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Schedule I - Summary of Investments Schedule I (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 350,063us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 274,651us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available-for-sale Equity Securities, Amortized Cost Basis 22,278us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis 13,825us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Available-for-sale Securities, Amortized Cost Basis 375,090us-gaap_AvailableForSaleSecuritiesAmortizedCost 291,510us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Debt Securities 352,630us-gaap_AvailableForSaleSecuritiesDebtSecurities 273,024us-gaap_AvailableForSaleSecuritiesDebtSecurities
Available-for-sale Securities, Equity Securities 25,987us-gaap_AvailableForSaleSecuritiesEquitySecurities 15,602us-gaap_AvailableForSaleSecuritiesEquitySecurities
Other Long-term Investments 3,010us-gaap_OtherLongTermInvestments 3,034us-gaap_OtherLongTermInvestments
Investments 381,627us-gaap_Investments 291,660us-gaap_Investments
US Government and Government Agencies and Authorities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 134,601us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAndGovernmentAgenciesAndAuthoritiesMember
98,621us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAndGovernmentAgenciesAndAuthoritiesMember
Available-for-sale Securities, Debt Securities 134,434us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAndGovernmentAgenciesAndAuthoritiesMember
97,480us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAndGovernmentAgenciesAndAuthoritiesMember
Foreign Government Debt Securities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 3,275us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
3,287us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale Securities, Debt Securities 3,354us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
3,227us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
US States and Political Subdivisions Debt Securities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 90,262us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
45,556us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Debt Securities 91,911us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
45,777us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Public Utility, Bonds [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 9,044us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PublicUtilityBondsMember
9,103us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PublicUtilityBondsMember
Available-for-sale Securities, Debt Securities 9,222us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PublicUtilityBondsMember
9,133us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PublicUtilityBondsMember
All Other Corporate Bonds [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 111,787us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AllOtherCorporateBondsMember
118,084us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AllOtherCorporateBondsMember
Available-for-sale Securities, Debt Securities 112,616us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AllOtherCorporateBondsMember
117,407us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AllOtherCorporateBondsMember
Redeemable Preferred Stock [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 1,094us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RedeemablePreferredStockMember
 
Available-for-sale Securities, Debt Securities 1,093us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RedeemablePreferredStockMember
 
Debt Securities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 350,063us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Fixed Maturities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 350,063us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
274,651us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
Available-for-sale Securities, Debt Securities 352,630us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
273,024us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
Public Utility, Equities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 1,222us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PublicUtilityEquitiesMember
804us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PublicUtilityEquitiesMember
Available-for-sale Securities, Equity Securities 1,433us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PublicUtilityEquitiesMember
807us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PublicUtilityEquitiesMember
Common Stock [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 19,560us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
12,749us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Available-for-sale Securities, Equity Securities 23,048us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
14,546us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Nonredeemable Preferred Stock [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 1,496us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_NonredeemablePreferredStockMember
272us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_NonredeemablePreferredStockMember
Available-for-sale Securities, Equity Securities 1,506us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_NonredeemablePreferredStockMember
249us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_NonredeemablePreferredStockMember
Equity Securities [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 22,278us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
13,825us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Available-for-sale Securities, Equity Securities 25,987us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
15,602us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Other Long-term Investments [Member]    
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 2,749us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherLongTermInvestmentsMember
3,034us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherLongTermInvestmentsMember
Other Long-term Investments $ 3,010us-gaap_OtherLongTermInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherLongTermInvestmentsMember
$ 3,034us-gaap_OtherLongTermInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherLongTermInvestmentsMember