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DEBT - Narrative (Details)
3 Months Ended 12 Months Ended
Apr. 21, 2015
USD ($)
Mar. 31, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Jan. 15, 2016
USD ($)
Dec. 31, 2015
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)   3.65% 3.69%        
Number of properties that served as collateral for loans | Property   46          
Long-term debt   $ 714,306,000 $ 652,414,000        
Secured and unsecured debt | Total term loans              
Debt Instrument [Line Items]              
Long-term debt   598,900,000          
Secured debt | Total term loans              
Debt Instrument [Line Items]              
Long-term debt   308,900,000          
Unsecured debt | $450 Million Senior Unsecured Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, face amount   450,000,000.0 450,000,000.0        
Maximum borrowing capacity   450,000,000.0   $ 450,000,000.0      
Line of credit outstanding   270,000,000.0          
Amount available for borrowing   180,000,000.0          
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      
Unsecured debt | $150 Million Term Loan              
Debt Instrument [Line Items]              
Debt instrument, face amount       $ 150,000,000.0      
Fixed interest rate (as a percent)   3.49%          
Unsecured debt | $300 Million Senior Unsecured Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity     300,000,000.0   $ 300,000,000.0    
Repayments of revolving credit facility   $ 225,000,000          
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  
Number of properties that served as collateral for loans | Property   46          
Amount drawn $ 15,000,000            
Debt instrument, effective interest rate   2.78%          
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   2.48%          
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%          
Fair Value              
Debt Instrument [Line Items]              
Debt with variable interest rates that had been converted to fixed interest rates   $ 75,000,000 $ 75,000,000