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CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Statement of Financial Position [Abstract] |  |
Accounts receivable, allowance for doubtful accounts | $ 1,501 | $ 1,655
Property, plant and equipment, accumulated depreciation | $ 227,348 | $ 222,189
Capital Stock, par value (in dollars per share) | $ 1 | $ 1
Capital Stock, authorized shares (shares) | 50,000,000 | 50,000,000
Capital Stock, shares outstanding (shares) | 18,226,942 | 17,854,506

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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