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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Restricted Stock
The following table summarizes information about restricted stock awards for the year ended December 31, 2019:
Restricted Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2019
657,240

 
$
54.65

Granted
174,114

 
68.82

Vested
(249,319
)
 
53.99

Forfeited
(59,438
)
 
55.65

Unvested at December 31, 2019
522,597

 
$
59.57
Schedule of Performance Stock Awards
The following table summarizes information about performance stock awards for the year ended December 31, 2019:
Performance Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2019
213,490

 
$
55.71

Granted
125,034

 
70.77

Vested
(105,583
)
 
55.68

Forfeited
(28,388
)
 
56.82

Unvested at December 31, 2019
204,553

 
$
64.78