Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	$ 20	$ 124	$ 585	$ 271
Gross realized losses	(467)	(195)	(1,259)	(825)
Net realized gains (losses)	(447)	(71)	(674)	(554)
Fair Value at Sale
Fair value at sale	5,275	11,524	13,338	30,439
Fair value at sale	46,655	10,517	116,974	48,013
Net fair value at sale	51,930	22,041	130,312	78,452
Fixed Maturities
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	12	123	68	263
Gross realized losses	(441)	(195)	(1,233)	(815)
Fair Value at Sale
Fair value at sale	4,864	11,368	11,745	30,264
Fair value at sale	46,268	10,517	116,587	47,913
Equity Securities
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	8	1	517	8
Gross realized losses	(26)	0	(26)	(10)
Fair Value at Sale
Fair value at sale	411	156	1,593	175
Fair value at sale	$ 387	$ 0	$ 387	$ 100