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Senior, Convertible Senior Notes (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Components of senior and senior subordinated notes |  |
Senior, convertible senior notes and other borrowings | $ 904,913,000 | $ 905,055,000
Line of credit facility, amount outstanding | 0 | 0
4.50% senior notes due 2018 |  |
Components of senior and senior subordinated notes |  |
Senior, convertible senior notes and other borrowings | 175,000,000 | 175,000,000
7.15% senior notes due 2020. At March 31, 2014 and December 31, 2013 there was approximately $3,413 and $3,555 in net unamortized premium, respectively |  |
Components of senior and senior subordinated notes |  |
Senior, convertible senior notes and other borrowings | 303,413,000 | 303,555,000
7.00% senior notes due 2022 |  |
Components of senior and senior subordinated notes |  |
Senior, convertible senior notes and other borrowings | 300,000,000 | 300,000,000
1.875% convertible senior notes due 2032 |  |
Components of senior and senior subordinated notes |  |
Senior, convertible senior notes and other borrowings | 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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