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CONSOLIDATED BALANCE SHEETS [Parenthetical] (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts Receivable, Current $ 1,028us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,179us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 155,911us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 147,956us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Finite-Lived Intangible Assets, Accumulated Amortization $ 3,310us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 3,227us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Preferred Stock, Par or Stated Value Per Share $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, Shares Authorized 4,000,000us-gaap_PreferredStockSharesAuthorized 4,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Shares Issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, Shares Outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common Stock, Par or Stated Value Per Share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued 20,898,110us-gaap_CommonStockSharesIssued 20,791,623us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding 20,898,110us-gaap_CommonStockSharesOutstanding 20,791,623us-gaap_CommonStockSharesOutstanding