Investments, Fair Value Measured on a Recurring Basis (Details) - Recurring [Member] - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		$ 243,591	$ 252,318
Fixed Maturities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		217,848	215,108
Equity Securities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		18,936	23,355
Cash Equivalents [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		6,807	13,855
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		20,464	31,828
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Maturities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		13,657	17,973
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash Equivalents [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		6,807	13,855
Significant Other Observable Inputs (Level 2) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		221,788	219,121
Significant Other Observable Inputs (Level 2) [Member] | Fixed Maturities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		216,509	213,739
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value	[1]	5,279	5,382
Significant Other Observable Inputs (Level 2) [Member] | Cash Equivalents [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		0	0
Significant Unobservable Inputs (Level 3) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		1,339	1,369
Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value	[1]	1,339	1,369
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		0	0
Significant Unobservable Inputs (Level 3) [Member] | Cash Equivalents [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		$ 0	$ 0

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