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Bank and Other Notes Payable: (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 0 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 15, 2012 Senior Notes | Mar. 16, 2007 Senior Notes | Dec. 31, 2012 Senior Notes | Dec. 31, 2013 Line of Credit | Dec. 31, 2012 Line of Credit | Aug. 06, 2013 Line of Credit Low end of range | Dec. 31, 2013 Line of Credit Low end of range | Aug. 06, 2013 Line of Credit High end of range | Dec. 31, 2013 Line of Credit High end of range | Dec. 08, 2011 Unsecured term loan | Dec. 31, 2013 Unsecured term loan | Dec. 31, 2012 Unsecured term loan | Dec. 08, 2011 Unsecured term loan Low end of range | Dec. 08, 2011 Unsecured term loan High end of range | Dec. 31, 2012 Greeley Note | Mar. 29, 2013 Prasada Note | Dec. 31, 2013 Prasada Note
Bank and other notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 950,000,000 |  |  |  |  |  |  |  | $ 125,000,000 | $ 125,000,000 |  |  |  |  | $ 13,330,000 |
Interest rate on debt (as a percent) |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |
Repayment of Senior Notes |  |  |  | 439,318,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase and retirement of debt |  |  |  |  |  | 180,314,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of convertible senior notes | 0 | 0 | 180,314,000 |  |  | 180,792,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on early extinguishment of debt, net | 1,432,000 | 0 | (1,485,000) |  |  | (1,449,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit |  |  |  |  |  |  | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  |  |  |  | 1.50% |  | 1.375% | 1.75% | 2.00% | 3.00% |  | 2.20% |  | 1.95% | 3.20% |  |  |
Term of extension |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum expanded revolving line of credit |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate for variable interest rate |  |  |  |  |  |  | LIBOR |  |  |  |  |  | LIBOR | LIBOR |  |  |  |  |  |
Borrowings under line of credit |  |  |  |  |  |  | 30,000,000 | 675,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate (as a percent) |  |  |  |  |  |  | 1.85% | 2.76% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.51% | 2.57% |  |  |  |  |
Fair value of line of credit |  |  |  |  |  |  | 28,214,000 | 675,107,000 |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of term loan |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,802,000 | 121,821,000 |  |  |  |  | 13,114,000
Carrying value of term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,027,000 |  | $ 12,537,000

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