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Segment Reporting (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 604,244	$ 554,814	$ 1,939,191	$ 1,600,633
OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	539,978	505,921	1,757,075	1,470,725
Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	338,830	357,940	1,143,251	1,045,465
Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	43,244	41,595	145,230	114,887
Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	157,904	106,386	468,594	310,373
Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	64,266	48,893	182,116	129,908
Chassis, chassis parts and slide-out mechanisms | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	214,272	228,809	714,786	687,274
Windows and doors | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	157,336	111,629	476,228	318,222
Furniture and mattresses | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	88,411	89,672	299,207	243,586
Axles and suspension solutions | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	30,148	30,542	96,901	95,082
Other | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	49,811	45,269	169,953	126,561
U.S.
Disaggregation of Revenue [Line Items]
Net sales	577,523	542,354	1,863,798	1,569,756
U.S. | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	515,787	496,010	1,690,287	1,447,441
U.S. | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	335,842	357,290	1,137,095	1,043,297
U.S. | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	32,929	35,766	113,888	102,269
U.S. | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	147,016	102,954	439,304	301,875
U.S. | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	61,736	46,344	173,511	122,315
International
Disaggregation of Revenue [Line Items]
Net sales	26,721	12,460	75,393	30,877
International | OEM Segment
Disaggregation of Revenue [Line Items]
Net sales	24,191	9,911	66,788	23,284
International | Travel trailers and fifth-wheels
Disaggregation of Revenue [Line Items]
Net sales	2,988	650	6,156	2,168
International | Motorhomes
Disaggregation of Revenue [Line Items]
Net sales	10,315	5,829	31,342	12,618
International | Adjacent industries OEMs
Disaggregation of Revenue [Line Items]
Net sales	10,888	3,432	29,290	8,498
International | Aftermarket Segment
Disaggregation of Revenue [Line Items]
Net sales	$ 2,530	$ 2,549	$ 8,605	$ 7,593

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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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