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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Restricted Stock Awards
The following table summarizes information about restricted stock awards for the six months ended June 30, 2021:
Restricted StockNumber of SharesWeighted Average
Grant-Date
Fair Value
Balance at January 1, 2021493,879 $59.74 
Granted51,354 87.86 
Vested(103,449)57.35 
Forfeited(32,321)58.87 
Balance at June 30, 2021409,463 63.94 
Schedule of Performance Stock Awards
The following table summarizes information about performance stock awards for the six months ended June 30, 2021:
Performance StockNumber of SharesWeighted Average
Grant-Date
Fair Value
Balance at January 1, 2021254,449 $61.75 
Granted5,897 86.15 
Vested(71,815)62.27 
Forfeited(20,003)61.54 
Balance at June 30, 2021168,528 62.41