BENEFIT PLANS - Other Deferred Compensation Arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangements [Abstract]
Deferred compensation arrangements (161,457 shares at December 31, 2020 and 179,548 shares at December 31, 2019)	$ 9,127	$ 10,120
Other Deferred Compensation Arrangements [Member]
Deferred Compensation Arrangements [Abstract]
Deferred compensation arrangements (161,457 shares at December 31, 2020 and 179,548 shares at December 31, 2019)	5,400	2,600
Expense recognized under plan	$ 400	$ 200	$ 80