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Segment and Geographical Area Information, Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 productionfacilities | Jun. 30, 2016 | Dec. 31, 2016 customer
Segment Reporting Information |  |  |  |  |
Percentage of Employees Covered by Collective Bargaining Agreements | 63.00% |  | 63.00% |  |
Percentage of Employees Covered by Collective Bargaining Agreements Expiring Within One Year | 16.00% |  | 16.00% |  |
Domestic |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Number of production facilities |  |  | 11 |  |
Foreign |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Number of production facilities |  |  | 1 |  |
Customer Concentration Risk | Largest Customer | Sales Revenue, Net | Fabricated Products |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage | 28.00% | 27.00% | 29.00% | 26.00% |
Customer Concentration Risk | Largest Customer | Accounts Receivable |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage |  |  | 18.00% |  | 18.00%
Customer Concentration Risk | Second Largest Customer | Sales Revenue, Net | Fabricated Products |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage | 12.00% | 10.00% | 11.00% | 10.00% |
Customer Concentration Risk | Second Largest Customer | Accounts Receivable |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage |  |  | 16.00% |  | 12.00%
Customer Concentration Risk | Second Largest Customer | Accounts Receivable | Fabricated Products |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Number of Customers | customer |  |  |  |  | 2
Customer Concentration Risk | Second Largest Customer (number 2) | Accounts Receivable |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 12.00%

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