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Fair Value of Assets and Liabilities (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Senior Notes, due 2012 at 6.85% | Apr. 11, 2012 Senior Notes, due 2012 at 6.85% | Dec. 31, 2011 Senior Notes, due 2012 at 6.85% | Dec. 31, 2012 Senior Notes, due 2013 at 6.75% | Sep. 10, 2012 Senior Notes, due 2013 at 6.75% | Dec. 31, 2011 Senior Notes, due 2013 at 6.75% | Dec. 31, 2012 Senior Notes, due 2014 at 7.875% | Dec. 31, 2011 Senior Notes, due 2014 at 7.875% | Dec. 31, 2012 Senior Notes, due 2015 at 5.125% | Dec. 31, 2011 Senior Notes, due 2015 at 5.125% | Dec. 31, 2012 Senior Notes, due 2016 at 6.3% | Dec. 31, 2011 Senior Notes, due 2016 at 6.3% | Dec. 31, 2012 Senior Notes, due 2017 at 5.625% | Dec. 31, 2011 Senior Notes, due 2017 at 5.625% | Dec. 31, 2012 Senior Notes, due 2018 at 6.7% | Dec. 31, 2011 Senior Notes, due 2018 at 6.7% | Dec. 31, 2012 Senior Notes, due 2022 at 5% | Aug. 16, 2012 Senior Notes, due 2022 at 5% | Dec. 31, 2012 Convertible senior notes, due 2027 at 3.8% | Mar. 20, 2012 Convertible senior notes, due 2027 at 3.8% | Dec. 31, 2011 Convertible senior notes, due 2027 at 3.8% | Dec. 31, 2012 Carrying Amount | Dec. 31, 2011 Carrying Amount | Dec. 31, 2011 Carrying Amount Senior Notes, due 2012 at 6.85% | Dec. 31, 2011 Carrying Amount Senior Notes, due 2013 at 6.75% | Dec. 31, 2012 Carrying Amount Senior Notes, due 2014 at 7.875% | Dec. 31, 2011 Carrying Amount Senior Notes, due 2014 at 7.875% | Dec. 31, 2012 Carrying Amount Senior Notes, due 2015 at 5.125% | Dec. 31, 2011 Carrying Amount Senior Notes, due 2015 at 5.125% | Dec. 31, 2012 Carrying Amount Senior Notes, due 2016 at 6.3% | Dec. 31, 2011 Carrying Amount Senior Notes, due 2016 at 6.3% | Dec. 31, 2012 Carrying Amount Senior Notes, due 2017 at 5.625% | Dec. 31, 2011 Carrying Amount Senior Notes, due 2017 at 5.625% | Dec. 31, 2012 Carrying Amount Senior Notes, due 2018 at 6.7% | Dec. 31, 2011 Carrying Amount Senior Notes, due 2018 at 6.7% | Dec. 31, 2012 Carrying Amount Senior Notes, due 2022 at 5% | Dec. 31, 2012 Carrying Amount Convertible senior notes, due 2027 at 3.8% | Dec. 31, 2011 Carrying Amount Convertible senior notes, due 2027 at 3.8% | Dec. 31, 2012 Fair Value | Dec. 31, 2011 Fair Value | Dec. 31, 2011 Fair Value Senior Notes, due 2012 at 6.85% | Dec. 31, 2011 Fair Value Senior Notes, due 2013 at 6.75% | Dec. 31, 2012 Fair Value Senior Notes, due 2014 at 7.875% | Dec. 31, 2011 Fair Value Senior Notes, due 2014 at 7.875% | Dec. 31, 2012 Fair Value Senior Notes, due 2015 at 5.125% | Dec. 31, 2011 Fair Value Senior Notes, due 2015 at 5.125% | Dec. 31, 2012 Fair Value Senior Notes, due 2016 at 6.3% | Dec. 31, 2011 Fair Value Senior Notes, due 2016 at 6.3% | Dec. 31, 2012 Fair Value Senior Notes, due 2017 at 5.625% | Dec. 31, 2011 Fair Value Senior Notes, due 2017 at 5.625% | Dec. 31, 2012 Fair Value Senior Notes, due 2018 at 6.7% | Dec. 31, 2011 Fair Value Senior Notes, due 2018 at 6.7% | Dec. 31, 2012 Fair Value Senior Notes, due 2022 at 5% | Dec. 31, 2012 Fair Value Convertible senior notes, due 2027 at 3.8% | Dec. 31, 2011 Fair Value Convertible senior notes, due 2027 at 3.8%
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Fair Value of Assets and Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities | $ 2,733,478 |  |  |  | $ 100,829 |  |  | $ 287,000 | $ 300,000 | $ 300,000 | $ 280,000 | $ 280,000 | $ 275,000 | $ 275,000 | $ 300,000 | $ 300,000 | $ 350,000 | $ 350,000 | $ 500,000 |  | $ 8,478 |  | $ 79,054 |  |  | $ 100,829 | $ 287,000 | $ 300,000 | $ 300,000 | $ 280,000 | $ 280,000 | $ 275,000 | $ 275,000 | $ 300,000 | $ 300,000 | $ 350,000 | $ 350,000 | $ 500,000 | $ 8,478 | $ 79,054 |  |  | $ 105,407 | $ 301,871 | $ 333,360 | $ 333,887 | $ 298,926 | $ 290,052 | $ 306,078 | $ 291,572 | $ 335,173 | $ 313,106 | $ 417,293 | $ 386,942 | $ 531,343 | $ 9,092 | $ 80,087
Unamortized discounts | (11,120) | (5,169) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 231 | (11,120) | (5,169) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,002,358 | $ 1,966,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,231,265 | $ 2,102,924 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate stated percentage |  |  | 6.85% | 6.85% | 6.85% | 6.75% | 6.75% | 6.75% | 7.875% | 7.875% | 5.125% | 5.125% | 6.30% | 6.30% | 5.625% | 5.625% | 6.70% | 6.70% | 5.00% | 5.00% | 3.80% | 3.80% | 3.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond 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 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -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 -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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