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Bank and Other Notes Payable: (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Mar. 31, 2007 Convertible Senior Notes ("Senior Notes") | Dec. 31, 2011 Convertible Senior Notes ("Senior Notes") call | Dec. 31, 2010 Convertible Senior Notes ("Senior Notes") | Dec. 31, 2009 Convertible Senior Notes ("Senior Notes") | Mar. 12, 2007 Convertible Senior Notes ("Senior Notes") | Dec. 31, 2011 Line of Credit Y | Apr. 25, 2011 Line of Credit | Dec. 31, 2011 Line of Credit Low end of range | Apr. 25, 2011 Line of Credit Low end of range | Dec. 31, 2011 Line of Credit High end of range | Apr. 25, 2011 Line of Credit High end of range | Dec. 31, 2011 Greeley Note | Dec. 31, 2010 Greeley Note | Dec. 31, 2011 Term Loans | Apr. 30, 2005 Term Loans | Dec. 31, 2011 Term Loans | Dec. 30, 2011 Term Loans | Dec. 31, 2011 Unsecured term loan | Dec. 08, 2011 Unsecured term loan Low end of range | Dec. 08, 2011 Unsecured term loan High end of range
Bank and other notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 950,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |  | $ 125,000,000 |  |
Interest rate on debt (as a percent) |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.42% |  |
Conversion rate per $1 principal amount |  |  |  |  | 8.9702 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt principal amount, basis for exchange |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  | $ 111.48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price, premium over market price (as a percent) |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, number of capped calls |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective conversion price (in dollars per share) |  |  |  |  | $ 130.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective conversion price, premium over market price (as a percent) |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing price of common stock (in dollars per share) |  |  |  |  |  |  |  | $ 92.90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase and retirement of debt |  |  |  |  | 180,314,000 | 18,468,000 | 89,065,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of convertible senior notes | 180,314,000 | 18,191,000 | 55,029,000 |  | 180,792,000 | 18,283,000 | 54,135,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(loss) gain on early extinguishment of debt | (10,588,000) | 3,661,000 | 29,161,000 |  | (1,449,000) | (489,000) | 29,824,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, carrying value |  |  |  |  | 437,788,000 | 606,971,000 |  |  |  |  |  |  |  |  | 24,848,000 | 25,624,000 |  |  |  |  |  |  |
Debt, unamortized discount |  |  |  |  | 1,530,000 | 12,661,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 7 |  |  |
Fair value of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,019,000 |  |
Effective interest rate (as a percent) |  |  |  |  | 5.41% | 5.41% |  |  |  |  |  |  |  |  | 6.34% |  |  |  |  |  |  |  |
Debt, fair value |  |  |  |  | 437,788,000 | 619,632,000 |  |  |  |  |  |  |  |  | 26,510,000 | 23,967,000 |  |  |  |  |  |  |
Revolving line of credit |  |  |  |  |  |  |  |  | 1,500,000,000 | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate for variable interest rate |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  | LIBOR | 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% |  |  |  | 1.50% |  |  | 2.20% | 1.95% | 3.20%
Line of credit, average interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.96% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings under the line of credit |  |  |  |  |  |  |  |  | 290,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum expanded revolving line of credit |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of outstanding line of credit |  |  |  |  |  |  |  |  | $ 292,366,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration