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Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2018
Goodwill
Balance (excluding impairment charges)			$ 628,778
Accumulated impairment charges			(241,837)
Balance	$ 386,941	$ 386,941
Acquisitions		108
Impairment charge	0
Balance		387,049
Good Sam Services and Plans
Goodwill
Balance (excluding impairment charges)			70,713
Accumulated impairment charges			(46,884)
Balance	23,829	23,829
Balance		23,829
RV and Outdoor Retail
Goodwill
Balance (excluding impairment charges)			558,065
Accumulated impairment charges			$ (194,953)
Balance	$ 363,112	363,112
Acquisitions		108
Balance		$ 363,220