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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of restricted stock awards | The following table summarizes information about restricted stock awards for the six months ended June 30, 2019:
Restricted Stock | Number of Shares |  | Weighted Average Grant-Date Fair Value
Balance at January 1, 2019 | 657,240 |  |  | $ | 54.65 |
Granted | 79,060 |  |  | 65.12 |
Vested | (207,032 | ) |  | 53.75 |
Forfeited | (48,166 | ) |  | 54.92 |
Balance at June 30, 2019 | 481,102 |  |  | 56.73 |
Summary of performance stock awards | The following table summarizes information about performance stock awards for the six months ended June 30, 2019:
Performance Stock | Number of Shares |  | Weighted Average Grant-Date Fair Value
Balance at January 1, 2019 | 213,490 |  |  | $ | 55.71 |
Granted | — |  |  | — |
Vested | (51,996 | ) |  | 55.77 |
Forfeited | (23,554 | ) |  | 55.64 |
Balance at June 30, 2019 | 137,940 |  |  | 55.69 |

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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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