Revenue from Contracts with Customers Disaggregate revenue from contracts with customers by revenue type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Service fee and commission income	$ 38,286	$ 30,530
Insurance Commissions	3,756	3,086
Insurance Services Revenue	9,911	8,763
Vehicle service agreement fees [Member]
Revenue from External Customer [Line Items]
Service fee and commission income	17,796	16,791
GAP commissions [Member]
Revenue from External Customer [Line Items]
Service fee and commission income	748	679
Warranty product commissions [Member]
Revenue from External Customer [Line Items]
Service fee and commission income	2,526	1,810
Insurance Commissions	973	354
Homebuilder warranty service fees [Member]
Revenue from External Customer [Line Items]
Service fee and commission income	6,332	2,133
Reportable Subsegments [Member]
Revenue from External Customer [Line Items]
Service fee and commission income	$ 38,286	$ 30,530