STOCKHOLDERS' EQUITY - Repurchase of Common Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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)	2,431,767
Treasury stock (in shares)	203,879	706
Number of shares acquired under the stock repurchase plan and subsequently reissued (in shares)	240,995	16,755	23,182
Treasury stock acquired, average cost (in dollars per share)	$ 88.47	$ 83.08	$ 82.19