Revenue from Contracts with Customers Disaggregates revenues from contracts with customer by revenue type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Service fee and commission income	$ 12,904	$ 9,871	$ 34,491	$ 28,382
Extended Warranty | IWS | Vehicle service agreement fees
Disaggregation of Revenue [Line Items]
Service fee and commission income	4,495	4,410	13,525	13,025
Extended Warranty | IWS | GAP commissions
Disaggregation of Revenue [Line Items]
Service fee and commission income	261	200	745	592
Extended Warranty | Trinity | Maintenance support service fees
Disaggregation of Revenue [Line Items]
Service fee and commission income	2,451	2,720	6,151	7,655
Extended Warranty | Trinity | Warranty product commissions
Disaggregation of Revenue [Line Items]
Service fee and commission income	791	739	2,190	1,971
Extended Warranty | PWSC | Homebuilder warranty service fees
Disaggregation of Revenue [Line Items]
Service fee and commission income	1,547	1,599	4,445	4,574
Extended Warranty | PWSC | Homebuilder warranty commissions
Disaggregation of Revenue [Line Items]
Service fee and commission income	227	203	636	565
Extended Warranty | Geminus | Vehicle service agreement fees
Disaggregation of Revenue [Line Items]
Service fee and commission income	3,116	0	6,760	0
Extended Warranty | Geminus | GAP commissions
Disaggregation of Revenue [Line Items]
Service fee and commission income	$ 16	$ 0	$ 39	$ 0