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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of restricted stock awards | The following table summarizes information about restricted stock awards for the nine months ended September 30, 2019:
Restricted Stock | Number of Shares |  | Weighted Average Grant-Date Fair Value
Balance at January 1, 2019 | 657,240 |  |  | $ | 54.65 |
Granted | 168,261 |  |  | 68.39 |
Vested | (230,214 | ) |  | 53.97 |
Forfeited | (53,458 | ) |  | 55.27 |
Balance at September 30, 2019 | 541,829 |  |  | 59.14 |
Summary of performance stock awards | The following table summarizes information about performance stock awards for the nine months ended September 30, 2019:
Performance Stock | Number of Shares |  | Weighted Average Grant-Date Fair Value
Balance at January 1, 2019 | 213,490 |  |  | $ | 55.71 |
Granted | 121,075 |  |  | 70.53 |
Vested | (51,996 | ) |  | 55.77 |
Forfeited | (27,308 | ) |  | 56.53 |
Balance at September 30, 2019 | 255,261 |  |  | 62.64 |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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