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Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Land owned [Member] | Dec. 31, 2011 Land owned [Member] | Dec. 31, 2012 Land under capital lease [Member] | Dec. 31, 2011 Land under capital lease [Member] | Dec. 31, 2012 Buildings and Improvements Owned [Member] | Dec. 31, 2011 Buildings and Improvements Owned [Member] | Dec. 31, 2012 Buildings and Improvements Owned [Member] Maximum [Member] | Dec. 31, 2012 Buildings and Improvements Owned [Member] Minimum [Member] | Dec. 31, 2012 Buildings under capital lease [Member] | Dec. 31, 2011 Buildings under capital lease [Member] | Dec. 31, 2012 Buildings under capital lease [Member] Maximum [Member] | Dec. 31, 2012 Machinery and Equipment [Member] | Dec. 31, 2011 Machinery and Equipment [Member] | Dec. 31, 2012 Machinery and Equipment [Member] Maximum [Member] | Dec. 31, 2012 Machinery and Equipment [Member] Minimum [Member] | Dec. 31, 2012 Construction in process [Member] | Dec. 31, 2011 Construction in process [Member]
Summary of Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Useful Life |  |  |  |  |  |  |  |  |  | 40 years | 15 years |  |  | 20 years |  |  | 12 years | 3 years |  |
Property, plant and equipment, Gross | $ 318,587 | $ 298,387 |  | $ 5,937 | $ 5,851 | $ 1,396 | $ 1,378 | $ 43,751 | $ 42,634 |  |  | $ 3,082 | $ 3,039 |  | $ 244,138 | $ 237,051 |  |  | $ 20,283 | $ 8,434
Less - accumulated depreciation | 198,900 | 177,859 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | $ 119,687 | $ 120,528 | $ 118,488 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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