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SUMMARY OF NONVESTED PHANTOM STOCK UNITS (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Share-based Payment Arrangement [Abstract]  
Nonvested Units, Beginning balance 13,252
Nonvested Weighted Average Grant Date Fair Value, Beginning balance | $ / shares $ 72.61
Nonvested Units, Granted 2,412
Nonvested Weighted Average Grant Date Fair Value, Granted | $ / shares $ 146.06
Nonvested Units, Vested (5,792)
Nonvested Weighted Average Grant Date Fair Value, Vested | $ / shares $ 63.37
Nonvested Units, Forfeited
Nonvested Weighted Average Grant Date Fair Value, Forfeited | $ / shares
Nonvested Units, Canceled
Nonvested Weighted Average Grant Date Fair Value, Canceled | $ / shares
Nonvested Units, Ending Balance 9,872
Nonvested Weighted Average Grant Date Fair Value, Ending Balance | $ / shares $ 95.98
Phantom Stock Unit Awards Expected to Vest, Units 9,872
Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value 95.98