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Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 650,492	$ 498,336
OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	600,179	462,029
Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	404,957	330,274
Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	52,915	37,044
Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	142,307	94,711
Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	50,313	36,307
Chassis, chassis parts and slide-out mechanisms | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	252,702	222,949
Windows and doors | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	149,520	97,200
Furniture and mattresses | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	105,518	71,174
Axles and suspension solutions | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	33,605	32,181
Other | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	58,834	38,525
U.S.
Disaggregation of Revenue [Line Items]
Net sales	627,902	489,574
U.S. | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	580,556	455,611
U.S. | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	403,742	329,318
U.S. | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	43,406	33,762
U.S. | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	133,408	92,531
U.S. | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	47,346	33,963
International
Disaggregation of Revenue [Line Items]
Net sales	22,590	8,762
International | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	19,623	6,418
International | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	1,215	956
International | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	9,509	3,282
International | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	8,899	2,180
International | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	$ 2,967	$ 2,344

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+ References

No definition available.

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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