Segments Information - Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Segments Information
Assets	$ 3,696,822	$ 3,256,431
Operating Segments
Segments Information
Assets	3,398,652	3,022,462
Corporate, Non-Segment
Segments Information
Assets	298,170	233,969
Good Sam Services and Plans | Operating Segments
Segments Information
Assets	88,092	140,825
RV and Outdoor Retail | Operating Segments
Segments Information
Assets	$ 3,310,560	$ 2,881,637