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STOCKHOLDERS' EQUITY - Common Stock Dividend Distributions (Details) - USD ($)		12 Months Ended
	Mar. 11, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stockholders' Equity
Cash distributions declared per share of common stock (in dollars per share)	$ 0.45	$ 1.80	$ 1.74	$ 1.66
Quarterly cash dividend declared	$ 8,800,000	$ 34,652,000	$ 32,391,000	$ 29,136,000
Dividend Reinvestment Plan
Common shares issued under Dividend Reinvestment Plan		243,000	198,000	142,000
Shares Issued Through Equity Offering Program
Number of shares sold (in shares)		126,300	231,000
Proceeds from sale of shares, net of commission and before offering costs		$ 3,245,000	$ 5,758,000
Payment of commissions on sale of shares		33,000	58,000
Payment of Offering Costs on Sale of Shares		$ 107,000	$ 188,000
Maximum
Dividend Reinvestment Plan
Discount rate (as a percent)		5.00%

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Represents the percentage of discount from market price on common stock purchased through the dividend reinvestment plan.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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