INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Intangible assets subject to amortization
Gross Amount	$ 98,283		$ 98,283		$ 99,443
Accumulated amortization	(37,640)		(37,640)		(33,584)
Net Book Value	60,643		60,643		65,859
Amortization expense for intangible assets	1,504	$ 1,499	4,527	$ 4,423
Estimated amortization expense
Remainder of 2021	1,500		1,500
2022	6,048		6,048
2023	6,060		6,060
2024	5,733		5,733
2025	5,715		5,715
2026	5,703		5,703
Thereafter	29,884		29,884
Total estimated amortization expense	60,643		60,643
Customer lists
Intangible assets subject to amortization
Gross Amount	69,237		69,237		69,833
Accumulated amortization	(26,558)		(26,558)		(23,636)
Net Book Value	42,679		$ 42,679		46,197
Customer lists | Minimum
Intangible assets subject to amortization
Estimated Life			8 years
Customer lists | Maximum
Intangible assets subject to amortization
Estimated Life			17 years
Trade name
Intangible assets subject to amortization
Gross Amount	13,888		$ 13,888		14,055
Accumulated amortization	(5,706)		(5,706)		(5,061)
Net Book Value	8,182		$ 8,182		8,994
Trade name | Minimum
Intangible assets subject to amortization
Estimated Life			10 years
Trade name | Maximum
Intangible assets subject to amortization
Estimated Life			19 years
Design and technologies
Intangible assets subject to amortization
Gross Amount	15,134		$ 15,134		15,531
Accumulated amortization	(5,362)		(5,362)		(4,874)
Net Book Value	9,772		$ 9,772		10,657
Design and technologies | Minimum
Intangible assets subject to amortization
Estimated Life			10 years
Design and technologies | Maximum
Intangible assets subject to amortization
Estimated Life			15 years
Patents
Intangible assets subject to amortization
Estimated Life			17 years
Gross Amount	24		$ 24		24
Accumulated amortization	(14)		(14)		(13)
Net Book Value	$ 10		$ 10		$ 11