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Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Gross goodwill as of December 31, 2020 |  | $ 1,072,991
Accumulated impairment as of December 31, 2020 |  | (867,848)
Balance at beginning of period | $ 205,143 |
Current year activity | 0 |
Balance at end of period | 205,143 |
Civil |  |
Goodwill [Roll Forward] |  |
Gross goodwill as of December 31, 2020 |  | 492,074
Accumulated impairment as of December 31, 2020 |  | (286,931)
Balance at beginning of period | 205,143 |
Current year activity | 0 |
Balance at end of period | 205,143 |
Building |  |
Goodwill [Roll Forward] |  |
Gross goodwill as of December 31, 2020 |  | 424,724
Accumulated impairment as of December 31, 2020 |  | (424,724)
Balance at beginning of period | 0 |
Current year activity | 0 |
Balance at end of period | 0 |
Specialty Contractors |  |
Goodwill [Roll Forward] |  |
Gross goodwill as of December 31, 2020 |  | 156,193
Accumulated impairment as of December 31, 2020 |  | $ (156,193)
Balance at beginning of period | 0 |
Current year activity | 0 |
Balance at end of period | $ 0 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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