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Convertible Notes (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Interest expense related to notes |  |  |  |  |
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7% |  |  | $ 8,234 | $ 7,067 |
Interest expense | 7,426 | 6,719 | 14,738 | 13,299 |
5% Convertible Senior Notes due 2014 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
2014 Notes coupon interest at a rate of 5% | 2,156 | 2,156 | 4,313 | 4,313 |
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7% | 4,145 | 3,557 | 8,234 | 7,067 |
Interest expense | $ 6,301 | $ 5,713 | $ 12,547 | $ 11,380 |
Convertible notes stated interest rate (as a percent) | 5.00% | 5.00% | 5.00% | 5.00% | 5.00%
Effective interest rate (as a percent) | 11.70% | 11.70% | 11.70% | 11.70% |

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- Definition Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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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