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Bank and Other Notes Payable (Details)
3 Months Ended 12 Months Ended
Mar. 29, 2013
USD ($)
Mar. 31, 2020
USD ($)
derivative
Dec. 31, 2019
USD ($)
Mortgage loans payable on real estate      
Unamortized deferred finance costs   $ 15,053,000 $ 16,042,000
Availability for additional borrowing   $ 19,719,000 679,719,000
Swaps      
Mortgage loans payable on real estate      
Number of agreements | derivative   4  
Swaps | Level 2 measurement      
Mortgage loans payable on real estate      
Outstanding borrowings under the line of credit   $ 400,000,000  
Line of Credit      
Mortgage loans payable on real estate      
Outstanding borrowings under the line of credit   1,480,000,000 820,000,000
Unamortized deferred finance costs   $ 1,994,000 $ 2,623,000
Line of credit, average interest rate   3.11% 3.92%
Line of Credit | Level 2 measurement      
Mortgage loans payable on real estate      
Fair value of outstanding line of credit   $ 1,503,246,000 $ 826,280,000
Prasada Note      
Mortgage loans payable on real estate      
Amount of additional borrowing $ 13,330,000    
Interest rate on debt 5.25%    
LIBOR | Line of Credit      
Mortgage loans payable on real estate      
Interest rate spread over basis   1.55%  
Revolving line of credit      
Mortgage loans payable on real estate      
Maximum contingent borrowing capacity   $ 2,000,000,000  
Revolving line of credit | Line of Credit | Swaps      
Mortgage loans payable on real estate      
Effective interest rate   4.30%  
Revolving line of credit | LIBOR | Low end of range      
Mortgage loans payable on real estate      
Interest rate spread over basis   1.30%  
Revolving line of credit | LIBOR | High end of range      
Mortgage loans payable on real estate      
Interest rate spread over basis   1.90%