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STOCK-BASED COMPENSATION - ACTIVITY OF NON-VESTED STOCK, OTHER THAN OPTIONS (Details) - LTIP
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Restricted Stock Units  
Units  
Non-vested, beginning of year (in shares) | shares 550,056
Granted (in shares) | shares 178,567
Vested (in shares) | shares (267,635)
Forfeited (in shares) | shares (23,586)
Non-vested, end of quarter (in shares) | shares 437,402
Weighted-Average Grant-Date Fair Value  
Non-vested, beginning of year (in dollars per share) | $ / shares $ 20.30
Granted (in dollars per share) | $ / shares 34.35
Vested (in dollars per share) | $ / shares 21.12
Forfeited (in dollars per share) | $ / shares 17.25
Non-vested, end of quarter (in dollars per share) | $ / shares $ 25.69
Performance Stock Units  
Units  
Non-vested, beginning of year (in shares) | shares 185,588
Granted (in shares) | shares 64,258
Vested (in shares) | shares 0
Forfeited (in shares) | shares 0
Non-vested, end of quarter (in shares) | shares 249,846
Weighted-Average Grant-Date Fair Value  
Non-vested, beginning of year (in dollars per share) | $ / shares $ 22.63
Granted (in dollars per share) | $ / shares 68.99
Vested (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 0
Non-vested, end of quarter (in dollars per share) | $ / shares $ 34.56
Performance Stock Units | Minimum  
Weighted-Average Grant-Date Fair Value  
Ratio at which award holders get common stock of the company 0
Performance Stock Units | Maximum  
Weighted-Average Grant-Date Fair Value  
Ratio at which award holders get common stock of the company 2