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Mortgages and Notes Payable (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
extension
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 25, 2019
USD ($)
Debt Instrument [Line Items]          
Mortgages and notes payable, net $ 2,085,831,000 $ 2,014,333,000      
Less-unamortized debt issuance costs (9,164,000) (8,161,000)      
Scheduled future principal payments [Abstract]          
2019 367,000        
2020 225,444,000        
2021 300,757,000        
2022 583,038,000        
2023 251,376,000        
Thereafter 734,013,000        
Less-unamortized debt issuance costs (9,164,000) (8,161,000)      
Mortgages and notes payable, net 2,085,831,000 2,014,333,000      
Annual repayments through principal amortization 1,800,000        
Gains/(losses) on debt extinguishment $ 0 (26,000) $ 0    
Lender covenant compliance to accelerate outstanding borrowings 51.00%        
Cross-default minimum threshold $ 30,000,000        
Holders covenant compliance of bonds 25.00%        
Uncured covenant compliance default period 60 days        
Capitalized Interest [Abstract]          
Capitalized Interest $ 6,700,000 8,800,000 8,200,000    
4.0% Mortgage Loan Due 2029 [Member]          
Scheduled future principal payments [Abstract]          
Principal amount of debt   $ 100,000,000      
Scheduled maturity date   May 01, 2029      
Current interest rate (in hundredths)   4.00%      
Debt issuance costs   $ 800,000      
5.85% (5.88% effective rate) Notes due 2017 [Member]          
Scheduled future principal payments [Abstract]          
Principal amount of debt   $ 379,700,000.0      
Current interest rate (in hundredths)   5.85%      
7.50% Notes due 2018 [Member]          
Scheduled future principal payments [Abstract]          
Principal amount of debt $ 200,000,000        
Current interest rate (in hundredths) 7.50%        
3.875% (4.038% effective rate) Notes due 2027 [Member]          
Scheduled future principal payments [Abstract]          
Principal amount of debt   $ 300,000,000      
Scheduled maturity date   Mar. 01, 2027      
Current interest rate (in hundredths)   4.038%      
Original issuance discount   $ 4,000,000      
Stated interest rate (in hundredths)   3.875%      
Debt issuance costs   $ 2,500,000      
4.125% (4.271% effective rate) Notes due 2028 [Member]          
Scheduled future principal payments [Abstract]          
Principal amount of debt $ 350,000,000        
Scheduled maturity date Mar. 15, 2028        
Current interest rate (in hundredths) 4.271%        
Original issuance discount $ 4,100,000        
Stated interest rate (in hundredths) 4.125%        
Debt issuance costs $ 2,900,000        
Variable Rate Term Loan due 2020 [Member]          
Scheduled future principal payments [Abstract]          
Early repayment of debt   125,000,000      
Principal amount of debt       $ 350,000,000  
Scheduled maturity date       Jun. 01, 2020  
Interest rate, basis spread       1.10%  
Debt issuance costs       $ 1,300,000  
Gains/(losses) on debt extinguishment   (400,000)      
Variable Rate Term Loan due 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Scheduled future principal payments [Abstract]          
Interest rate basis       LIBOR plus 110 basis points  
Variable Rate Term Loan due 2022 [Member]          
Scheduled future principal payments [Abstract]          
Principal amount of debt   200,000,000 $ 150,000,000    
Scheduled maturity date     Jan. 01, 2022    
Interest rate, basis spread     1.10%    
Debt issuance costs   300,000      
Variable Rate Term Loan due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Scheduled future principal payments [Abstract]          
Interest rate basis     LIBOR plus 110 basis points    
Variable Rate Term Loan (2) due 2022 [Member]          
Scheduled future principal payments [Abstract]          
Principal amount of debt   $ 200,000,000      
Term of debt instrument (in years)   5 years      
Scheduled maturity date   Nov. 01, 2022      
Interest rate basis   LIBOR plus 110 basis points      
Interest rate, basis spread   1.10%      
Debt issuance costs   $ 1,100,000      
Gains/(losses) on debt extinguishment   $ (400,000)      
Variable Rate Term Loan (1) due 2019 [Member]          
Scheduled future principal payments [Abstract]          
Scheduled maturity date   Jan. 01, 2019      
Interest rate basis   LIBOR plus 120 basis points      
Interest rate, basis spread   1.20%      
Revolving Credit Facility due 2022 [Member]          
Scheduled future principal payments [Abstract]          
Maximum borrowing capacity on revolving credit facility   $ 600,000,000 $ 475,000,000    
Maturity date on revolving credit facility   Jan. 01, 2022      
Additional borrowing capacity on revolving credit facility   $ 400,000,000      
Number of additional maturity extensions | extension   2      
Term of optional extensions   6 months      
Annual facility fee (in hundredths)   0.20%      
Amount outstanding on revolving credit facility 182,000,000        
Outstanding letters of credit on revolving credit facility 200,000        
Unused borrowing capacity on revolving credit facility 417,800,000        
Interest rate, basis spread   1.00%      
Debt issuance costs   $ 3,500,000      
Gains/(losses) on debt extinguishment   $ (100,000)      
Revolving Credit Facility due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Scheduled future principal payments [Abstract]          
Interest rate   LIBOR plus 100 basis points      
Variable Rate Term Loan (2) due 2019 [Member]          
Scheduled future principal payments [Abstract]          
Principal amount of debt       $ 225,000,000  
Term of debt instrument (in years)       7 years  
Scheduled maturity date       Jan. 01, 2019  
Interest rate, basis spread       1.75%  
Variable Rate Term Loan (2) due 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Scheduled future principal payments [Abstract]          
