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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes, Earnings per Share and Unit and Derivatives (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 02, 2015 $ / £ | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) $ / £ shares | Dec. 31, 2015 USD ($) shares
Income Taxes |  |  |  |
Net tax basis in the entity's assets |  | $ 3,400.0 | $ 3,200.0 |
Percentage of distributions characterized as ordinary income dividends |  | 86.602% |  |
Percentage of distributions characterized as capital gain dividends |  | 12.903% |  |
Federal excise tax rate (as a percent) |  | 4.00% |  |
Percentage of ordinary income considered for the calculation of annual amount which is subject to federal excise tax |  | 85.00% |  |
Percentage of net capital gain considered for the calculation of annual amount which is subject to Federal excise tax |  | 95.00% |  |
Percentage of prior year taxable income considered for the calculation of annual amount which is subject to federal excise tax |  | 100.00% |  |
Net deferred tax asset recorded by REIT subsidiary TRS |  | $ 1.4 | $ 1.3 |
Earnings per Share and Unit |  |  |  |
Potential dilutive securities not included in the calculation of diluted earnings per share, as they were identified as anti-dilutive (in shares) | shares |  |  |  | 1,551,000
Potential dilutive securities included in the calculation of diluted earnings per share (in shares) | shares |  | 923,000 | 1,287,000 |
Foreign currency |  |  |  |
Foreign currency exchange rate (U.S. Dollars per pound) | $ / £ | 1.521600 |  |  |
Foreign currency average exchange rate (U.S. Dollars per pound) | $ / £ | 1.529755 |  | 1.529755 |
Realized gain (loss) on foreign currency translation |  |  |  | $ (1.2)
Interest rate swap | Designated | Cash flow |  |  |  |
Foreign currency |  |  |  |
Notional principal amounts |  | $ 100.0 | $ 300.0 |

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