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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2016 USD ($) $ / shares | Jun. 30, 2017 USD ($) segment $ / shares | Jun. 30, 2016 USD ($) contract $ / shares
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 3 |
Income from construction operations | $ 34,045 | $ 48,829 | $ 71,062 | $ 88,951
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares | $ 0.59 | $ 0.43 | $ 0.86 | $ 0.74
Building [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | $ 5,736 | $ 13,223 | $ 10,977 | $ 25,673
Civil [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | 58,144 | 45,056 | 90,032 | 78,721
Specialty Contractors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | (14,007) | 5,413 | 755 | 14,826
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | $ (15,828) | $ (14,863) | $ (30,702) | (30,269)
Five Star Electric [Member] | Specialty Contractors [Member] | Scenario Favorable Adjustment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations |  |  |  | $ 3,000
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  |  |  | $ 0.04
Five Star Electric Subcontract [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of projects | contract |  |  |  | 2
Five Star Electric Subcontract [Member] | Scenario Unfavorable Adjustment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations |  |  |  | $ 13,800
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  |  |  | $ 0.17
Five Star Electric Subcontract [Member] | Scenario Favorable Adjustment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations |  |  |  | $ 14,000
DILUTED EARNINGS PER COMMON SHARE (in dollars per share) | $ / shares |  |  |  | $ 0.17

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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