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Goodwill and Other Intangible Assets (2020 Acquisitions) (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2020 USD ($) yr acquisition | Dec. 31, 2019 USD ($) acquisition | Dec. 31, 2018 USD ($) | Jun. 30, 2020
Business Combinations [Line Items] |  |  |  |  |
Business combinations, number of acquisitions | acquisition |  | 5 | 6 |  |
Cash, net of cash acquired and other |  | $ 24,971 | $ 179,481 | $ 6,684 |
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high |  | 179,000 |  |  |
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low |  | $ 48,000 |  |  |
Install to Home [Member] |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Business combinations, number of acquisitions | acquisition |  | 1 |  |  |
Communications and Electrical Transmission [Member] |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Business combinations, number of acquisitions | acquisition |  | 3 |  |  |
Communications [Member] |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Business combinations, percentage of interests acquired |  |  | 96.00% |  |
Business combinations, number of acquisitions | acquisition |  | 1 | 4 |  |
Electrical Transmission [Member] |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Business combinations, number of acquisitions | acquisition |  | 1 |  |  |
Clean Energy and Infrastructure |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Business combinations, percentage of interests acquired |  | 91.00% |  |  | 96.00%
Business combinations, number of acquisitions | acquisition |  |  | 1 |  |
Clean Energy and Infrastructure and Communications |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Business combinations, number of acquisitions | acquisition |  | 2 |  |  |
2020 Acquisitions [Member] |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Cash, net of cash acquired and other |  | $ 23,500 |  |  |
Business combinations, contingent consideration, earn-out liabilities |  | 8,300 |  |  |
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high |  | 13,000 |  |  |
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low |  | $ 1,000 |  |  |
2020 Acquisitions [Member] | Maximum [Member] | Expected Term [Member] |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Business combinations, contingent consideration, earn-out period (in years) | yr |  | 5 |  |  |
2020 Acquisitions [Member] | Forecast [Member] |  |  |  |  |
Business Combinations [Line Items] |  |  |  |  |
Cash, net of cash acquired and other | $ 3,200 |  |  |  |

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