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Share-Based Compensation (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized for grant | 1,539,172 |  |  |
Number of vested and exercisable stock options (in shares) | 1,715,265 |  |  |
Stock options exercised, intrinsic value | $ 900,000 |  |  |
Vested and exercisable stock options, weighted average exercise price (in dollars per share) | $ 20.43 |  |  |
Weighted average remaining contractual term of outstanding stock options | 3 years 6 months |  |  |
Share-based compensation expense | $ 11,833,000 | $ 19,143,000 | $ 22,782,000 |
Share based compensation, tax benefits | 1,300,000 | 2,900,000 | 3,800,000 |
Employee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 10,200,000 | 17,500,000 | 21,100,000 |
Non-employee Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 1,600,000 | $ 1,600,000 | $ 1,700,000 |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options expiration period | 10 years |  |  |
Stock option expense | $ 2,300,000 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years |  |  |
Total granted and outstanding (in shares) | 2,275,265 | 2,279,015 | 2,943,044 | 2,554,034
Aggregate Intrinsic value | $ 900,000 |  |  |
Weighted average remaining contractual term of outstanding stock options | 4 years 7 months 6 days |  |  |
Stock options granted but not vested (in shares) | 560,000 |  |  |
Stock options granted, weighted-average exercise price (in dollars per share) | $ 19.21 |  |  |
Stock options granted, weighted-average remaining contractual life | 8 years 1 month 6 days |  |  |
Stock options granted and expected to vest (in shares) | 328,125 |  |  |
Stock options granted and not expected to vest (in shares) | 231,875 |  |  |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units with guaranteed minimum payouts outstanding (in shares) | 1,035,000 | 1,715,000 | 1,469,000 | 1,397,984
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share) | $ 21.85 | $ 25.19 | $ 27.27 | $ 30.11
Fair value of restricted stock units that vested during period | $ 4,100,000 | $ 3,100,000 | $ 7,900,000 |
Restricted stock expense | $ 9,000,000.0 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years |  |  |
Unrestricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of unrestricted stock units issued | $ 1,700,000 | $ 1,500,000 | 2,500,000 |
Restricted Stock Units, Guaranteed Minimum Payouts |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock units with guaranteed minimum payouts outstanding (in shares) | 270,000 | 390,000 |  |
Stock units with guaranteed minimum payouts outstanding, weighted-average grant date fair value (in dollars per share) | $ 27.80 | $ 27.89 |  |
Stock units with guaranteed minimum payouts outstanding, recognized liabilities | $ 2,400,000 | $ 2,900,000 |  |
Paid to settle share-based awards | $ 300,000 | $ 0 | $ 0 |
Amended and Restated Tutor Perini Corporation Long-Term Incentive Plan (“Incentive Plan”) | Restricted Stock Units And Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate number of shares outstanding, historical awards that either have not vested or have vested but not exercised | 3,310,265 |  |  |

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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