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Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Balances by Component (After-Tax)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period |  |  | $ 1,291,588 |
Balance at the beginning of the period, noncontrolling interests |  |  | (7,677) |
Other comprehensive income (loss) before reclassifications | $ (355) | $ (508) | (1,096) | $ 894
Amounts reclassified from AOCI | 291 | 339 | 657 | 664
Total other comprehensive income (loss) | (64) | (169) | (439) | 1,558
Other comprehensive income (loss) | (193) | 401 | (660) | 554
Balance at the end of the period, noncontrolling interests | 6,162 |  | 6,162 |
Balance at the end of the period | 1,309,955 |  | 1,309,955 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period | (40,162) | (45,310) | (39,787) | (47,037)
Balance at the end of the period | (40,226) | (45,479) | (40,226) | (45,479)
Defined Benefit Pension Plan |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period | (29,033) | (32,336) | (29,354) | (32,637)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 321 | 296 | 642 | 597
Total other comprehensive income (loss) | 321 | 296 | 642 | 597
Balance at the end of the period | (28,712) | (32,040) | (28,712) | (32,040)
Foreign Currency Translation |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period | (7,321) | (7,010) | (6,893) | (7,241)
Other comprehensive income (loss) before reclassifications | (463) | 90 | (891) | 321
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
Total other comprehensive income (loss) | (463) | 90 | (891) | 321
Balance at the end of the period | (7,784) | (6,920) | (7,784) | (6,920)
Unrealized Gain (Loss) in Fair Value of Investments, Net |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period | (3,808) | (5,964) | (3,540) | (7,159)
Other comprehensive income (loss) before reclassifications | 108 | (598) | (205) | 573
Amounts reclassified from AOCI | (30) | 43 | 15 | 67
Total other comprehensive income (loss) | 78 | (555) | (190) | 640
Balance at the end of the period | (3,730) | (6,519) | (3,730) | (6,519)
AOCI Attributable to Noncontrolling Interest |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period, noncontrolling interests | (1,198) | (1,577) | (731) | (1,730)
Balance at the end of the period, noncontrolling interests | (1,391) | (1,176) | (1,391) | (1,176)
Defined Benefit Pension Plan |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period, noncontrolling interests | 0 | 0 | 0 | 0
Other comprehensive income (loss) | 0 | 0 | 0 | 0
Balance at the end of the period, noncontrolling interests | 0 | 0 | 0 | 0
Foreign Currency Translation |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period, noncontrolling interests | (811) | (780) | (312) | (799)
Other comprehensive income (loss) | (240) | 438 | (739) | 457
Balance at the end of the period, noncontrolling interests | (1,051) | (342) | (1,051) | (342)
Unrealized Gain (Loss) in Fair Value of Investments, Net |  |  |  |
Attributable to Tutor Perini Corporation: |  |  |  |
Balance at the beginning of the period, noncontrolling interests | (387) | (797) | (419) | (931)
Other comprehensive income (loss) | 47 | (37) | 79 | 97
Balance at the end of the period, noncontrolling interests | $ (340) | $ (834) | $ (340) | $ (834)

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