Investments, Fair Value Measured on a Recurring Basis (Details) - Recurring [Member] - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		$ 252,318	$ 240,738
Fixed Maturities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		215,108	210,670
Equity Securities [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		23,355	20,257
Cash Equivalents [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		13,855	9,811
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		31,828	24,964
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		17,973	15,153
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		13,855	9,811
Significant Other Observable Inputs (Level 2) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Assets at fair value		219,121	214,510
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		213,739	209,406
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]	5,382	5,104
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		1,369	1,264
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]	1,369	1,264
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.