STOCKHOLDERS' EQUITY - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 5,406			$ 6,235			$ 16,869	$ 18,849
Income before income taxes	15,491			12,564			29,029	20,869
Provision (benefit) for income taxes	0			0			(112)	0
Net income	15,117	$ 12,113	$ 959	12,386	$ 11,915	$ (1,714)	28,189	22,587
Interest Rate Swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision (benefit) for income taxes							(112)
Interest rate swaps | Interest Rate Swaps | Amounts Reclassified Out of Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	1,156			30			2,513	(86)
Income before income taxes	1,156			30			2,513	(86)
Provision (benefit) for income taxes	0			0			(112)	0
Net income	$ 1,156			$ 30			$ 2,625	$ (86)