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Background and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Background and Significant Accounting Policies |  |  |
Number of primary business lines | 3 exh_NumberOfPrimaryBusinessLines |  |
Concentrations of Credit Risk |  |  |
Minimum period after receivable balances are past due that significant accounts are reviewed individually for collectability | 90 days |  |
Bad debt expenses | $ 2.4 us-gaap_ProvisionForDoubtfulAccounts | $ 2.2 us-gaap_ProvisionForDoubtfulAccounts | $ 8.8 us-gaap_ProvisionForDoubtfulAccounts
Minimum |  |  |
Revenue Recognition |  |  |
Duration of fabrication projects | 3 months |  |
Maximum |  |  |
Revenue Recognition |  |  |
Duration of fabrication projects | 24 months |  |

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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