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STOCK-BASED COMPENSATION - Performance Shares Issued to Non-employees (Details) - Performance Shares - $ / shares
shares in Thousands
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Shares (000's)    
Unvested at beginning of period (in shares) 76 15
Granted (in shares) 0 76
Vested (in shares) (31) (18)
Forfeited and cancelled (in shares) (4) 0
Unvested at end of period (in shares) 41 73
Weighted Average Grant Date Fair Value    
Unvested at beginning of period (in USD per share) $ 91.48 $ 64.65
Granted (in USD per share) 0 102.92
Vested (in USD per share) 98.28 96.47
Forfeited and cancelled (in USD per share) 74.62 0
Unvested at end of period (in USD per share) $ 91.36 $ 96.47