INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 07, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Intangible assets subject to amortization
Gross Amount		$ 98,076		$ 98,076		$ 89,487
Accumulated amortization		(31,710)		(31,710)		(26,990)
Net Book Value		66,366		66,366		62,497
Amortization expense for intangible assets		1,499	$ 1,429	4,423	$ 4,291
Estimated amortization expense
Remainder of 2020		1,499		1,499
2021		5,984		5,984
2022		6,031		6,031
2023		6,040		6,040
2024		5,713		5,713
Thereafter		41,099		41,099
Total estimated amortization expense		66,366		66,366
Dynamic Controls
Intangible assets subject to amortization
Intangible assets	$ 7,800	7,800		7,800
Customer lists
Intangible assets subject to amortization
Gross Amount		69,112		69,112		64,314
Accumulated amortization		(22,462)		(22,462)		(19,311)
Net Book Value		46,650		46,650		45,003
Customer lists | Dynamic Controls
Intangible assets subject to amortization
Estimated Life	16 years
Intangible assets		4,400		$ 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		13,837		$ 13,837		12,222
Accumulated amortization		(4,799)		(4,799)		(4,114)
Net Book Value		9,038		9,038		8,108
Trade name | Dynamic Controls
Intangible assets subject to amortization
Estimated Life	18 years
Intangible assets		1,500		$ 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		15,103		$ 15,103		12,927
Accumulated amortization		(4,437)		(4,437)		(3,554)
Net Book Value		10,666		$ 10,666		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		24
Accumulated amortization		(12)		(12)		(11)
Net Book Value		$ 12		$ 12		$ 13