STOCK-BASED COMPENSATION - NON-OPTIONS (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2021
Other stock-based compensation
Contractual term of awards	10 years
Minimum
Other stock-based compensation
Continuous service period for awards to vest	1 year
Maximum
Other stock-based compensation
Continuous service period for awards to vest	3 years
SSARs
Non-vested other than stock options, number of shares
Outstanding at the beginning of the period (in shares)	157,279
Exercised (in shares)	(28,893)
Outstanding at the end of the period (in shares)	128,386	157,279
Exercisable at the end of the period (in shares)	128,386
Other than stock options, weighted-average grant date fair value
Non-vested at the beginning of the period (in dollars per share)	$ 113.03
Exercised (in dollars per share)	86.21
Non-vested at the end of the period (in dollars per share)	119.06	$ 113.03
Exercisable at the end of the period (in dollars per share)	$ 119.06
Other than stock options, weighted-average remaining contractual life (in years)
Outstanding at the end of the period	4 years 7 months 6 days
Exercisable at the end of the period	4 years 7 months 6 days
Aggregate Intrinsic Value
Intrinsic value on outstanding shares	$ 2,083
Intrinsic value on exercisable shares	2,083
Other stock-based compensation
Total intrinsic value	$ 1,400	$ 700	$ 200
Performance stock
Non-vested other than stock options, number of shares
Outstanding at the beginning of the period (in shares)	216,191
Granted (in shares)	93,840
Exercised (in shares)	(30,290)
Non-attainment (in shares)	(56,303)
Forfeited (in shares)	(1,980)
Outstanding at the end of the period (in shares)	221,458	216,191
Other than stock options, weighted-average grant date fair value
Non-vested at the beginning of the period (in dollars per share)	$ 135.11
Granted (in dollars per share)	99.75
Exercised (in dollars per share)	123.35
Non-attainment (in dollars per share)	124.69
Forfeited (in dollars per share)	148.89
Non-vested at the end of the period (in dollars per share)	$ 124.26	$ 135.11
Other stock-based compensation
Earn out basis if no goals are met (as a percent)				0.00%
Earn out basis if some goals are met (as a percent)				100.00%
Earn out basis if all goals are met (as a percent)	200.00%			200.00%
Total Shareholder Return Shares
Other stock-based compensation
Contractual term of awards	3 years			3 years
Continuous service period for awards to vest	3 years			3 years
Earn out basis if no goals are met (as a percent)	0.00%
Earn out basis if some goals are met (as a percent)	100.00%
Earn out basis if all goals are met (as a percent)	200.00%
Gold Equivalent Ounces Shares
Other stock-based compensation
Contractual term of awards				5 years
Restricted stock
Non-vested other than stock options, number of shares
Outstanding at the beginning of the period (in shares)	136,113
Granted (in shares)	65,850
Vested (in shares)	(51,110)
Forfeited (in shares)	(4,907)
Outstanding at the end of the period (in shares)	145,946	136,113
Other than stock options, weighted-average grant date fair value
Non-vested at the beginning of the period (in dollars per share)	$ 118.84
Granted (in dollars per share)	105.65
Vested (in dollars per share)	121.05
Forfeited (in dollars per share)	118.53
Non-vested at the end of the period (in dollars per share)	$ 112.13	$ 118.84
Restricted stock | Officers and Certain Employees
Non-vested other than stock options, number of shares
Granted (in shares)	57,330
Other stock-based compensation
Vesting period	3 years	3 years	3 years
Restricted stock | Non Executive Directors
Non-vested other than stock options, number of shares
Granted (in shares)	8,520
Other stock-based compensation
Vesting period	1 year
Vesting (as a percent)	50.00%
Percentage of shares granted to non-executive directors, vesting one year after date of grant	50.00%