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Segments and Related Information (Schedule of Financial Information by Reportable Segment - Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Revenue: |  |  |  |  |
Revenue (in dollars) |  | $ 1,111,010 | $ 1,315,488 | $ 3,180,906 | $ 3,380,538
Communications [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Utilities [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Utilities customers, percentage of Communications segment revenue |  | 11.20% | 7.60% | 10.50% | 7.00%
Reportable Segments [Member] | Communications [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Revenue (in dollars) | [1] | $ 513,300 | $ 505,200 | $ 1,452,100 | $ 1,480,400
Reportable Segments [Member] | Oil and Gas [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Revenue (in dollars) |  | 406,900 | 554,400 | 1,144,200 | 1,299,300
Reportable Segments [Member] | Electrical Transmission [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Revenue (in dollars) |  | 75,900 | 138,400 | 270,200 | 329,100
Reportable Segments [Member] | Power Generation and Industrial [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Revenue (in dollars) |  | 115,000 | 114,300 | 302,300 | 263,100
Reportable Segments [Member] | Other [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Revenue (in dollars) |  | 3,800 | 4,100 | 17,200 | 10,600
Eliminations [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Revenue (in dollars) |  | $ (3,900) | $ (900) | $ (5,100) | $ (2,000)
[1] | Revenue generated by utilities customers represented 11.2% and 7.6% of Communications segment revenue for the three month periods ended September 30, 2015 and 2014, respectively, and represented 10.5% and 7.0% for the nine month periods ended September 30, 2015 and 2014, respectively.

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