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Segments and Related Information (Schedule of Financial Information by Reportable Segment - Capital Expenditures) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Capital Expenditures: |  |  |
Capital expenditures | $ 213,746 | $ 126,473 | $ 180,420
Reportable Segments [Member] | Communications [Member] |  |  |
Capital Expenditures: |  |  |
Capital expenditures | 38,400 | 36,000 | 69,300
Reportable Segments [Member] | Clean Energy and Infrastructure |  |  |
Capital Expenditures: |  |  |
Capital expenditures | 14,000 | 12,700 | 6,500
Reportable Segments [Member] | Oil and Gas [Member] |  |  |
Capital Expenditures: |  |  |
Capital expenditures | 149,200 | 59,700 | 83,500
Reportable Segments [Member] | Electrical Transmission [Member] |  |  |
Capital Expenditures: |  |  |
Capital expenditures | 3,800 | 6,800 | 10,200
Reportable Segments [Member] | Other [Member] |  |  |
Capital Expenditures: |  |  |
Capital expenditures | 0 | 0 | 0
Corporate [Member] |  |  |
Capital Expenditures: |  |  |
Capital expenditures | $ 8,300 | $ 11,300 | $ 10,900

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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