Share-Based Compensation	3 Months Ended
Mar. 31, 2020
Share-Based Compensation [Abstract]
Share-Based Compensation	(12) Share-Based Compensation As of March 31, 2020, there were 1,379,266 shares of common stock available for grant under the Tutor Perini Corporation Omnibus Incentive Plan. During the first three months of 2020 and 2019, the Company issued 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; and (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. 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 three 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 months ended March 31, 2020 and 2019, the Company recognized, as part of general and administrative expenses, costs for share-based payment arrangements totaling $4.5 million and $5.5 million, respectively. As of March 31, 2020, the balance of unamortized share-based compensation expense was $18.1 million, which is expected to be recognized over a weighted-average period of 1.8 years.

Share-Based Compensation

3 Months Ended

Mar. 31, 2020

(12) Share-Based Compensation

As of March 31, 2020, there were 1,379,266 shares of common stock available for grant under the Tutor Perini Corporation Omnibus Incentive Plan. During the first three months of 2020 and 2019, the Company issued 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; and (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.

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 three 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 months ended March 31, 2020 and 2019, the Company recognized, as part of general and administrative expenses, costs for share-based payment arrangements totaling $4.5 million and $5.5 million, respectively. As of March 31, 2020, the balance of unamortized share-based compensation expense was $18.1 million, which is expected to be recognized over a weighted-average period of 1.8 years.