SEGMENT INFORMATION - Narrative (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019 segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Amortization of intangible assets		$ 35,908	$ 34,213	$ 19,374
Manufacturing
Segment Reporting Information [Line Items]
Amortization of intangible assets		29,457	27,413	16,200
Distribution
Segment Reporting Information [Line Items]
Amortization of intangible assets		$ 6,451	$ 6,800	$ 3,100
RV Customer 1 | Customer Concentration Risk | Accounts Receivable
Segment Reporting Information [Line Items]
Concentration risk, percentage			13.00%
RV Customer 1 | Customer Concentration Risk | Revenue, Segment Benchmark
Segment Reporting Information [Line Items]
Concentration risk, percentage		23.00%	29.00%	32.00%
RV Customer 2 | Customer Concentration Risk | Accounts Receivable
Segment Reporting Information [Line Items]
Concentration risk, percentage		14.00%	12.00%
RV Customer 2 | Customer Concentration Risk | Revenue, Segment Benchmark
Segment Reporting Information [Line Items]
Concentration risk, percentage		17.00%	20.00%	25.00%