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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016:
Restricted Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2016
362,618

 
$
55.79

Granted
393,492

 
50.57

Vested
(175,699
)
 
53.82

Forfeited
(70,370
)
 
54.24

Unvested at December 31, 2016
510,041

 
$
52.65
Schedule of Performance Stock Awards
The following table summarizes information about performance stock awards for the year ended December 31, 2016:
Performance Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2016
187,274

 
$
57.13

Granted
207,624

 
54.21

Vested
(19,981
)
 
60.34

Forfeited
(154,035
)
 
56.29

Unvested at December 31, 2016
220,882

 
$
54.69