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Segments and Related Information (Schedule of Financial Information by Reportable Segment - Depreciation and Amortization) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | $ 42,196 | $ 41,747 | $ 128,048 | $ 111,996
Reportable Segments [Member] | Communications [Member] |  |  |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | 13,200 | 10,100 | 37,600 | 30,100
Reportable Segments [Member] | Oil and Gas [Member] |  |  |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | 20,000 | 23,300 | 64,300 | 61,300
Reportable Segments [Member] | Electrical Transmission [Member] |  |  |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | 5,500 | 5,200 | 16,000 | 11,900
Reportable Segments [Member] | Power Generation and Industrial [Member] |  |  |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | 1,700 | 1,700 | 5,000 | 4,800
Reportable Segments [Member] | Other [Member] |  |  |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | 0 | 0 | 100 | 0
Corporate [Member] |  |  |  |
Depreciation and Amortization: |  |  |  |
Depreciation and amortization | $ 1,800 | $ 1,400 | $ 5,000 | $ 3,900

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + 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 (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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