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Convertible Notes (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Interest expense related to notes |  |  |
Total interest expense on convertible notes | $ 27,510 | $ 24,828 | $ 20,228
Adjustment to interest expense due to incorrect amortization of the non-cash debt discount |  |  | 700
Zero Coupon Convertible Senior Notes due 2010 |  |  |
Interest expense related to notes |  |  |
Amortization of discount at an additional effective interest rate | 0 | 0 | 958
Effective interest rate (as a percent) |  |  | 8.40%
Convertible notes |  |  |
Interest expense related to notes |  |  |
Total interest expense on convertible notes | 23,320 | 21,247 | 19,699
5% Convertible Senior Notes due 2014 |  |  |
Interest expense related to notes |  |  |
2014 Notes coupon interest at a rate of 5% | 8,625 | 8,625 | 8,625
Amortization of discount at an additional effective interest rate | $ 14,695 | $ 12,622 | $ 10,116
Effective interest rate (as a percent) | 11.70% | 11.70% | 11.70%

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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