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Other Comprehensive Income (Loss) (Schedule of Tax Effects of the Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Defined benefit pension plan adjustments, Before-Tax Amount | $ 464 | $ 513 | $ 1,390 | $ 1,539
Defined benefit pension plan adjustments, Tax (Expense) Benefit | (133) | (148) | (398) | (439)
Defined benefit pension plan adjustments, Net-of-Tax Amount | 331 | 365 | 992 | 1,100
Foreign currency translation adjustments, Before-Tax Amount | (590) | 519 | 961 | (2,034)
Foreign currency translation adjustments, Tax (Expense) Benefit | 140 | (143) | (253) | 602
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total | (450) | 376 | 708 | (1,432)
Unrealized gain (loss) in fair value of investments, Before-Tax Amount | 328 | (173) | 2,053 | (1,468)
Unrealized gain (loss) in fair value of investments, Tax (Expense) Benefit | (72) | 44 | (438) | 325
Unrealized gain (loss) in fair value of investments, Net-of-Tax Amount | 256 | (129) | 1,615 | (1,143)
Total other comprehensive income (loss), Before-Tax Amount | 202 | 859 | 4,404 | (1,963)
Total other comprehensive income (loss), Tax (Expense) Benefit | (65) | (247) | (1,089) | 488
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | 137 | 612 | 3,315 | (1,475)
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Before-of-Tax Amount | (99) | 0 | 160 | 0
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Tax (Expense) Benefit | 0 | 0 | 0 | 0
Less: Other comprehensive income (loss) attributable to noncontrolling interests, Net-of-Tax Amount | (99) | 0 | 160 | 0
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Before-Tax Amount | 301 | 859 | 4,244 | (1,963)
Total other comprehensive income (loss) attributable to Tutor Perini Corporation, Tax (Expense) Benefit | (65) | (247) | (1,089) | 488
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | $ 236 | $ 612 | $ 3,155 | $ (1,475)

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