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Bank and Other Notes Payable: (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2014
Convertible Notes Payable
Mar. 31, 2014
Line of Credit
Dec. 31, 2013
Line of Credit
Dec. 08, 2011
Unsecured term loan
Mar. 31, 2014
Unsecured term loan
Dec. 31, 2013
Unsecured term loan
Mar. 29, 2013
Prasada Note
Mar. 31, 2014
Prasada Note
Dec. 31, 2013
Prasada Note
Aug. 06, 2013
Low end of range
Line of Credit
Mar. 31, 2014
Low end of range
Line of Credit
Dec. 08, 2011
Low end of range
Unsecured term loan
Aug. 06, 2013
High end of range
Line of Credit
Mar. 31, 2014
High end of range
Line of Credit
Dec. 08, 2011
High end of range
Unsecured term loan
Mortgage loans payable on real estate                              
Revolving line of credit   $ 1,500,000,000                          
Interest rate spread over basis (as a percent)   1.375%     1.95%         1.375% 1.75% 1.95% 2.00% 3.00% 3.20%
Term of extension (in years) 1 year                            
Expansion borrowing capacity   2,000,000,000                          
Amount of additional borrowing       125,000,000 125,000,000   13,330,000                
Interest rate on debt (as a percent)             5.25%                
Interest rate basis       LIBOR LIBOR                    
Outstanding borrowings under the line of credit   90,000,000 30,000,000                        
Line of credit, average interest rate (as a percent)   1.83% 1.85%                        
Fair value of outstanding line of credit   84,718,000 28,214,000                        
Interest rate (as a percent)         2.50% 2.51%                  
Debt, carrying value               12,132,000 12,537,000            
Debt, fair value         $ 120,760,000 $ 120,802,000   $ 12,613,000 $ 13,114,000