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Bank and Other Notes Payable: (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 29, 2013
Mar. 31, 2016
Dec. 31, 2015
Mortgage loans payable on real estate      
Unamortized deferred finance costs   $ 13,182,000 $ 16,025,000
Line of Credit      
Mortgage loans payable on real estate      
Revolving line of credit   $ 1,500,000,000  
Interest rate basis   LIBOR  
Outstanding borrowings under the line of credit   $ 745,000,000 650,000,000
Unamortized deferred finance costs   $ 6,299,000 $ 6,967,000
Line of credit, average interest rate (as a percent)   2.11% 1.95%
Fair value of outstanding line of credit   $ 739,417,000 $ 640,260,000
Prasada Note      
Mortgage loans payable on real estate      
Amount of additional borrowing $ 13,330,000    
Interest rate on debt (as a percent) 5.25%    
Debt, carrying value   8,218,000 9,130,000
Debt, fair value   $ 8,244,000 $ 9,168,000
London Interbank Offered Rate (LIBOR) | Line of Credit      
Mortgage loans payable on real estate      
Interest rate spread over basis (as a percent)   1.50%  
London Interbank Offered Rate (LIBOR) | Line of Credit | Low end of range      
Mortgage loans payable on real estate      
Interest rate spread over basis (as a percent)   1.38%  
London Interbank Offered Rate (LIBOR) | Line of Credit | High end of range      
Mortgage loans payable on real estate      
Interest rate spread over basis (as a percent)   2.00%