CAPITAL STOCK AND SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Employee Stock Purchase Plan Activity

The following is a detail of the purchases that were made under the plan:

Employee Stock Purchase Plan Period	Shares Issued	Price
2019 and Prior	3,151,673	$	16.81
January 1, 2020 to March 31, 2020	5,295	156.01
April 1, 2020 to June 30, 2020	5,414	168.76
July 1, 2020 to September 30, 2020	4,789	200.97
October 1, 2020 to December 31, 2020	4,202	249.33
January 1, 2021 to March 31, 2021	4,060	225.07
April 1, 2021 to June 30, 2021	5,095	208.19
July 1, 2021 to September 30, 2021	7,466	126.74
October 1, 2021 to December 31, 2021	7,161	137.60
	3,195,155

Schedule of Share-based Payment Award Valuation Assumptions

The fair values of the awards were estimated using the following assumptions for 2021, 2020 and 2019:

	For the Years Ended December 31,
	2021	2020	2019
Risk Free Rate	0.80% - 1.35%	0.38% - 1.51%	1.44% - 2.53%
Expected Volatility	39.84% - 41.40%	40.15% - 42.80%	42.46% - 43.83%
Expected Term	6.25 years	6.25 years	6.00 - 6.25 years
Weighted Average Fair Value	$107.45	$86.72	$54.42
Dividend Yield	—%	—%	—%

Schedule of Stock Options Activity

The following table presents our stock option activity for 2021:

	Number of Shares	Weighted Average Exercise Price		Weighted Average Contractual Life (Years)
Outstanding options at January 1, 2021	278,041	$	111.27	7.68
Granted	40,788	268.32
Exercised	(32,468)	63.28
Canceled, forfeited or expired	(12,388)	173.16
Outstanding options at December 31, 2021	273,973	$	137.54	7.21
Exercisable options at December 31, 2021	144,534	$	97.33	6.44

Schedule of Non-Vested Stock Unit Activity

The following table presents our service-based non-vested stock units activity for 2021:

	Number of  Shares	Weighted Average Grant Date Fair Value
Non-vested stock units at January 1, 2021	157,546	$	123.92
Granted	110,076	234.42
Vested	(75,446)	110.31
Canceled, forfeited or expired	(11,353)	149.60
Non-vested stock units at December 31, 2021	180,823	$	195.25

Schedule of Non-Vested Performance-based Units Activity

The following table presents our performance-based non-vested stock units activity for 2021:

	Number of  Shares	Weighted Average Grant Date Fair Value
Non-vested stock units at January 1, 2021	196,287	$	148.16
Granted	81,983	262.67
Vested	(79,736)	125.61
Canceled, forfeited or expired	(11,583)	174.41
Non-vested stock units at December 31, 2021	186,951	$	206.36

Shared-based Payment Arrangement, Non-vested Option, Activity

The following table presents our non-vested stock option activity for 2021:

	Number of Shares	Weighted Average Grant Date Fair Value
Non-vested stock options at January 1, 2021	188,612	$	56.55
Granted	40,788	268.32
Vested	(88,116)	106.75
Forfeited	(11,845)	171.25
Non-vested stock options at December 31, 2021	129,439	$	182.45