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Mortgage Loans Payable and Unsecured Credit Facilities (Narrative) (Details)
12 Months Ended
Sep. 08, 2017
USD ($)
Loan
May 03, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 30, 2016
USD ($)
Apr. 26, 2016
USD ($)
Line Of Credit Facility [Line Items]              
Payments of early extinguishment of debt costs     $ 210,000 $ 2,623,000 $ 105,000    
Mortgage loan payable     582,994,000        
Number of amended and restated existing unsecured term loans | Loan 4            
Other assets and deferred charges, net     35,350,000 29,506,000      
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings     100,000        
Interest Rate Swap [Member]              
Line Of Credit Facility [Line Items]              
Interest rate swaps liability     500,000        
Derivative, notional amount     350,000,000     $ 350,000,000  
Cash Flow Hedging, Count 3 [Member] | Interest Rate Swap [Member]              
Line Of Credit Facility [Line Items]              
Other assets and deferred charges, net     $ 6,400,000        
Revolving Credit Facility [Member]              
Line Of Credit Facility [Line Items]              
Line of credit facility extension allowed period 1 year   1 year        
Basis spread on borrowings variable rate     1.35%        
Revolving Credit Facility [Member] | Minimum [Member]              
Line Of Credit Facility [Line Items]              
Basis spread on borrowings variable rate 1.35%            
Revolving Credit Facility [Member] | Maximum [Member]              
Line Of Credit Facility [Line Items]              
Basis spread on borrowings variable rate 1.95%            
Term loan facility [Member]              
Line Of Credit Facility [Line Items]              
Basis spread on borrowings variable rate     1.30%        
Term loan facility [Member] | Minimum [Member]              
Line Of Credit Facility [Line Items]              
Basis spread on borrowings variable rate 1.30%            
Term loan facility [Member] | Maximum [Member]              
Line Of Credit Facility [Line Items]              
Basis spread on borrowings variable rate 1.90%            
Secured Debt [Member]              
Line Of Credit Facility [Line Items]              
Mortgage loan payable     $ 18,839,000        
Secured Debt [Member] | Franklin Village Plaza [Member]              
Line Of Credit Facility [Line Items]              
Secured mortgage loan payable refinanced   $ 40,300,000          
Mortgage loan payable   $ 50,000,000          
Mortgage interest rate   3.90%          
Mortgage maturity date     Jun. 30, 2026        
Unsecured credit facility [Member]              
Line Of Credit Facility [Line Items]              
Credit facility borrowing capacity $ 300,000,000            
Aggregate borrowing capacity including increase under accordion feature 750,000,000            
Unsecured credit facility [Member] | Revolving Credit Facility [Member]              
Line Of Credit Facility [Line Items]              
Mortgage loan payable     $ 55,000,000        
Credit facility borrowing capacity $ 250,000,000            
Credit facility expiration date Sep. 08, 2021            
Remaining borrowing capacity     $ 177,200,000        
Unsecured credit facility [Member] | Term loan facility [Member]              
Line Of Credit Facility [Line Items]              
Credit facility borrowing capacity $ 50,000,000            
Credit facility expiration date Sep. 08, 2022            
Unsecured credit facility [Member] | Term Loan Maturing April 26, 2023 [Member]              
Line Of Credit Facility [Line Items]              
Mortgage maturity date     Apr. 26, 2016        
Basis spread on borrowings variable rate     1.65%        
Term loan amount             $ 100,000,000
Unsecured credit facility [Member] | Term Loan Maturing April 26, 2023 [Member] | Minimum [Member]              
Line Of Credit Facility [Line Items]              
Basis spread on borrowings variable rate     1.65%        
Unsecured credit facility [Member] | Term Loan Maturing April 26, 2023 [Member] | Maximum [Member]              
Line Of Credit Facility [Line Items]              
Basis spread on borrowings variable rate     2.25%        
Continuing Operations [Member]              
Line Of Credit Facility [Line Items]              
Payments of early extinguishment of debt costs     $ 100,000 2,600,000      
Mortgage loan payable     $ 582,994,000 $ 610,288,000