Investments, Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities		$ 208,856	$ 215,108
Equity securities		23,025	23,355
Recurring [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities		208,856	215,108
Equity securities		23,025	23,355
Cash equivalents		6,648	13,855
Assets at fair value		238,529	252,318
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities		0	0
Equity securities		17,704	17,973
Cash equivalents		6,648	13,855
Assets at fair value		24,352	31,828
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities		207,510	213,739
Equity securities	[1]	5,321	5,382
Cash equivalents		0	0
Assets at fair value		212,831	219,121
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities	[1]	1,346	1,369
Equity securities		0	0
Cash equivalents		0	0
Assets at fair value		$ 1,346	$ 1,369

[1] All underlying securities are financial service industry related.