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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of restricted stock awards | The following table summarizes information about restricted stock awards for the three months ended March 31, 2020:
Restricted Stock | Number of Shares |  | Weighted Average Grant-Date Fair Value
Balance at January 1, 2020 | 522,597 |  |  | $ | 59.57 |
Granted | 9,316 |  |  | 80.07 |
Vested | (66,779 | ) |  | 55.09 |
Forfeited | (3,009 | ) |  | 61.85 |
Balance at March 31, 2020 | 462,125 |  |  | 60.62 |
Summary of performance stock awards | The following table summarizes information about performance stock awards for the three months ended March 31, 2020:
Performance Stock | Number of Shares |  | Weighted Average Grant-Date Fair Value
Balance at January 1, 2020 | 204,553 |  |  | $ | 64.78 |
Granted | — |  |  | — |
Vested | (23,222 | ) |  | 55.75 |
Forfeited | (1,854 | ) |  | 64.13 |
Balance at March 31, 2020 | 179,477 |  |  | 65.95 |

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