INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 212,819	$ 214,095
Accumulated Amortization	(132,865)	(124,197)
Net Carrying Amount	79,954	89,898
Gross Carrying Amount, discontinued operations	(19,468)	(20,186)
Accumulated Amortization, discontinued operations	18,094	18,606
Net Carrying Amount, discontinued operations	(1,374)	(1,580)
Continuing Operations
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	193,351	193,909
Accumulated Amortization	(114,771)	(105,591)
Net Carrying Amount	78,580	88,318
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	174,400	175,156
Accumulated Amortization	(97,362)	(88,783)
Net Carrying Amount	77,038	86,373
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,288	5,503
Accumulated Amortization	(5,288)	(5,503)
Net Carrying Amount	0	0
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,520	24,743
Accumulated Amortization	(22,417)	(22,252)
Net Carrying Amount	2,103	2,491
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,784	7,843
Accumulated Amortization	(6,998)	(6,885)
Net Carrying Amount	786	958
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	827	850
Accumulated Amortization	(800)	(774)
Net Carrying Amount	$ 27	$ 76