Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Narrative (Details)

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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Apr. 24, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notional amount     $ 100.0
Estimated unrealized losses to be reclassified from AOCI to earnings in the next twelve months $ 2.8    
Level 2 | Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 285.0 $ 276.5  
Weighted average market interest rate (percent) 3.11% 4.17%  
Weighted average contractual interest rate (percent) 4.84% 4.85%  
Designated as Hedging Instrument | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notional amount $ 1,125.0 $ 795.0  
Weighted average remaining term 4 years 6 months    
Weighted average fixed rate (percent) 1.90%    
Reported Value Measurement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fixed rate mortgages, fair value disclosure $ 264.3 $ 268.1