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Senior, Senior Subordinated, Convertible Senior Notes (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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Components of senior and senior subordinated notes |  |
Senior, senior subordinated, convertible senior notes | $ 798,215,000 | $ 722,797,000
Line of credit facility, amount outstanding | 0 |
7.731% senior subordinated notes due 2017 [Member] |  |
Components of senior and senior subordinated notes |  |
Senior, senior subordinated, convertible senior notes | 0 | 99,825,000
4.50% senior notes due two thousand eighteen [Member] |  |
Components of senior and senior subordinated notes |  |
Senior, senior subordinated, convertible senior notes | 175,000,000 | 0
7.15% senior notes due 2020 [Member] |  |
Components of senior and senior subordinated notes |  |
Senior, senior subordinated, convertible senior notes | 196,715,000 | 196,472,000
7.00% senior notes due 2022 [Member] |  |
Components of senior and senior subordinated notes |  |
Senior, senior subordinated, convertible senior notes | 300,000,000 | 300,000,000
1.875% convertible senior notes due 2032 [Member] |  |
Components of senior and senior subordinated notes |  |
Senior, senior subordinated, convertible senior notes | 126,500,000 | 126,500,000
Revolving Credit Facility [Member] |  |
Components of senior and senior subordinated notes |  |
Line of credit facility, amount outstanding | $ 0 | $ 0

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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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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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