STOCK-BASED COMPENSATION - Restricted Stock Unit Activity (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Nonvested outstanding beginning balance (in shares) | shares	576,198
RSU's granted (in shares) | shares	143,807
Vested (in shares) | shares	(220,723)
Restricted stock units forfeited (in shares) | shares	(3,918)
Nonvested outstanding ending balance (in shares) | shares	495,364
Weighted Average Grant Date Fair Value
Outstanding, Weighted average grant date fair value begging balance (in dollars per share) | $ / shares	$ 92.47
Granted, Weighted average grant date fair value (in dollars per share) | $ / shares	138.89
Vested, Weighted average grant date fair value (in dollars per share) | $ / shares	96.13
Forfeited, Weighted average grant date fair value (in dollars per share) | $ / shares	102.54
Outstanding, Weighted average grant date fair value ending balance (in dollars per share) | $ / shares	$ 108.36
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Nonvested outstanding beginning balance (in shares) | shares	590,064
RSU's granted (in shares) | shares	169,974
Vested (in shares) | shares	(72,139)
Restricted stock units forfeited (in shares) | shares	(32,561)
Nonvested outstanding ending balance (in shares) | shares	655,338
Weighted Average Grant Date Fair Value
Outstanding, Weighted average grant date fair value begging balance (in dollars per share) | $ / shares	$ 100.27
Granted, Weighted average grant date fair value (in dollars per share) | $ / shares	152.51
Vested, Weighted average grant date fair value (in dollars per share) | $ / shares	128.66
Forfeited, Weighted average grant date fair value (in dollars per share) | $ / shares	92.26
Outstanding, Weighted average grant date fair value ending balance (in dollars per share) | $ / shares	$ 111.09