Share-Based Compensation	6 Months Ended
Jun. 30, 2020
Share-Based Compensation [Abstract]
Share-Based Compensation	(12) Share-Based Compensation As of June 30, 2020, there were 1,185,089 shares of common stock available for grant under the Tutor Perini Corporation Omnibus Incentive Plan. During the first six months of 2020 and 2019, the Company granted the following share-based instruments: (1) restricted stock units totaling 75,000 and 175,000 with weighted-average fair values per share of $13.93 and $20.41, respectively; (2) stock options totaling 75,000 and 85,000 with weighted-average fair values per share of $3.94 and $7.57, respectively, and weighted-average per share exercise prices of $25.70 and $25.62, respectively; and (3) unrestricted stock units totaling 194,177 and 98,591 with weighted-average fair values per share of $8.60 and $15.72, respectively. During the six months ended June 30, 2019, 750,000 stock options with a weighted-average per share exercise price of $20.33 expired. The fair value of restricted and unrestricted stock units is based on the closing price of the Company’s common stock on the New York Stock Exchange on the date of the grant and the fair value of stock options is based on the Black-Scholes model. The fair value of stock options granted during the first six months of 2020 was determined using the Black-Scholes model based on the following weighted-average assumptions: (i) expected life of 6.0 years, (ii) expected volatility of 44.91%, (iii) risk-free rate of 1.56%, and (iv) no quarterly dividends. Certain performance-based awards contain market condition components and are valued on the date of grant using a Monte Carlo simulation model. For the three and six months ended June 30, 2020, the Company recognized, as part of general and administrative expenses, costs for share-based payment arrangements totaling $3.8 million and $8.3 million, respectively, and $4.6 million and $10.1 million for the three and six months ended June 30, 2019, respectively. As of June 30, 2020, the balance of unamortized share-based compensation expense was $14.8 million, which is expected to be recognized over a weighted-average period of 1.7 years.

Share-Based Compensation

6 Months Ended

Jun. 30, 2020

(12) Share-Based Compensation

As of June 30, 2020, there were 1,185,089 shares of common stock available for grant under the Tutor Perini Corporation Omnibus Incentive Plan. During the first six months of 2020 and 2019, the Company granted the following share-based instruments: (1) restricted stock units totaling 75,000 and 175,000 with weighted-average fair values per share of $13.93 and $20.41, respectively; (2) stock options totaling 75,000 and 85,000 with weighted-average fair values per share of $3.94 and $7.57, respectively, and weighted-average per share exercise prices of $25.70 and $25.62, respectively; and (3) unrestricted stock units totaling 194,177 and 98,591 with weighted-average fair values per share of $8.60 and $15.72, respectively. During the six months ended June 30, 2019, 750,000 stock options with a weighted-average per share exercise price of $20.33 expired.

The fair value of restricted and unrestricted stock units is based on the closing price of the Company’s common stock on the New York Stock Exchange on the date of the grant and the fair value of stock options is based on the Black-Scholes model. The fair value of stock options granted during the first six months of 2020 was determined using the Black-Scholes model based on the following weighted-average assumptions: (i) expected life of 6.0 years, (ii) expected volatility of 44.91%, (iii) risk-free rate of 1.56%, and (iv) no quarterly dividends. Certain performance-based awards contain market condition components and are valued on the date of grant using a Monte Carlo simulation model.

For the three and six months ended June 30, 2020, the Company recognized, as part of general and administrative expenses, costs for share-based payment arrangements totaling $3.8 million and $8.3 million, respectively, and $4.6 million and $10.1 million for the three and six months ended June 30, 2019, respectively. As of June 30, 2020, the balance of unamortized share-based compensation expense was $14.8 million, which is expected to be recognized over a weighted-average period of 1.7 years.