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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock
The following table summarizes information about restricted stock awards for the year ended December 31, 2018:
Restricted Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2018
604,933

 
$
54.23

Granted
327,466

 
55.02

Vested
(198,673
)
 
54.22

Forfeited
(76,486
)
 
54.00

Unvested at December 31, 2018
657,240

 
$
54.65
Schedule of Performance Stock Awards
The following table summarizes information about performance stock awards for the year ended December 31, 2018:
Performance Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2018
190,129

 
$
55.63

Granted
171,584

 
55.71

Vested
(21,416
)
 
54.82

Forfeited
(126,807
)
 
53.59

Unvested at December 31, 2018
213,490

 
$
55.71