Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	$ 368	$ 73	$ 622	$ 565
Gross realized losses	(381)	(511)	(454)	(792)
Net realized gains (losses)	(13)	(438)	168	(227)
Fair Value at Sale
Fair value at sale	272,161	4,913	278,224	8,063
Fair value at sale	269,329	38,091	279,301	70,319
Net fair value at sale	541,490	43,004	557,525	78,382
Fixed Maturities
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	283	14	531	56
Gross realized losses	(212)	(511)	(248)	(792)
Fair Value at Sale
Fair value at sale	270,807	4,706	276,811	6,881
Fair value at sale	268,002	38,091	277,591	70,319
Equity Securities
Debt and Equity Securities, Gain (Loss) [Abstract]
Gross realized gains	85	59	91	509
Gross realized losses	(169)	0	(206)	0
Fair Value at Sale
Fair value at sale	1,354	207	1,413	1,182
Fair value at sale	$ 1,327	$ 0	$ 1,710	$ 0