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Mortgages and Notes Payable (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
extensions
Mar. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 18, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                
Mortgages and notes payable $ 2,005,038,000     $ 2,005,038,000       $ 1,948,047,000
Unamortized debt issuance costs (8,784,000)     (8,784,000)       (6,302,000)
Gains on debt extinguishment $ 826,000   $ 0 826,000 $ 0      
Maximum liquidity requirements (in years) 1 year              
Revolving Credit Facility due 2018 [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity on revolving credit facility $ 475,000,000     475,000,000        
Maturity date on revolving credit facility Jan. 01, 2018              
Additional borrowing capacity on revolving credit facility $ 75,000,000     75,000,000        
Number of additional maturity extensions | extensions 2              
Term of optional extension 6 months              
Annual facility fee (in hundredths) 0.20%              
Amount outstanding on revolving credit facility $ 111,000,000     111,000,000        
Outstanding letters of credit on revolving credit facility 600,000     600,000        
Unused borrowing capacity on revolving credit facility 363,400,000     $ 363,400,000        
5.10%(4.22% effective rate) Mortgage Loan due 2017 [Member]                
Debt Instrument [Line Items]                
Early repayment of debt $ 108,200,000              
Effective interest rate (in hundredths) 4.22%     4.22%        
Scheduled maturity date Nov. 01, 2017              
Gains on debt extinguishment $ 400,000              
6.11% (5.36% effective rate) Mortgage Loan due 2017 (Note A) [Member]                
Debt Instrument [Line Items]                
Interest rate, basis spread (in hundredths)           5.36%    
Early repayment of debt 18,000,000.0              
Scheduled maturity date           Jul. 06, 2017    
Percentage of partner's interest in asset acquired (in hundredths)           77.20%    
Principal debt amount 18,000,000     $ 18,000,000        
6.11% (8.60% effective rate) Mortgage Loan due 2017 (Note B) [Member]                
Debt Instrument [Line Items]                
Interest rate, basis spread (in hundredths)           8.60%    
Early repayment of debt 500,000              
Scheduled maturity date           Jul. 06, 2017    
Gains on debt extinguishment $ 400,000              
Principal debt amount           $ 10,200,000    
Percentage of excess funds after waterfall payments (in hundredths)           50.00%    
Stated return on funds deposited in escrow (in hundredths)           10.00%    
Projected waterfall payment           $ 1,000,000    
4.0% Mortgage Loan due May 2029 [Member]                
Debt Instrument [Line Items]                
Effective interest rate (in hundredths) 4.00%     4.00%        
Scheduled maturity date May 01, 2029              
Principal debt amount $ 100,000,000     $ 100,000,000        
Debt issuance costs incurred $ 800,000     800,000        
3.875% (4.038% effective rate) Notes due 2027 [Member]                
Debt Instrument [Line Items]                
Effective interest rate (in hundredths)   4.038%            
Scheduled maturity date   Mar. 01, 2027            
Debt issuance costs incurred   $ 2,500,000            
Original issue discount   4,000,000            
5.85% (5.88% effective rate) Notes due 2017 [Member]                
Debt Instrument [Line Items]                
Principal debt amount   $ 379,700,000            
Interest rate (in hundredths)   5.85%            
Variable Rate Term Loan due 2022 [Member]                
Debt Instrument [Line Items]                
Principal debt amount   $ 150,000,000            
Variable Rate Term Loan (amended) due 2022 [Member]                
Debt Instrument [Line Items]                
Scheduled maturity date   Jan. 01, 2022            
Principal debt amount   $ 200,000,000            
Debt issuance costs incurred   $ 300,000            
Unsecured Notes due April 2018 [Member]                
Debt Instrument [Line Items]                
Scheduled maturity date Apr. 15, 2018              
Principal debt amount $ 200,000,000     200,000,000        
Secured indebtedness [Member]                
Debt Instrument [Line Items]                
Mortgages and notes payable 99,856,000     99,856,000       128,204,000
Aggregate undepreciated book value of secured real estate assets 147,800,000     147,800,000        
Unsecured indebtedness [Member]                
Debt Instrument [Line Items]                
Mortgages and notes payable $ 1,913,966,000     $ 1,913,966,000       $ 1,826,145,000
Subsequent Event [Member] | Revolving Credit Facility due 2018 [Member]                
Debt Instrument [Line Items]                
Amount outstanding on revolving credit facility             $ 97,000,000  
Outstanding letters of credit on revolving credit facility             600,000  
Unused borrowing capacity on revolving credit facility             $ 377,400,000  
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility due 2018 [Member]                
Debt Instrument [Line Items]                
Facility interest rate basis LIBOR plus 110 basis points              
Interest rate, basis spread (in hundredths) 1.10%              
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate Term Loan due 2018 [Member]                
Debt Instrument [Line Items]                
Interest rate, basis spread (in hundredths) 1.10%              
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate Term Loan (amended) due 2022 [Member]                
Debt Instrument [Line Items]                
Interest rate, basis spread (in hundredths)   1.10%            
Variable interest rate basis   LIBOR plus 110 basis points