Segments Information - Other Interest Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segments Information
Other interest expense, net	$ 17,568	$ 16,794	$ 53,422	$ 45,740
Operating Segments
Segments Information
Other interest expense, net	2,450	1,362	6,862	4,183
Corporate & other
Segments Information
Other interest expense, net	15,118	15,432	46,560	41,557
Good Sam services and plans | Operating Segments
Segments Information
Other interest expense, net		1	(1)	(1)
RV and Outdoor Retail | Operating Segments
Segments Information
Other interest expense, net	$ 2,450	$ 1,361	$ 6,863	$ 4,184