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EQUITY - Narrative (Details) |  |  |  | 6 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 20, 2018 USD ($) $ / shares shares | May 15, 2017 USD ($) | May 09, 2017 $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) shares | May 25, 2017 USD ($) $ / shares shares | Dec. 31, 2017 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  |  | 500,000,000 |  |  | 500,000,000
Common stock, par value (in dollars per share) |  |  |  | $ 0.01 |  |  | $ 0.01
Shares issued during stock offering (in shares) | shares |  |  |  | 0 | 10,350,000 |  |
Net proceeds from public shares offering | $ |  |  |  |  | $ 163,670,000 |  |
Payments of stock issuance costs | $ |  |  |  | $ 100,000 |  |  |
Compensation entitled as percentage of gross proceeds of shares sold under sales agreements |  |  |  | 2.00% |  |  |
Preferred stock, shares authorized | shares |  |  |  | 100,000,000 |  |  | 100,000,000
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.01 |  |  | $ 0.01
Undesignated preferred stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized | shares |  |  |  | 90,600,000 |  |  |
9.25% Series A Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  | $ 25 |  |  |
7.875% Series B Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  | 25 |  |  |
7.125% Series C Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  | 7.125%
Payments for repurchase of redeemable preferred shares | $ | $ 85,300,000 |  |  |  |  |  |
Preferred stock, shares outstanding | shares | 3,400,000 |  |  |  |  |  | 3,400,000
Preferred stock, redemption price (in dollars per share) | $ 25 |  |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  | $ 25 |  |  |
6.45% Series D Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized | shares |  |  |  | 3,000,000 |  |  |
Preferred stock, dividend rate |  |  |  | 6.45% |  |  | 6.45%
Preferred stock, shares outstanding | shares |  |  |  | 3,000,000 |  |  | 3,000,000
Preferred stock, liquidation preference (in dollars per share) |  |  |  | $ 25 |  |  |
Annual dividend rate per share (in dollars per share) |  |  |  | $ 1.6125 |  |  |
6.45% Series D Preferred Stock | Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Ratio for conversion |  |  |  | 3.9216 |  |  |
6.25% Series E Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized | shares |  |  |  | 6,400,000 |  |  |
Preferred stock, dividend rate |  |  |  | 6.25% |  |  | 6.25%
Preferred stock, shares outstanding | shares |  |  |  | 6,400,000 |  |  | 6,400,000
Preferred stock, liquidation preference (in dollars per share) |  |  |  | $ 25 |  |  |
Annual dividend rate per share (in dollars per share) |  |  |  | $ 1.5625 |  |  |
6.25% Series E Preferred Stock | Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Ratio for conversion |  |  |  | 3.1686 |  |  |
Operating partnership | Non-controlling Interests in Operating Partnership |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of common units of operating partnership owned by unaffiliated third parties (in shares) | shares |  |  |  | 297,552 |  |  | 323,391
Percentage of limited partnership interest in operating partnership (less than) |  |  |  | 1.00% |  |  | 1.00%
Underwriting Agreement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.01 |  |  |  |
Shares issued during stock offering (in shares) | shares |  |  | 9,000,000 |  |  |  |
Public offering price (in dollars per share) |  |  | $ 16.50 |  |  |  |
Underwriting discount (in dollars per share) |  |  | $ 0.66 |  |  |  |
Number of days option for underwriters to purchase common stock on same terms |  |  | 30 days |  |  |  |
Number of additional shares for underwriters to purchase | shares |  |  | 1,350,000 |  |  |  |
Net proceeds from public shares offering | $ |  | $ 163,800,000 |  |  |  |  |
Underwriting discount and offering-related expenses | $ |  | $ 7,000,000 |  |  |  |  |
2017 ATM Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  | $ 0.01 |
Common stock, shares authorized, amount | $ |  |  |  |  |  | $ 200,000,000 |
2016 ATM Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued during stock offering (in shares) | shares |  |  |  |  |  | 6,151,514 |
Net proceeds from public shares offering | $ |  |  |  |  |  | $ 89,100,000 |
Unaffiliated Third Parties | Operating partnership |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Limited partner capital account units conversion ratio |  |  |  | 1 |  |  |

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