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Goodwill and Other Intangible Assets (Schedule of Goodwill by Segment) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Goodwill [Line Items] |  |
Goodwill, balance as of September 30, 2015 | $ 1,064,822 | $ 1,082,466
Communications [Member] |  |
Goodwill [Line Items] |  |
Goodwill, balance as of September 30, 2015 | 418,500 |
Oil and Gas [Member] |  |
Goodwill [Line Items] |  |
Goodwill, balance as of September 30, 2015 | 378,800 |
Electrical Transmission [Member] |  |
Goodwill [Line Items] |  |
Goodwill, balance as of September 30, 2015 | 149,900 |
Power Generation and Industrial [Member] |  |
Goodwill [Line Items] |  |
Goodwill, balance as of September 30, 2015 | $ 117,600 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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