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STOCKHOLDERS' EQUITY - Additional equity disclosures (Details) - USD ($)		12 Months Ended
	Mar. 13, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity
Cash distributions declared per share of common stock (in dollars per share)	$ 0.45	$ 1.80	$ 1.80	$ 1.74
Quarterly cash dividend declared	$ 9,037,000	$ 35,663,000	$ 34,652,000	$ 32,391,000
Dividend Reinvestment Plan
Common shares issued under Dividend Reinvestment Plan		220,000	243,000	198,000
Shares Issued Through Equity Offering Program
Number of shares sold (in shares)		180,120	126,300
Proceeds from Issuance of Common Stock		$ 5,392,000	$ 3,245,000
Payment of commissions on sale of shares		54,000	33,000
Payment of Offering Costs on Sale of Shares		$ 192,000	$ 107,000
Maximum
Dividend Reinvestment Plan
Discount rate (as a percent)		5.00%	5.00%	5.00%

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