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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract] |
Estimated useful lives by major classes of property and equipment | Estimated useful lives by major classes of property and equipment are as follows:
Land improvements |  |  | 15 – 30 years |  |  |
Buildings |  |  | 20 – 40 years |  |  |
Machinery and equipment |  |  | 3 – 30 years |  |  |
Schedule of Goodwill |
|  | Total |
Goodwill balance, December 31, 2010 |  | $ | 21,451 |
Goodwill written off related to sale of business |  |  | (973 | )
|  |  | — |
Goodwill balance, December 31, 2011 |  |  | 20,478 |
Goodwill balance, December 31, 2012 |  | $ | 20,478 |
Summary of accumulated other comprehensive income (loss) | Accumulated other comprehensive loss consists of the following:
|  | December 31, |
|  | 2012 |  |  | 2011 |
|  | (in thousands) |
Pension liability adjustment, net of tax benefit of $1,244 and $1,294 |  | $ | (2,188 | ) |  | $ | (2,326 | )
Deferred gain (loss) on cash flow derivatives, net of tax benefit of $50 and expense of $44 |  |  | (85 | ) |  |  | 14 |
Total |  | $ | (2,273 | ) |  | $ | (2,312 | )
Summary of earnings (loss) per basic and diluted weighted average common shares outstanding | Earnings (loss) per basic and diluted weighted average common shares outstanding was calculated as follows for the years ended December 31 (in thousands, except per share data):
|  | 2012 |  |  | 2011 |  |  | 2010 |
Net income (loss) |  | $ | 16,244 |  |  | $ | 12,660 |  |  | $ | (5,440 | )
Basic weighted-average common shares outstanding |  |  | 9,377 |  |  |  | 9,333 |  |  |  | 9,278 |
Effect of potentially dilutive common shares (1) |  |  | 68 |  |  |  | 51 |  |  |  | — |
Diluted weighted-average common shares outstanding |  |  | 9,445 |  |  |  | 9,384 |  |  |  | 9,278 |
Earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per basic common share |  | $ | 1.73 |  |  | $ | 1.36 |  |  | $ | (0.59 | )
Earnings (loss) per diluted common share |  |  | 1.72 |  |  |  | 1.35 |  |  |  | (0.59 | )
Antidilutive shares excluded from net earnings per diluted common share calculation |  |  | 92 |  |  |  | 58 |  |  |  | 47 |
(1) | Represents the effect of the assumed exercise of stock options and the vesting of restricted stock units and performance stock awards, based on the treasury stock method.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of public utility property plant and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499596&loc=d3e42232-110370 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 210.5-02.13(b)) -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 13 -Subparagraph b -Article 5 + Details
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