Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	$ 69	$ 20	$ 691	$ 585
Gross realized losses	(51)	(467)	(505)	(1,259)
Net realized gains (losses)	18	(447)	186	(674)
Fair Value at Sale
Fair value at sale	37,065	5,275	133,749	13,338
Fair value at sale	2,057	46,655	38,859	116,974
Net fair value at sale	39,122	51,930	172,608	130,312
Fixed Maturities
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	66	12	597	68
Gross realized losses	(48)	(441)	(287)	(1,233)
Fair Value at Sale
Fair value at sale	34,282	4,864	129,364	11,745
Fair value at sale	2,033	46,268	36,661	116,587
Equity Securities
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	3	8	94	517
Gross realized losses	(3)	(26)	(217)	(26)
Fair Value at Sale
Fair value at sale	272	411	814	1,593
Fair value at sale	14	387	1,163	387
Short-term Investments
Fair Value at Sale
Gross realized losses	0		(1)	0
Fair value at sale	10	0	1,035	0
Gross realized gains	0	0	0	0
Fair value at sale	$ 2,511	$ 0	$ 3,571	$ 0