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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2017
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 three months ended March 31, 2017:
Restricted Stock
Number of Shares
 
Weighted Average
Grant-Date
Fair Value
Balance at January 1, 2017
510,041

 
$
52.65

Granted
22,794

 
$
55.64

Vested
(26,963
)
 
$
54.45

Forfeited
(29,218
)
 
$
50.97

Balance at March 31, 2017
476,654

 
$
52.80
Summary of performance stock awards
The following table summarizes information about performance stock awards for the three months ended March 31, 2017:
Performance Stock
Number of Shares
 
Weighted Average
Grant-Date
Fair Value
Balance at January 1, 2017
220,882

 
$
54.69

Granted
588

 
$
54.44

Vested
(25,168
)
 
$
54.84

Forfeited
(13,398
)
 
$
56.26

Balance at March 31, 2017
182,904

 
$
54.69