Interest rate basis       LIBOR plus 175 basis points  
5.10%(4.22% effective rate) Mortgage Loan due 2017 [Member]          
Scheduled future principal payments [Abstract]          
Early repayment of debt   $ 108,200,000      
Current interest rate (in hundredths)   4.22%      
Gains/(losses) on debt extinguishment   $ 400,000      
6.11% (5.36% effective rate) Mortgage Loan due 2017 (Note A) [Member]          
Scheduled future principal payments [Abstract]          
Early repayment of debt   18,000,000      
Principal amount of debt       $ 18,000,000  
Scheduled maturity date       Jul. 06, 2017  
Current interest rate (in hundredths)       5.36%  
Percentage of partner's interest in asset acquired (in hundredths)       77.20%  
6.11% (8.60% effective rate) Mortgage Loan due 2017 (Note B) [Member]          
Scheduled future principal payments [Abstract]          
Early repayment of debt   500,000      
Principal amount of debt       $ 10,200,000.0  
Scheduled maturity date       Jul. 06, 2017  
Current interest rate (in hundredths)       8.60%  
Gains/(losses) on debt extinguishment   400,000      
7.50% Mortgage Loan due 2016 [Member]          
Scheduled future principal payments [Abstract]          
Early repayment of debt     $ 43,600,000    
Scheduled maturity date     Aug. 01, 2016    
Current interest rate (in hundredths)     7.50%    
Bridge Credit Facility due 2016 [Member]          
Scheduled future principal payments [Abstract]          
Maximum borrowing capacity on revolving credit facility       $ 350,000,000  
Amount outstanding on revolving credit facility        
Term of debt instrument (in years)       6 months  
Interest rate, basis spread       1.10%  
Bridge Credit Facility due 2016 [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Scheduled future principal payments [Abstract]          
Interest rate       LIBOR plus 110 basis points  
Secured indebtedness [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 97,179,000 98,981,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 97,179,000 98,981,000      
Aggregate undepreciated book value of secured real estate assets 147,600,000        
Secured indebtedness [Member] | 4.0% Mortgage Loan Due 2029 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 97,179,000 98,981,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 97,179,000 98,981,000      
Unsecured indebtedness [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 1,997,816,000 1,923,513,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 1,997,816,000 1,923,513,000      
Unsecured indebtedness [Member] | 7.50% Notes due 2018 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 0 200,000,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 0 200,000,000      
Unsecured indebtedness [Member] | 3.20% (3.363% effective rate) Notes due 2021 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 298,936,000 298,504,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 298,936,000 298,504,000      
Unamortized discount 1,100,000 1,500,000      
Unsecured indebtedness [Member] | 3.625% (3.752% effective rate) Notes due 2023 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 248,938,000 248,675,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 248,938,000 248,675,000      
Unamortized discount 1,100,000 1,300,000      
Unsecured indebtedness [Member] | 3.875% (4.038% effective rate) Notes due 2027 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 296,734,000 296,334,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 296,734,000 296,334,000      
Unamortized discount 3,300,000 3,700,000      
Unsecured indebtedness [Member] | 4.125% (4.271% effective rate) Notes due 2028 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 346,208,000 0      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 346,208,000 0      
Unamortized discount 3,800,000        
Unsecured indebtedness [Member] | Variable Rate Term Loan (4) due 2018 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 0 10,000,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net 0 10,000,000      
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2020 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net 225,000,000 225,000,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net $ 225,000,000 225,000,000      
Interest rate under derivative instruments (in hundredths) 2.78%        
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2022 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net $ 200,000,000 200,000,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net $ 200,000,000 200,000,000      
Interest rate under derivative instruments (in hundredths) 2.79%        
Current interest rate (in hundredths) 3.45%        
Unsecured indebtedness [Member] | Variable Rate Term Loan (2) due 2022 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net $ 200,000,000        
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net $ 200,000,000        
Current interest rate (in hundredths) 3.61%        
Unsecured indebtedness [Member] | Variable Rate Term Loan (1) due 2019 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net   200,000,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net   200,000,000      
Unsecured indebtedness [Member] | Revolving Credit Facility due 2022 [Member]          
Debt Instrument [Line Items]          
Mortgages and notes payable, net $ 182,000,000 245,000,000      
Scheduled future principal payments [Abstract]          
Mortgages and notes payable, net $ 182,000,000 $ 245,000,000      
Current interest rate (in hundredths) 3.46%        
Subsequent Event [Member] | Revolving Credit Facility due 2022 [Member]          
Scheduled future principal payments [Abstract]          
Amount outstanding on revolving credit facility         $ 191,000,000
Outstanding letters of credit on revolving credit facility         200,000
Unused borrowing capacity on revolving credit facility         $ 408,800,000