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Goodwill and Other Intangible Assets (Schedule of Goodwill by Segment) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill, gross | $ 1,458,700 |
Accumulated impairment loss | (127,000) |
Goodwill, net | 1,331,699 | $ 1,243,034
Communications |  |
Goodwill [Line Items] |  |
Goodwill, gross | 584,700 |
Accumulated impairment loss | 0 |
Goodwill, net | 584,700 |
Clean Energy and Infrastructure |  |
Goodwill [Line Items] |  |
Goodwill, gross | 164,400 |
Accumulated impairment loss | 0 |
Goodwill, net | 164,400 |
Oil and Gas |  |
Goodwill [Line Items] |  |
Goodwill, gross | 513,200 |
Accumulated impairment loss | (127,000) |
Goodwill, net | 386,200 |
Electrical Transmission |  |
Goodwill [Line Items] |  |
Goodwill, gross | 196,400 |
Accumulated impairment loss | 0 |
Goodwill, net | $ 196,400 |

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