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Stock-Based Compensation Plans | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation Plans | Stock-Based Compensation Plans Employee Stock Purchase Plan Shares issued under the 2017 Employee Stock Purchase Plan during the six months ended June 30, 2021 and 2020, totaled 55,486 and 72,228, respectively. Stock Options A summary of stock option activity is as follows:
| Number of Shares |  | Weighted Average Exercise Price ($) |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value of In-the-Money Options ($)
Outstanding as of December 31, 2020 | 2,186,511 |  |  | $ | 17.87 |  |  |  |  |
Exercised | (369,103) |  |  | 19.09 |  |  |  |  |
Outstanding as of June 30, 2021 | 1,817,408 |  |  | $ | 17.63 |  |  | 3.57 |  | $ | 35,460,553 |
Exercisable as of June 30, 2021 | 1,817,408 |  |  | $ | 17.63 |  |  | 3.57 |  | $ | 35,460,553 |
The total intrinsic value of stock options exercised during the six months ended June 30, 2021 and 2020, was $7.6 million and $10.5 million, respectively. There were no stock options granted during the six months ended June 30, 2021 or 2020. Long-term Incentive Program Performance Share Awards During the six months ended June 30, 2021, the Company modified the performance target for the remaining outstanding long-term incentive program performance shares ("LTIP performance shares") in consideration of the impact of the COVID-19 pandemic, resulting in additional stock-based compensation expense of approximately $0.4 million. During the six months ended June 30, 2021, a total of 10,457 LTIP performance shares vested. The Company withheld 4,527 of those shares to pay the employees’ portion of the minimum payroll withholding taxes. Total Shareholder Return Awards A summary of nonvested total shareholder return awards ("TSRs") is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2020 | 1,367,728 |  |  | $ | 34.59 |
Granted | 367,317 |  |  | 50.60 |
Vested | (782,588) |  |  | 31.31 |
Forfeited | (83,519) |  |  | 37.18 |
Change in payout rate | 391,294 |  |  | 31.31 |
Nonvested as of June 30, 2021 | 1,260,232 |  |  | $ | 40.11 |
During the six months ended June 30, 2021, a total of 782,588 TSRs awards granted in fiscal 2018 vested and achieved a payout rate of 200% based on the Company's total shareholder return as compared to a group of peer companies over a three-year performance period. The Company withheld 205,373 of those shares to pay the employees’ portion of the minimum payroll withholding taxes. The fair value of TSRs granted during the six months ended June 30, 2021 and 2020, were estimated on the date of grant using the Monte Carlo simulation model, acceptable under ASC 718, using the following weighted average assumptions:
| Six Months Ended June 30,
| 2021 |  | 2020
Expected life (years) | 2.8 |  | 2.8
Risk-free interest rate | 0.3 | % |  | 0.5 | %
Expected volatility | 41.2 | % |  | 31.4 | %
Expected dividend yield | — |  |  | — |
Restricted Share Units A summary of nonvested restricted share unit awards ("RSUs") is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2020 | 1,118,182 |  |  | $ | 27.34 |
Granted | 578,220 |  |  | 39.27 |
Vested | (518,350) |  |  | 27.66 |
Forfeited | (149,623) |  |  | 29.38 |
Nonvested as of June 30, 2021 | 1,028,429 |  |  | $ | 33.59 |
During the six months ended June 30, 2021, a total of 518,350 RSUs vested. The Company withheld 153,845 of those shares to pay the employees’ portion of the minimum payroll withholding taxes. As of June 30, 2021, there were unrecognized compensation costs of $29.9 million and $26.7 million related to nonvested RSUs and TSRs, respectively, which the Company expects to recognize over weighted average periods of 2.1 years and 2.2 years. The Company recorded stock-based compensation expense recognized under ASC 718 for the three months ended June 30, 2021 and 2020, of $7.7 million and $7.9 million, respectively, with corresponding tax benefits of $1.2 million and $1.4 million, respectively. The Company recorded stock-based compensation expense recognized under ASC 718 for the six months ended June 30, 2021 and 2020, of $14.4 million and $14.9 million, respectively, with corresponding tax benefits of $2.2 million and $2.8 million, respectively.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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