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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017:
Restricted Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2017
510,041

 
$
52.65

Granted
307,455

 
55.93

Vested
(136,787
)
 
53.16

Forfeited
(75,776
)
 
52.46

Unvested at December 31, 2017
604,933

 
$
54.23
Schedule of Performance Stock Awards
The following table summarizes information about performance stock awards for the year ended December 31, 2017:
Performance Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2017
220,882

 
$
54.69

Granted
170,897

 
55.87

Vested
(53,096
)
 
55.60

Forfeited
(148,554
)
 
57.14

Unvested at December 31, 2017
190,129

 
$
55.63