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Convertible debt (Tables) | 12 Months Ended
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Dec. 31, 2014
Debt Instrument [Line Items] |
Convertible Debt [Table Text Block] | The Senior Notes consist of the following (in thousands):
|  | As of December 31, 2014
Liability component: |  |
Principal |  | $ | 143,750 |
Less: debt discount, net of amortization |  | (33,302 | )
Net carrying amount |  | $ | 110,448 |
Equity component (1) |  | $ | 28,714 |
(1) Recorded in the consolidated balance sheet within additional paid-in capital, net of $1.2 million issuance cost in equity. The following table sets forth total interest expense recognized related to the Senior Notes (in thousands):
|  | Year Ended December 31, 2014
2.0% coupon |  | $ | 162 |
Amortization of debt issuance costs |  | 46 |
Amortization of debt discount |  | 283 |
Total |  | $ | 491 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Details
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