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Bank and Other Notes Payable: (Details) (USD $) | 6 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended |  | 0 Months Ended | 6 Months Ended | 0 Months Ended |  |
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Jun. 30, 2014 Line of Credit | Dec. 31, 2013 Line of Credit | Aug. 06, 2013 Line of Credit Low end of range | Jun. 30, 2014 Line of Credit Low end of range | Aug. 06, 2013 Line of Credit High end of range | Jun. 30, 2014 Line of Credit High end of range | Dec. 08, 2011 Unsecured term loan | Jun. 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 | Jun. 30, 2014 Convertible Notes Payable | Mar. 29, 2013 Prasada Note | Jun. 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) | 1.40% |  | 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 | 250,000,000 | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, average interest rate (as a percent) | 2.17% | 1.85% |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of outstanding line of credit | 239,362,000 | 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, fair value |  |  |  |  |  |  |  | 119,688,000 | 120,802,000 |  |  |  |  | 12,189,000 | 13,114,000
Debt, carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,718,000 | $ 12,537,000

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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