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Financing Arrangements (Tables) | 9 Months Ended
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Sep. 30, 2017
Debt Instrument [Line Items] |
Schedule of Convertible Debt Interest Expense [Table Text Block] | During the three and nine months ended September 30, 2017 and 2016, the Company recognized interest cost on the Notes as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Contractual interest cost based on 3.25% of the principal amount per annum | $ | 2,032 |  |  | $ | 2,032 |  |  | $ | 6,096 |  |  | $ | 4,063 |
Amortization of debt discount | 2,722 |  |  | 2,458 |  |  | 7,964 |  |  | 4,854 |
Total interest cost | $ | 4,754 |  |  | $ | 4,490 |  |  | $ | 14,060 |  |  | $ | 8,917 |
Convertible Debt [Table Text Block] | The carrying amount of the Notes consisted of the following (in thousands):
| September 30, 2017 |  | December 31, 2016
Liability component: |  |  |
Principal amount | $ | 250,000 |  |  | $ | 250,000 |
Less: debt discount | (63,041 | ) |  | (71,005 | )
Net carrying amount of liability component | $ | 186,959 |  |  | $ | 178,995 |
Net carrying amount of equity component | $ | 67,014 |  |  | $ | 67,014 |

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- Definition Schedule of Convertible Debt Interest Expense [Table Text Block] + References No definition available. + Details
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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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