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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of restricted stock awards
The following table summarizes information about restricted stock awards for the three months ended March 31, 2020:
Restricted Stock
Number of Shares
 
Weighted Average
Grant-Date
Fair Value
Balance at January 1, 2020
522,597

 
$
59.57

Granted
9,316

 
80.07

Vested
(66,779
)
 
55.09

Forfeited
(3,009
)
 
61.85

Balance at March 31, 2020
462,125

 
60.62
Summary of performance stock awards
The following table summarizes information about performance stock awards for the three months ended March 31, 2020:
Performance Stock
Number of Shares
 
Weighted Average
Grant-Date
Fair Value
Balance at January 1, 2020
204,553

 
$
64.78

Granted
—

 
—

Vested
(23,222
)
 
55.75

Forfeited
(1,854
)
 
64.13

Balance at March 31, 2020
179,477

 
65.95