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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 2,723,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,705,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property and equipment, accumulated depreciation 41,486,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 36,456,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Intangible assets, accumulated amortization $ 5,864,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 2,005,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 30,000,000us-gaap_CommonStockSharesAuthorized 30,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 17,152,743us-gaap_CommonStockSharesIssued 16,936,128us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 15,493,752us-gaap_CommonStockSharesOutstanding 15,277,137us-gaap_CommonStockSharesOutstanding
Treasury stock, shares outstanding 1,658,991us-gaap_TreasuryStockShares 1,658,991us-gaap_TreasuryStockShares