INCENTIVE STOCK PLANS - Schedule of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Number of Shares
Options outstanding, beginning balance (in shares) | shares	414,402
Granted (in shares) | shares	0
Exercised (in shares) | shares	(50,228)
Cancelled or expired (in shares) | shares	(23,189)
Options outstanding, ending balance (in shares) | shares	340,985
Options exercisable (in shares) | shares	340,985
Weighted Average Exercise Price (per common share)
Options outstanding, beginning balance (in dollars per common share), Beginning Balance | $ / shares	$ 33.30
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	27.23
Cancelled or expired (in dollars per share) | $ / shares	35.08
Options outstanding, ending balance (in dollars per common share), Ending Balance | $ / shares	34.07
Options exercisable (in dollars per common share), Options exercisable | $ / shares	$ 34.07
Weighted Average Remaining Contractual Term (in years) and Options outstanding
Weighted Average Remaining Contractual term (in years), Options outstanding	2 years 2 months 12 days
Weighted Average Remaining Contractual term (in years), Options exercisable	2 years 2 months 12 days
Aggregate Intrinsic Value, Options outstanding | $	$ 5
Aggregate Intrinsic Value, Options exercisable | $	$ 5