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DEBT - Narrative (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Property
Apr. 21, 2015
USD ($)
Jun. 30, 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)     3.71% 3.69%        
Number of properties that served as collateral for loans | Property 36   36          
Long-term debt $ 735,206,000   $ 735,206,000 $ 652,414,000        
Secured and unsecured debt | Total term loans                
Debt Instrument [Line Items]                
Long-term debt 589,400,000   589,400,000          
Secured debt | Non-recourse Loan | Metabank                
Debt Instrument [Line Items]                
Debt instrument, face amount $ 47,600,000.0   $ 47,600,000.0          
Fixed interest rate (as a percent) 4.44%   4.44%          
Amount of total loan commitment must be drawn within 90 days of closing $ 25,000,000.0   $ 25,000,000.0          
Debt instrument, interest only payments term 18 months              
Debt instrument, amortization period after interest only payments period 25 years              
Secured debt | Total term loans                
Debt Instrument [Line Items]                
Long-term debt $ 299,400,000   299,400,000          
Unsecured debt | $450 Million Senior Unsecured Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, face amount 450,000,000.0   450,000,000.0 450,000,000.0        
Maximum borrowing capacity 450,000,000.0   450,000,000.0   $ 450,000,000.0      
Line of credit outstanding 300,000,000   300,000,000          
Amount available for borrowing 150,000,000   150,000,000          
Maximum increase in borrowing capacity available through accordion feature option $ 150,000,000.0   $ 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%   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             $ 75,000,000.0  
Debt instrument, effective interest rate 3.03%   3.03%          
Number of properties that served as collateral for loans | Property 36   36          
Amount drawn   $ 15,000,000            
Mortgage loans                
Debt Instrument [Line Items]                
Repayment of mortgage loan $ 7,500,000              
Prepayment penalties     $ 0          
Designated as hedges | Interest rate swaps                
Debt Instrument [Line Items]                
Derivative notional amount $ 75,000,000   $ 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
Designated as hedges | Cash flow hedges | Interest rate swaps | LIBOR                
Debt Instrument [Line Items]                
Fixed interest rate (as a percent) 2.04%   2.04%          
Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, effective interest rate 2.73%   2.73%          
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 $ 75,000,000