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Segment and Geographical Area Information, Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2015 productionfacilities customer | Dec. 31, 2014 customer | Dec. 31, 2013 customer
Segment Reporting Information |  |  |  |
Percentage of Employees Covered by Collective Bargaining Agreements |  | 63.00% |  |
Percentage of Employees Covered by Collective Bargaining Agreements Expiring Within One Year |  | 10.00% |  |
United States |  |  |  |
Segment Reporting Information |  |  |  |
Number of production facilities | productionfacilities |  | 11 |  |
Canada |  |  |  |
Segment Reporting Information |  |  |  |
Number of production facilities | productionfacilities |  | 1 |  |
Customer Concentration Risk | Net sales | Largest Customer | Fabricated Products |  |  |  |
Segment Reporting Information |  |  |  |
Concentration risk, percentage |  | 25.00% | 22.00% | 23.00%
Number of Customers | customer |  | 1 | 1 | 1
Customer Concentration Risk | Net sales | Second Largest Customer | Fabricated Products |  |  |  |
Segment Reporting Information |  |  |  |
Concentration risk, percentage | 10.00% | 10.00% |  |
Customer Concentration Risk | Trade Receivables | Largest Customer |  |  |  |
Segment Reporting Information |  |  |  |
Concentration risk, percentage |  |  | 10.00% |
Customer Concentration Risk | Trade Receivables | Second Largest Customer |  |  |  |
Segment Reporting Information |  |  |  |
Concentration risk, percentage |  | 17.00% | 12.00% |
Number of Customers | customer |  | 2 | 2 |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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