]	(6,506)
BALANCE	(5,787)	(331)	[2]	$ (814)		(331)	[2]	(331)	[2]	(5,787)
Changes Related to Cash Flow Derivative Hedge [Member]
BALANCE										902
Other comprehensive (loss) income before reclassifications								88		(7,179)
Amounts reclassified from accumulated other comprehensive loss								(35)		888
Total other comprehensive loss, net of tax								53		(6,291)
BALANCE	$ (5,389)	$ 53				$ 53		$ 53		$ (5,389)

[1] Initial equity balances of the Successor reflect the equity of the accounting acquirer, Haymaker, and the issuance of common stock, warrants and cash contributed by Haymaker in connection with the acquisition of OSW Predecessor

[2] For the period from January 1, 2019 to March 19, 2019 (Predecessor), the only component of other comprehensive income (loss) was foreign currency translation adjustments.

[3] See Note 13 – “Fair Value Measurements and Derivatives”.