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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of restricted stock awards
The following table summarizes information about restricted stock awards for the nine months ended September 30, 2016:
Restricted Stock
Number of Shares
 
Weighted Average
Grant-Date
Fair Value
Balance at January 1, 2016
362,618

 
$
55.79

Granted
335,992

 
$
50.87

Vested
(168,565
)
 
$
54.06

Forfeited
(46,298
)
 
$
53.04

Balance at September 30, 2016
483,747

 
$
53.23
Summary of performance stock awards
The following table summarizes information about performance stock awards for the nine months ended September 30, 2016:
Performance Stock
Number of Shares
 
Weighted Average
Grant-Date
Fair Value
Balance at January 1, 2016
187,274

 
$
57.13

Granted
207,624

 
$
54.21

Vested
(8,420
)
 
$
61.90

Forfeited
(33,469
)
 
$
55.96

Balance at September 30, 2016
353,009

 
$
55.39