Unpaid Loss and Loss Adjustment Expenses Vehicle Service Agreements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items]
Vehicle service agreements	$ 2,773	$ 2,975	$ 2,915
Other Insurance Product Line [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Current year	1,219	1,367
Prior years	0	0
Current year	1,225	1,233
Prior years	$ (136)	$ (134)
Vehicle service agreements			$ 2,915	$ 2,975