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Business and Credit Concentrations (Details) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net sales to foreign customers outside the U.S. and Canada |  |  |
Schedule of significant portions of the Company's net sales |  |  |
Net sales, percentage | 37.00% | 40.00% | 29.00%
Net sales to SANG |  |  |
Schedule of significant portions of the Company's net sales |  |  |
Net sales, percentage | 12.00% | 11.00% |
Net sales to General Dynamics Land Systems-Canada |  |  |
Schedule of significant portions of the Company's net sales |  |  |
Net sales, percentage |  |  | 11.00%

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