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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Amortized cost of investments $ 119,119us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 126,873us-gaap_AvailableForSaleSecuritiesAmortizedCost
Allowance for premiums and fees receivable 392us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables 311us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 41,016,000us-gaap_CommonStockSharesIssued 40,983,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 41,016,000us-gaap_CommonStockSharesOutstanding 40,983,000us-gaap_CommonStockSharesOutstanding
Accumulated Other Comprehensive Income $ 923us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax