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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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