Segment Reporting (Schedule of Net Sales by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information
Total net sales	$ 402,899	$ 412,370	$ 440,831	$ 422,798	$ 334,228	$ 345,296	$ 362,085	$ 361,457	$ 1,678,898	$ 1,403,066	$ 1,190,782
OEM Segment
Segment Reporting Information
Total net sales									1,548,091	1,300,060	1,127,026
Travel Trailer and Fifth Wheels
Segment Reporting Information
Total net sales									1,099,882	938,787	841,497
Motorhomes
Segment Reporting Information
Total net sales									116,191	86,513	70,332
OEMs Adjacent Industries
Segment Reporting Information
Total net sales									332,018	274,760	215,197
Aftermarket Segment
Segment Reporting Information
Total net sales									$ 130,807	$ 103,006	$ 63,756