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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