ACQUISITIONS, Supplemental Pro Forma Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Pro Forma Financial Information [Abstract]
Acquisitions-related expenses	$ 8,000		$ 25,700
Total revenue, net of interest expense, pro forma	602,817	$ 594,174	546,977	$ 536,183
Net income, pro forma	$ 178,427	$ 167,914	$ 176,257	$ 109,186