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DEBT - Additional (Details)
9 Months Ended 12 Months Ended
Apr. 21, 2015
USD ($)
Sep. 30, 2016
USD ($)
Property
Dec. 31, 2015
USD ($)
Jan. 15, 2016
USD ($)
Apr. 07, 2015
USD ($)
Sep. 05, 2013
USD ($)
Debt Instrument [Line Items]            
Weighted average interest rate for all borrowings, after giving effect to interest rate derivatives (as a percent)   3.67% 3.90%      
Number of properties that served as collateral for loans | Property   46        
Long-term debt   $ 618,892,000 $ 671,536,000      
$150 Million Term Loan            
Debt Instrument [Line Items]            
Fixed interest rate (as a percent)   3.49%        
Secured and unsecured debt | Total term loans            
Debt Instrument [Line Items]            
Long-term debt   $ 609,600,000        
Secured debt | Total term loans            
Debt Instrument [Line Items]            
Long-term debt   319,600,000        
Unsecured debt | $450 Million Senior Unsecured Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount   450,000,000.0        
Maximum borrowing capacity   450,000,000.0   $ 450,000,000    
Line of credit outstanding   165,000,000.0        
Amount available for borrowing   285,000,000.0        
Maximum increase in borrowing capacity available through accordion feature option   150,000,000.0        
Unsecured debt | $300 Million Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount       300,000,000.0    
Unsecured debt | $150 Million Term Loan            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 150,000,000    
Unsecured debt | $300 Million Senior Unsecured Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount     300,000,000.0      
Maximum borrowing capacity     300,000,000.0      
Line of credit outstanding   $ 170,000,000 170,000,000      
Amount available for borrowing     130,000,000      
Unsecured debt | $225 Million Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, face amount     225,000,000      
Unsecured debt | $75 Million Term Loan            
Debt Instrument [Line Items]            
Debt instrument, face amount     75,000,000      
Unsecured debt | 2015 Term Loan            
Debt Instrument [Line Items]            
Debt instrument, face amount         $ 125,000,000  
Maximum increase in borrowing capacity available through accordion feature option         $ 75,000,000  
Accordion feature additional commitment $ 15,000,000          
Amount drawn $ 15,000,000          
Debt instrument, effective interest rate   2.33%        
Designated as hedges | Interest rate swaps            
Debt Instrument [Line Items]            
Derivative notional amount   $ 75,000,000 $ 75,000,000      
Designated as hedges | Cash flow hedges | Interest rate swaps            
Debt Instrument [Line Items]            
Derivative notional amount           $ 75,000,000.0
Fixed interest rate (as a percent)   2.04%        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt instrument, effective interest rate   2.03%        
Revolving Credit Facility | Option One | Minimum | LIBOR            
Debt Instrument [Line Items]            
Debt basis spread on variable rate   1.50%        
Revolving Credit Facility | Option One | Maximum | LIBOR            
Debt Instrument [Line Items]            
Debt basis spread on variable rate   2.25%        
Revolving Credit Facility | Option Two | LIBOR            
Debt Instrument [Line Items]            
Debt basis spread on variable rate   1.00%        
Revolving Credit Facility | Option Two | Federal Funds Rate            
Debt Instrument [Line Items]            
Debt basis spread on variable rate   0.50%        
Revolving Credit Facility | Option Two | Minimum            
Debt Instrument [Line Items]            
Debt instrument, base rate margin   0.50%        
Revolving Credit Facility | Option Two | Maximum            
Debt Instrument [Line Items]            
Debt instrument, base rate margin   1.25%