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Bank and Other Notes Payable: (Details) (USD $)
 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2014
Line of Credit
Dec. 31, 2013
Line of Credit
Aug. 06, 2013
Line of Credit
Low end of range
Sep. 30, 2014
Line of Credit
Low end of range
Aug. 06, 2013
Line of Credit
High end of range
Sep. 30, 2014
Line of Credit
High end of range
Dec. 08, 2011
Unsecured term loan
Sep. 30, 2014
Unsecured term loan
Dec. 31, 2013
Unsecured term loan
Dec. 08, 2011
Unsecured term loan
Low end of range
Dec. 08, 2011
Unsecured term loan
High end of range
Sep. 30, 2014
Convertible Notes Payable
Mar. 29, 2013
Prasada Note
Sep. 30, 2014
Prasada Note
Dec. 31, 2013
Prasada Note
Mortgage loans payable on real estate                              
Revolving line of credit $ 1,500,000,000                            
Interest rate spread over basis (as a percent) 1.38%   1.375% 1.75% 2.00% 3.00%   1.95%   1.95% 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    
Outstanding borrowings under the line of credit 410,000,000 30,000,000                          
Line of credit, average interest rate (as a percent) 1.81% 1.85%                          
Fair value of outstanding line of credit 387,244,000 28,214,000                          
Interest rate basis LIBOR   LIBOR LIBOR     LIBOR LIBOR              
Interest rate (as a percent)               2.25% 2.51%            
Interest rate on debt (as a percent)                         5.25%    
Debt, carrying value                           11,301,000 12,537,000
Debt, fair value               $ 119,636,000 $ 120,802,000         $ 11,699,000 $ 13,114,000