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Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012
Foreign operations: |  |  |  |  |  |  |  |  |  |
Total sales | $ 37,648 | $ 37,434 | $ 34,681 | $ 34,362 | $ 35,696 | $ 37,681 | $ 44,544 | $ 44,529 | $ 144,125 | $ 162,450
Property, plant and equipment — net | 56,478 |  |  |  | 51,558 |  |  |  | 56,478 | 51,558
United States |  |  |  |  |  |  |  |  |  |
Foreign operations: |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 95,063 | 115,226
Property, plant and equipment — net | 24,285 |  |  |  | 17,508 |  |  |  | 24,285 | 17,508
Mexico |  |  |  |  |  |  |  |  |  |
Foreign operations: |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 45,069 | 43,358
Property, plant and equipment — net | 32,193 |  |  |  | 34,050 |  |  |  | 32,193 | 34,050
Canada |  |  |  |  |  |  |  |  |  |
Foreign operations: |  |  |  |  |  |  |  |  |  |
Total sales |  |  |  |  |  |  |  |  | 3,993 | 3,866
CoreComposites de Mexico, S. de R.L. de C.V. |  |  |  |  |  |  |  |  |  |
Foreign operations: |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 61,612 | $ 74,667
Expenses as a percentage of revenues |  |  |  |  |  |  |  |  | 23.00% | 20.00%

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: 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 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) -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 a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Aggregate revenue during the period from sale of goods in the normal course of business, before deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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