STOCK-BASED COMPENSATION - RSU and RSA Activity (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2017
RSUs
Nonvested RSUs and RSAs, Number of Shares
Nonvested at the beginning of the period (in shares)		194,686
Granted (in shares)		263,779
Vested (in shares)		(91,670)
Forfeited (in shares)		(58,727)
Nonvested at the end of the period (in shares)		308,068	194,686
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)		$ 289.82
Granted (in dollars per share)		209.25
Vested (in dollars per share)		289.63
Forfeited (in dollars per share)		260.13
Nonvested at the end of the period (in dollars per share)		$ 226.55	$ 289.82
Unrecognized compensation cost		$ 45,300,000
Weighted-average period for recognition of unrecognized compensation cost (in years)		1 year 9 months 18 days
Vested fair value		$ 21,700,000	$ 22,400,000	$ 27,200,000
Performance Shares
Nonvested RSUs and RSAs, Number of Shares
Nonvested at the beginning of the period (in shares)		6,328
Granted (in shares)		0	0	0
Vested (in shares)		(6,328)
Forfeited (in shares)		0
Nonvested at the end of the period (in shares)		0	6,328
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)		$ 223.90
Granted (in dollars per share)		0
Vested (in dollars per share)		223.90
Forfeited (in dollars per share)		0
Nonvested at the end of the period (in dollars per share)		$ 0	$ 223.90
Unrecognized compensation cost		$ 0
Vested fair value		$ 900,000	$ 2,600,000	$ 18,800,000
Performance-Based Restricted Stock
Nonvested RSUs and RSAs, Number of Shares
Nonvested at the beginning of the period (in shares)		23,804
Granted (in shares)		0	0	0
Vested (in shares)		(23,804)
Forfeited (in shares)		0
Nonvested at the end of the period (in shares)		0	23,804
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)		$ 340.25
Granted (in dollars per share)		0
Vested (in dollars per share)		340.25
Forfeited (in dollars per share)		0
Nonvested at the end of the period (in dollars per share)		$ 0	$ 340.25
Unrecognized compensation cost		$ 0
Vested fair value		$ 4,100,000	$ 6,200,000	$ 8,200,000
Grant date fair value						$ 21,900,000
Expiration period	6 months
Market-Based Restricted Stock
Nonvested RSUs and RSAs, Number of Shares
Nonvested at the beginning of the period (in shares)		26,674
Granted (in shares)		0	0	0
Vested (in shares)		0
Forfeited (in shares)		0
Nonvested at the end of the period (in shares)		26,674	26,674
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)		$ 340.25
Granted (in dollars per share)		0
Vested (in dollars per share)		0
Forfeited (in dollars per share)		0
Nonvested at the end of the period (in dollars per share)		$ 340.25	$ 340.25
Unrecognized compensation cost		$ 300,000
Weighted-average period for recognition of unrecognized compensation cost (in years)		9 months 18 days
Grant date fair value					$ 1,900,000
Return performance, percent of target stock price					110.00%
Maximum number of shares for earned (in shares)					44,545
Performance awards earned (in shares)		29,601
Minimum | Market-Based Restricted Stock
Nonvested RSUs and RSAs, Weighted Average Grant Date Fair Value
Return performance, percent of target stock price					70.00%