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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables:    
Insurance premiums and other, allowance for doubtful accounts $ 439us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables $ 339us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
Shareholders' equity:    
Preferred stock, par value (in dollars per share) $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized (in shares) 4,000,000us-gaap_PreferredStockSharesAuthorized 4,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 55,000us-gaap_PreferredStockSharesIssued 65,000us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding (in shares) 55,000us-gaap_PreferredStockSharesOutstanding 65,000us-gaap_PreferredStockSharesOutstanding
Preferred stock, redemption value $ 5,500us-gaap_PreferredStockRedemptionAmount $ 6,500us-gaap_PreferredStockRedemptionAmount
Common stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 22,400,894us-gaap_CommonStockSharesIssued 22,400,894us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 20,600,039us-gaap_CommonStockSharesOutstanding 21,117,874us-gaap_CommonStockSharesOutstanding
Treasury stock, at cost (in shares) 1,800,855us-gaap_TreasuryStockShares 1,283,020us-gaap_TreasuryStockShares