Segments Information - Other Interest Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segments Information
Other interest expense, net	$ 18,211	$ 16,107	$ 35,854	$ 28,946
Operating Segments
Segments Information
Other interest expense, net	2,264	1,003	4,412	2,821
Corporate & other
Segments Information
Other interest expense, net	15,947	15,104	31,442	26,125
Good Sam services and plans | Operating Segments
Segments Information
Other interest expense, net	(1)	(1)	(1)	(2)
RV and Outdoor Retail | Operating Segments
Segments Information
Other interest expense, net	$ 2,265	$ 1,004	$ 4,413	$ 2,823