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STOCK-BASED COMPENSATION | 9 Months Ended
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Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION On June 3, 2020, our shareholders approved the Clean Harbor's Inc. 2020 Stock Incentive Plan (the "2020 Plan"), which became effective on that date. The 2020 Plan provides for future awards of up to 2.5 million shares of the Company’s common stock (subject to certain anti-dilution adjustments) in the form of stock options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards. The 2020 Plan is administered by the Compensation Committee of the Company’s Board of Directors. The Company's previous stock incentive plan (the "2010 Plan") expired on May 10, 2020. In connection with the adoption of the 2020 Plan, no further awards will be made under the 2010 Plan. Total stock-based compensation cost charged to selling, general and administrative expenses for the three and nine months ended September 30, 2020 was $6.7 million and $12.7 million, respectively. Total stock-based compensation cost charged to selling, general and administrative expenses for the three and nine months ended September 30, 2019 was $5.0 million and $14.7 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation expense for the three and nine months ended September 30, 2020 was $1.7 million and $2.9 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation expense for the three and nine months ended September 30, 2019 was $1.0 million and $2.8 million, respectively. Restricted Stock Awards The following table summarizes information about restricted stock awards for the nine months ended September 30, 2020:
Restricted Stock | Number of Shares |  | Weighted Average Grant-Date Fair Value
Balance at January 1, 2020 | 522,597 |  |  | $ | 59.57 |
Granted | 205,548 |  |  | 58.54 |
Vested | (199,476) |  |  | 57.59 |
Forfeited | (38,515) |  |  | 58.81 |
Balance at September 30, 2020 | 490,154 |  |  | 60.01 |
As of September 30, 2020, there was $22.0 million of total unrecognized compensation cost arising from restricted stock awards. This cost is expected to be recognized over a weighted average period of 2.8 years. The total fair value of restricted stock vested during the three and nine months ended September 30, 2020 was $3.1 million and $12.8 million, respectively. The total fair value of restricted stock vested during the three and nine months ended September 30, 2019 was $4.2 million and $15.3 million, respectively. Performance Stock Awards Performance stock awards are subject to performance criteria established by the Compensation Committee of the Company's Board of Directors prior to or at the date of grant. The vesting of the performance stock awards is based on achieving targets typically based on revenue, Adjusted EBITDA margin, Adjusted Free Cash Flow and Total Recordable Incident Rate. In addition, performance stock awards include continued service conditions. The following table summarizes information about performance stock awards for the nine months ended September 30, 2020:
Performance Stock | Number of Shares |  | Weighted Average Grant-Date Fair Value
Balance at January 1, 2020 | 204,553 |  |  | $ | 64.78 |
Granted | 161,610 |  |  | 58.30 |
Vested | (23,222) |  |  | 55.75 |
Forfeited | (16,330) |  |  | 64.59 |
Balance at September 30, 2020 | 326,611 |  |  | 62.22 |
As of September 30, 2020, there was $5.7 million of total unrecognized compensation cost arising from unvested performance stock awards deemed probable of vesting. No performance awards vested during the three months ended September 30, 2020 and September 30, 2019. The total fair value of performance awards vested during the nine months ended September 30, 2020 and September 30, 2019 was $1.3 million and $2.9 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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