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Bank and Other Notes Payable: (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |  | 1 Months Ended | 6 Months Ended |  |  |
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Mar. 31, 2007 Convertible Senior Notes ("Senior Notes") | Mar. 31, 2012 Convertible Senior Notes ("Senior Notes") | Jun. 30, 2012 Convertible Senior Notes ("Senior Notes") | Dec. 31, 2011 Convertible Senior Notes ("Senior Notes") | Jun. 30, 2012 Line of Credit year | Dec. 31, 2011 Line of Credit | Apr. 25, 2011 Line of Credit | Jun. 30, 2012 Line of Credit Low end of range | Apr. 25, 2011 Line of Credit Low end of range | Jun. 30, 2012 Line of Credit High end of range | Apr. 25, 2011 Line of Credit High end of range | Dec. 31, 2011 Unsecured term loan year | Jun. 30, 2012 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, 2012 Greeley Note | Dec. 31, 2011 Greeley Note
Bank and other notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued | $ 950,000 |  |  |  |  |  |  |  |  |  |  | $ 125,000 |  |  |  |  |
Interest rate on debt (as a percent) |  |  | 3.25% |  |  |  |  |  |  |  |  | 2.42% | 2.59% |  |  |  |
Conversion rate per $1 principal amount |  | 8.9702 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt principal amount, basis for exchange |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Senior Notes |  | 439,318 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, carrying value |  |  |  | 437,788 |  |  |  |  |  |  |  |  |  |  |  | 24,444 | 24,848
Debt, unamortized discount |  |  |  | 1,530 |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt (in years) |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |
Fair value of debt |  |  |  |  |  |  |  |  |  |  |  | 120,019 | 122,589 |  |  |  |
Effective interest rate (as a percent) |  |  |  | 5.41% |  |  |  |  |  |  |  |  |  |  |  | 6.34% |
Debt, fair value |  |  |  | 439,318 |  |  |  |  |  |  |  |  |  |  |  | 25,594 | 26,510
Revolving line of credit |  |  |  |  | 1,500,000 |  | 1,500,000 |  |  |  |  |  |  |  |  |  |
Reference rate for variable interest rate |  |  |  |  | LIBOR |  |  |  |  |  |  |  | LIBOR |  |  |  |
Term of extension (in years) |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  |  | 2.00% |  |  | 1.75% | 0.75% | 3.00% | 1.10% |  | 2.20% | 1.95% | 3.20% |  |
Line of credit, average interest rate (as a percent) |  |  |  |  | 2.78% | 2.96% |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings under the line of credit |  |  |  |  | 615 | 290,000 |  |  |  |  |  |  |  |  |  |  |
Maximum expanded revolving line of credit |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of outstanding line of credit |  |  |  |  | $ 616,566 | $ 292,366 |  |  |  |  |  |  |  |  |  |  |

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