Segment Reporting (Narrative) (Details) - segment	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information
Number of reportable segments	2
Net sales \| OEM Segment
Segment Reporting Information
Concentration risk, percentage	82.00%	81.00%
Net sales \| Aftermarket Segment
Segment Reporting Information
Concentration risk, percentage	18.00%	19.00%
Product Concentration Risk \| Net sales \| Travel trailers and fifth-wheels
Segment Reporting Information
Concentration risk, percentage	62.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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