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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION:Quanta has stock-based compensation awards outstanding under two equity incentive plans, the Quanta Services, Inc. 2011 Omnibus Equity Incentive Plan and the Quanta Services, Inc. 2019 Omnibus Equity Incentive Plan. For descriptions and further information regarding these plans, refer to Note 14 of the Notes to Consolidated Financial Statements in Item 8. Financial Statements and Supplementary Data in Part II of the 2021 Annual Report. Restricted Stock Units (RSUs) to be Settled in Common Stock A summary of the activity for RSUs to be settled in common stock for the three months ended March 31, 2022 and 2021 is as follows (RSUs in thousands):
| 2022 |  | 2021
| RSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | RSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 3,880 |  |  | $61.64 |  | 3,869 |  |  | $37.57
Granted | 768 |  |  | $110.24 |  | 898 |  |  | $82.21
Vested | (1,177) |  |  | $48.50 |  | (1,334) |  |  | $36.85
Forfeited | (38) |  |  | $63.66 |  | (42) |  |  | $37.37
Unvested at March 31 | 3,433 |  |  | $77.09 |  | 3,391 |  |  | $49.69
The grant date fair value for RSUs to be settled in common stock is based on the market value of Quanta common stock on the date of grant. The approximate fair value of RSUs that vested during the three months ended March 31, 2022 and 2021 was $132.9 million and $111.2 million. During the three months ended March 31, 2022 and 2021, Quanta recognized $19.5 million and $15.1 million of non-cash stock compensation expense related to RSUs to be settled in common stock. Such expense is recorded in “Selling, general and administrative expenses.” As of March 31, 2022, there was $195.3 million of total unrecognized compensation expense related to unvested RSUs to be settled in common stock granted to both employees and non-employees. This cost is expected to be recognized over a weighted average period of 4.04 years. Performance Stock Units (PSUs) to be Settled in Common Stock A summary of the activity for PSUs to be settled in common stock for the three months ended March 31, 2022 and 2021 is as follows (PSUs in thousands):
| 2022 |  | 2021
| PSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | PSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 931 |  |  | $47.27 |  | 1,047 |  |  | $37.65
Granted | 148 |  |  | $119.04 |  | 172 |  |  | $90.28
Vested | (334) |  |  | $40.15 |  | (268) |  |  | $38.28
Forfeited | — |  |  | N/A |  | (11) |  |  | $36.90
Unvested at March 31 | 745 |  |  | $64.69 |  | 940 |  |  | $47.14
The grant date fair value for PSUs is determined as follows: (i) for the portion of the awards based on company financial and operational performance metrics, by utilizing the closing price of Quanta’s common stock on the date of grant and (ii) for the portion of the awards based on total shareholder return, by utilizing a Monte Carlo simulation valuation methodology. The Monte Carlo simulation valuation methodology applied the following key inputs:
|  | 2022 |  | 2021
Valuation date price based on March 2, 2022 and March 25, 2021 closing stock prices of Quanta common stock |  | $110.24 |  | $83.48
Expected volatility |  | 39 | % |  | 36 | %
Risk-free interest rate |  | 1.64 | % |  | 0.26 | %
Term in years |  | 2.83 |  | 2.77
During the three months ended March 31, 2022 and 2021, Quanta recognized $3.5 million and $3.6 million of non-cash stock compensation expense related to PSUs to be settled in common stock. Such expense is recorded in “Selling, general and administrative expenses.” As of March 31, 2022, there was $30.5 million of total unrecognized compensation expense related to unvested PSUs. This cost is expected to be recognized over a weighted average period of 2.09 years. During the three months ended March 31, 2022 and 2021, 0.7 million and 0.5 million shares of common stock were earned and either issued or deferred for future issuance in connection with PSUs. The approximate fair values of PSUs earned during the three months ended March 31, 2022 and 2021 were $72.4 million and $45.2 million. RSUs to be Settled in Cash During the three months ended March 31, 2022 and 2021, compensation expense related to RSUs to be settled in cash was $3.7 million and $4.9 million. Such expense is recorded in “Selling, general and administrative expenses.” RSUs that are anticipated to be settled in cash are not included in the calculation of weighted average shares outstanding for earnings per share, and the estimated earned value of such RSUs is classified as a liability. Quanta paid $8.6 million and $7.4 million to settle liabilities related to cash-settled RSUs in the three months ended March 31, 2022 and 2021. Accrued liabilities for the estimated earned value of outstanding RSUs to be settled in cash were $6.2 million and $11.1 million as of March 31, 2022 and December 31, 2021.

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