Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS - Narrative (Details)

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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unrealized losses forecasted to be included in earnings transferred from AOCI in the next twelve months $ 1.6  
Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed rate mortgages, fair value 201.7 $ 176.9
Level 2 [Member] | Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed rate mortgages, fair value $ 214.0 $ 189.3
Weighted average market interest rate 3.89% 3.41%
Weighted average contractual interest rate 5.25% 5.10%
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notional amount $ 425.0 $ 199.4
Weighted average remaining term 3 years 9 months  
Weighted average fixed rate 1.34%