Reinsurance - Effects of Reinsurance and Assumption Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Written premiums:
Direct	$ 20,112	$ 22,340	$ 61,731	$ 66,473
Assumed	9,469	6,157	21,305	17,143
Ceded	(11,186)	(3,863)	(19,235)	(10,755)
Net written premiums	18,395	24,634	63,801	72,861
Earned premiums:
Direct	21,797	23,057	65,817	67,871
Assumed	7,094	4,196	19,676	8,186
Ceded	(11,232)	(3,873)	(19,198)	(10,893)
Net earned premiums	17,659	23,380	66,295	65,164
Losses and LAE:
Direct	27,268	13,616	59,496	41,460
Assumed	5,313	1,750	14,017	4,106
Ceded	(6,113)	(784)	(14,638)	(4,744)
Total net incurred losses and LAE	$ 26,468	$ 14,582	$ 58,875	$ 40,822