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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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