Segments Information - Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segments Information
Assets	$ 3,256,431	$ 3,376,240	$ 2,806,687
Operating Segments
Segments Information
Assets	3,022,462	3,186,012	2,613,531
Corporate, Non-Segment
Segments Information
Assets	233,969	190,228	193,156
RV and Outdoor Retail | Operating Segments
Segments Information
Assets	2,881,637	3,047,652	2,467,519
Consumer Services and Plans | Operating Segments
Segments Information
Assets	$ 140,825	$ 138,360	$ 146,012