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ACQUISITION OF SUPREME INDUSTRIES, INC. - Narrative (Details) - USD ($)		12 Months Ended
	Sep. 27, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 26, 2017
Business Acquisition [Line Items]
Acquisition expenses		$ 68,000	$ 9,605,000	$ 0
Goodwill		311,084,000	317,464,000	$ 148,367,000
Goodwill, period increase (decrease)		(1,500,000)
Senior Notes
Business Acquisition [Line Items]
Debt instrument, face amount	$ 325,000,000				$ 325,000,000
Notes issued, interest rate	5.50%				5.50%
Supreme Industries Inc.
Business Acquisition [Line Items]
Business acquisition, share price (in usd per share)	$ 21
Intangible assets	$ 161,200,000
Goodwill	167,714,000
Revenues		347,300,000	67,100,000
Net income (loss), including portion attributable to noncontrolling interest		$ 13,300,000	$ (1,600,000)
Supreme Industries Inc. | Class A and Class B
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 360,400,000

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