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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 906us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 476us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property, plant and equipment, accumulated depreciation $ 221,200us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 225,092us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Capital Stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Capital Stock, authorized shares (shares) 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Capital Stock, shares outstanding (shares) 18,605,116us-gaap_CommonStockSharesOutstanding 18,403,109us-gaap_CommonStockSharesOutstanding