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Segment Reporting (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Segment Reporting Information      
Number of reportable segments | segment 2    
Int'l      
Segment Reporting Information      
Long-lived assets | $ $ 306.8 $ 160.1  
Aftermarket Segment | Net sales      
Segment Reporting Information      
Consolidated risk, percentage 22.00% 12.00% 9.00%
OEM Segment | Net sales      
Segment Reporting Information      
Consolidated risk, percentage 78.00% 88.00% 91.00%
Product Concentration Risk | Travel Trailer and Fifth Wheels | Net sales      
Segment Reporting Information      
Consolidated risk, percentage 61.00% 61.00% 64.00%