Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt and Equity Securities, Gain (Loss)
Gross realized gains	$ 1,186	$ 368	$ 1,543	$ 622
Gross realized losses	(1,127)	(381)	(1,552)	(454)
Net realized gains (losses)	59	(13)	(9)	168
Fair Value at Sale
Fair value at sale	36,958	90,621	96,498	96,684
Fair value at sale	4,638	26,830	10,237	36,801
Net fair value at sale	41,596	117,451	106,735	133,485
Fixed Maturities
Debt and Equity Securities, Gain (Loss)
Gross realized gains	372	283	717	531
Gross realized losses	(57)	(203)	(394)	(239)
Fair Value at Sale
Fair value at sale	33,231	89,078	92,456	95,082
Fair value at sale	2,221	25,039	6,739	34,628
Equity Securities
Debt and Equity Securities, Gain (Loss)
Gross realized gains	814	85	826	91
Gross realized losses	(1,070)	(177)	(1,158)	(214)
Fair Value at Sale
Fair value at sale	3,691	483	3,971	542
Fair value at sale	2,417	766	3,370	1,148
Short-term Investments
Debt and Equity Securities, Gain (Loss)
Gross realized gains	0	0	0	0
Gross realized losses	0	(1)	0	(1)
Fair Value at Sale
Fair value at sale	36	1,060	71	1,060
Fair value at sale	$ 0	$ 1,025	$ 128	$ 1,025