Segments Information - Segment Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segments Information
Total segment income	$ 90,304	$ 117,705	$ 107,186	$ 163,376
Selling, general, and administrative expense	(303,366)	(283,095)	(571,431)	(529,408)
Depreciation and amortization	(13,946)	(11,628)	(27,540)	(21,028)
Other interest expense, net	(18,211)	(16,107)	(35,854)	(28,946)
Tax Receivable Agreement liability adjustment			8,477
Loss and expense on debt restructure		44		(2,056)
Other expense, net		(2)		(2)
Income before income taxes	60,824	91,394	56,930	111,807
Operating Segments
Segments Information
Total segment income	96,895	120,566	118,934	166,802
Depreciation and amortization	(13,946)	(11,628)	(27,540)	(21,028)
Other interest expense, net	(2,264)	(1,003)	(4,412)	(2,821)
Corporate & other
Segments Information
Selling, general, and administrative expense	(3,914)	(1,479)	(7,087)	(2,963)
Other interest expense, net	(15,947)	(15,104)	(31,442)	(26,125)
Good Sam services and plans | Operating Segments
Segments Information
Total segment income	21,208	20,721	43,622	42,438
Depreciation and amortization	(836)	(774)	(1,688)	(1,505)
Other interest expense, net	1	1	1	2
RV and Outdoor Retail | Operating Segments
Segments Information
Total segment income	75,687	99,845	75,312	124,364
Depreciation and amortization	(13,110)	(10,854)	(25,852)	(19,523)
Other interest expense, net	$ (2,265)	$ (1,004)	$ (4,413)	$ (2,823)