STOCKHOLDERS' EQUITY - Repurchase of Common Stock (Details) - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Number of shares authorized to be repurchased (in shares)	3,763,038
Aggregate number of shares repurchased since inception (in shares)	2,715,595
Number of shares remaining in treasury (in shares)	85,272		76,084
Number of shares acquired under stock repurchase plan and subsequently reissued (in shares)	147,199	63,729
Treasury stock acquired, average cost (in dollars per share)	$ 127.46	$ 93.87