STOCK-BASED COMPENSATION - Restricted Stock Unit Activity (Details)	3 Months Ended
	Mar. 31, 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	128,297
Vested (in shares) | shares	(118,349)
Restricted stock units forfeited (in shares) | shares	(2,785)
Nonvested outstanding ending balance (in shares) | shares	583,361
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	137.97
Vested, Weighted average grant date fair value (in dollars per share) | $ / shares	89.95
Forfeited, Weighted average grant date fair value (in dollars per share) | $ / shares	95.77
Outstanding, Weighted average grant date fair value ending balance (in dollars per share) | $ / shares	$ 106.33
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	169,268
Vested (in shares) | shares	(71,994)
Restricted stock units forfeited (in shares) | shares	(31,338)
Nonvested outstanding ending balance (in shares) | shares	656,000
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	152.47
Vested, Weighted average grant date fair value (in dollars per share) | $ / shares	128.70
Forfeited, Weighted average grant date fair value (in dollars per share) | $ / shares	91.23
Outstanding, Weighted average grant date fair value ending balance (in dollars per share) | $ / shares	$ 111.05