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Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2018
Goodwill
Balance (excluding impairment charges)			$ 628,778
Accumulated impairment charges			(241,837)
Balance	$ 386,941
Acquisitions	4
Impairment charge		$ 0
Balance	386,945
Good Sam Services and Plans
Goodwill
Balance (excluding impairment charges)			70,713
Accumulated impairment charges			(46,884)
Balance	23,829
Balance	23,829
RV and Outdoor Retail
Goodwill
Balance (excluding impairment charges)			558,065
Accumulated impairment charges			$ (194,953)
Balance	363,112
Acquisitions	4
Balance	$ 363,116