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STOCKHOLDERS' EQUITY - Common Stock Dividend Distributions (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 11, 2017 | Mar. 20, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stockholders' Equity |  |  |  |  |
Cash distributions declared per share of common stock (in dollars per share) |  |  | $ 1.66 | $ 1.58 | $ 1.50
Common shares issued under the Distribution Reinvestment Plan |  |  | 142,000 | 197,000 | 227,000
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement |  | $ 38,360,000 |  |  |
Number of shares sold (in shares) | 27,800 |  | 1,079,862 | 295,190 |
Proceeds from sale of shares, net of commission and before offering costs | $ 692,000 |  | $ 25,947,000 | $ 6,581,000 |
Payment of commissions on sale of shares | $ 7,000 |  | 262,000 | 66,000 |
Payment of Offering Costs on Sale of Shares |  |  | $ 160,000 | $ 124,000 |
Maximum |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Discount rate (as a percent) |  |  | 5.00% |  |

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