Deferred Policy Acquisition Costs - Activity in Deferred Policy Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at beginning of period	$ 12,011	$ 12,781
Deferred policy acquisition costs	5,731	5,782
Amortization of policy acquisition costs	(5,589)	(6,513)
Net change	142	(731)
Balance at end of period	$ 12,153	$ 12,050