INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 07, 2020
Intangible assets subject to amortization
Gross Amount	$ 99,443	$ 89,487
Accumulated amortization	(33,584)	(26,990)
Net Book Value	65,859	62,497
Amortization expense for intangible assets	5,928	5,718	$ 3,655
Estimated amortization expense
2021	6,059
2022	6,110
2023	6,127
2024	5,798
2025	5,780
Thereafter	35,985
Total estimated amortization expense	65,859
Dynamic Controls
Intangible assets subject to amortization
Intangible assets	7,800			$ 7,800
Customer lists
Intangible assets subject to amortization
Gross Amount	69,833	64,314
Accumulated amortization	(23,636)	(19,311)
Net Book Value	$ 46,197	45,003
Customer lists | Dynamic Controls
Intangible assets subject to amortization
Estimated Life	16 years
Intangible assets	$ 4,400
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	$ 14,055	12,222
Accumulated amortization	(5,061)	(4,114)
Net Book Value	$ 8,994	8,108
Trade name | Dynamic Controls
Intangible assets subject to amortization
Estimated Life	18 years
Intangible assets	$ 1,500
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	$ 15,531	12,927
Accumulated amortization	(4,874)	(3,554)
Net Book Value	$ 10,657	9,373
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
Accumulated amortization	(13)	(11)
Net Book Value	$ 11	$ 13