STOCK-BASED COMPENSATION - Restricted Stock Unit Activity (Details)	6 Months Ended
	Jun. 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	140,316
Vested (in shares) | shares	(134,808)
Restricted stock units forfeited (in shares) | shares	(3,244)
Nonvested outstanding ending balance (in shares) | shares	578,462
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	139.25
Vested, Weighted average grant date fair value (in dollars per share) | $ / shares	91.39
Forfeited, Weighted average grant date fair value (in dollars per share) | $ / shares	99.42
Outstanding, Weighted average grant date fair value ending balance (in dollars per share) | $ / shares	$ 107.45
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	(71,994)
Restricted stock units forfeited (in shares) | shares	(31,872)
Nonvested outstanding ending balance (in shares) | shares	656,172
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	128.70
Forfeited, Weighted average grant date fair value (in dollars per share) | $ / shares	91.67
Outstanding, Weighted average grant date fair value ending balance (in dollars per share) | $ / shares	$ 111.10