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DEBT - Additional (Details)
3 Months Ended 12 Months Ended
Apr. 21, 2015
USD ($)
Mar. 31, 2016
USD ($)
Property
Dec. 31, 2015
USD ($)
Apr. 21, 2016
USD ($)
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)   3.76% 3.90%        
Debt instrument, effective interest rate   2.13%          
Number of properties that served as collateral for loans | Property   44          
Long-term debt   $ 697,298,000 $ 671,536,000        
$150 Million Term Loan              
Debt Instrument [Line Items]              
Fixed interest rate (as a percent)   3.64%          
Secured and unsecured debt | Total term loans              
Debt Instrument [Line Items]              
Long-term debt   $ 649,100,000          
Secured debt | Total term loans              
Debt Instrument [Line Items]              
Long-term debt   359,100,000          
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     $ 450,000,000.0    
Line of credit outstanding   205,000,000.0          
Amount available for borrowing   245,000,000.0          
Debt principal balance transferred   170,000,000          
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         $ 150,000,000.0    
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        
Line of credit outstanding   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]              
Maximum increase in borrowing capacity available through accordion feature option           $ 75,000,000  
Unsecured debt | 2015 Term Loan              
Debt Instrument [Line Items]              
Debt instrument, face amount           $ 125,000,000  
Debt instrument, effective interest rate   2.43%          
Amount drawn $ 15,000,000            
Option One | Minimum | LIBOR              
Debt Instrument [Line Items]              
Debt basis spread on variable rate   1.50%          
Option One | Maximum | LIBOR              
Debt Instrument [Line Items]              
Debt basis spread on variable rate   2.25%          
Option Two | LIBOR              
Debt Instrument [Line Items]              
Debt basis spread on variable rate   1.00%          
Option Two | Federal Funds Rate              
Debt Instrument [Line Items]              
Debt basis spread on variable rate   0.50%          
Option Two | Minimum              
Debt Instrument [Line Items]              
Debt instrument, base rate margin   0.50%          
Option Two | Maximum              
Debt Instrument [Line Items]              
Debt instrument, base rate margin   1.25%          
Subsequent Event | Unsecured debt | 2015 Term Loan              
Debt Instrument [Line Items]              
Accordion feature additional commitment       $ 15,000,000      
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%