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Convertible Notes (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Aug. 16, 2013 | Dec. 31, 2012
Interest expense related to notes |  |  |  |  |  |
Amortization of discount and debt issuance costs |  |  | $ 13,369 | $ 10,856 |  |
Interest expense | 8,552 | 7,121 | 23,290 | 20,420 |  |
Convertible Senior Notes [Member] |  |  |  |  |  |
Interest expense related to notes |  |  |  |  |  |
Interest expense | 7,485 | 5,945 | 20,032 | 17,325 |  |
Convertible Senior Notes [Member] | 5% Convertible Senior Notes due 2014 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Additional Effective Interest Rate | 11.70% |  | 11.70% |  |  | 11.70%
Interest expense related to notes |  |  |  |  |  |
Interest | 2,156 | 2,156 | 6,469 | 6,469 |  |
Amortization of discount and debt issuance costs | 4,416 | 3,789 | 12,650 | 10,856 |  |
Convertible notes stated interest rate (as a percent) | 5.00% |  | 5.00% |  |  | 5.00%
Convertible Senior Notes [Member] | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Additional Effective Interest Rate | 5.50% |  | 5.50% |  |  | 5.50%
Interest expense related to notes |  |  |  |  |  |
Interest | 194 | 0 | 194 | 0 |  |
Amortization of discount and debt issuance costs | $ 719 | $ 0 | $ 719 | $ 0 |  |
Convertible notes stated interest rate (as a percent) | 1.125% |  | 1.125% |  | 1.125% |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 The cost of borrowed funds accounted for as interest that was charged against earnings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 9 -Chapter V -Subsection II -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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