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Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) $ / shares | Jun. 30, 2014 USD ($) segment $ / shares | Jun. 30, 2015 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares
Change in Accounting Estimate [Line Items] |  |  |  |
Number of Civil segment projects | segment |  | 2 |  |
Income from construction operations | $ 30,881 | $ 65,443 | $ 50,965 | $ 106,940
Net income | $ 11,777 | $ 28,545 | $ 16,903 | $ 44,484
Diluted earnings per common share (in dollars per share) | $ / shares | $ 0.24 | $ 0.58 | $ 0.34 | $ 0.91
Civil Segment Project One [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Impact on results of operations |  | $ 24,200 |  |
Civil Segment Project Two [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Impact on results of operations |  | (9,400) |  |
Changes In Estimates [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Income from construction operations | $ 14,700 | 14,800 |  | $ 14,800
Net income | $ (8,700) | $ 8,800 |  | $ 8,800
Diluted earnings per common share (in dollars per share) | $ / shares | $ (0.17) | $ 0.18 |  | $ 0.18
Tutor Perini Corporation [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Income from construction operations | $ 18,799 | $ 11,082 | $ 20,223 | $ 26,320
Net income | $ 11,777 | $ 28,545 | $ 16,903 | $ 44,484

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