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Convertible Notes (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Interest expense related to notes |  |  |  |  |
Amortization of discount and debt issuance costs |  |  | $ 11,711 | $ 8,234 |
Interest expense | 8,770 | 7,426 | 18,696 | 14,738 |
Convertible Senior Notes |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Interest expense | 7,630 | 6,301 | 16,416 | 12,547 |
Convertible Senior Notes | 5% Convertible Senior Notes due 2014 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Interest | 1,773 | 2,156 | 3,929 | 4,313 |
Amortization of discount and debt issuance costs | 3,975 | 4,145 | 8,744 | 8,234 |
Convertible notes stated interest rate (as a percent) | 5.00% | 5.00% | 5.00% | 5.00% | 5.00%
Additional Effective Interest Rate | 11.70% | 11.70% | 11.70% | 11.70% |
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Interest | 388 | 0 | 776 | 0 |
Amortization of discount and debt issuance costs | $ 1,494 | $ 0 | $ 2,967 | $ 0 |
Convertible notes stated interest rate (as a percent) | 1.125% | 1.125% | 1.125% | 1.125% | 1.125%
Additional Effective Interest Rate | 5.50% | 5.50% | 5.50% | 5.50% |

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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=31042434&loc=d3e3602-108585 + Details
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- Definition Contractual interest rate for funds borrowed, under the 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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