Segment Information - Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segments Information
Capital expenditures	$ 254,359	$ 80,771	$ 56,943
Consumer services and plans | Operating Segments
Segments Information
Capital expenditures	2,741	3,358	3,136
Dealership | Operating Segments
Segments Information
Capital expenditures	91,961	43,588	42,506
Retail | Operating Segments
Segments Information
Capital expenditures	$ 159,657	$ 33,825	$ 11,301