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Goodwill and Intangible Assets (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Goodwill |  |
Gross Goodwill Balance |  | $ 1,065,741
Accumulated Impairment |  | (487,985)
Goodwill | 585,006 | 577,756
Civil [Member] |  |
Goodwill |  |
Gross Goodwill Balance |  | 429,893
Accumulated Impairment |  | (55,740)
Goodwill | 415,358 | 374,153
Building [Member] |  |
Goodwill |  |
Gross Goodwill Balance |  | 420,267
Accumulated Impairment |  | (409,765)
Goodwill | 13,455 | 10,502
Specialty Contractors [Member] |  |
Goodwill |  |
Gross Goodwill Balance |  | 148,943
Goodwill | 156,193 | 148,943
Management Services [Member] |  |
Goodwill |  |
Gross Goodwill Balance |  | 66,638
Accumulated Impairment |  | (22,480)
Goodwill |  | $ 44,158

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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=14024403&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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