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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company leases, at market rates, certain facilities from an entity owned by Ronald N. Tutor, the Company’s Chairman and Chief Executive Officer. Under these leases, the Company paid $3.2 million in 2020, $3.1 million in 2019 and $3.0 million in 2018, and recognized expense of $3.2 million in each of the three years. Raymond R. Oneglia, Vice Chairman of O&G, is a director of the Company. The Company occasionally forms construction project joint ventures with O&G. During the three years ended December 31, 2020, the Company had active joint ventures with O&G including two infrastructure projects in the northeastern United States that were completed in 2017 and two mass-transit projects in Los Angeles, California to construct the Purple Line Extension Section 2 (Tunnels and Stations) and Section 3 (Stations), in which the Company’s and O&G’s joint venture interests are 75% and 25%, respectively. O&G may provide equipment and services to these joint ventures on customary trade terms; there were no material payments made by these joint ventures to O&G for services and equipment during the years ended December 31, 2020, 2019 and 2018. Peter Arkley, Senior Managing Director, Construction Services Group, of Alliant Insurance Services, Inc. (“Alliant”), is a director of the Company. The Company uses Alliant for various insurance-related services. The associated expenses for services provided for the years ended December 31, 2020, 2019 and 2018 were $16.0 million, $18.4 million and $14.7 million, respectively. The Company owed Alliant $2.7 million as of both December 31, 2020 and 2019 for services rendered.