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Convertible Notes (Tables) | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
ReclassifiedUnamortizedDebtIssuanceCostsReportedInBalanceSheetTableTextBlock [Table Text Block] | The Company adopted ASU 2015-03 during the first quarter of 2016. Pursuant to the guidance in ASU 2015-03, the Company has reclassified unamortized debt issuance costs associated with the Company's 2018 Notes in the previously reported Consolidated Balance Sheet as of December 31, 2015, as follows:
(In thousands) |  | As presented December 31, 2015 |  | Reclassifications |  | As adjusted December 31, 2015
Other assets |  | $ | 3,648 |  |  | $ | (1,483 | ) |  | $ | 2,165 |
Convertible notes, long-term |  | $ | 120,901 |  |  | $ | (1,483 | ) |  | $ | 119,418 |
Schedule of convertible notes | The Company’s convertible notes are shown in the following table.
(Dollars in thousands) | As of December 31, 2016 |  | As of December 31, 2015
1.125% Convertible Senior Notes due 2018 | $ | 138,000 |  |  | $ | 138,000 |
Unamortized discount | (10,913 | ) |  | (17,099 | )
Unamortized debt issuance costs | (920 | ) |  | (1,483 | )
Total convertible notes | $ | 126,167 |  |  | $ | 119,418 |
Less current portion | — |  |  | — |
Total long-term convertible notes | $ | 126,167 |  |  | $ | 119,418 |
Schedule of interest expense on notes | Interest expense related to the notes for the years ended December 31, 2016, 2015 and 2014 was as follows:
| Years Ended December 31,
| 2016 |  | 2015 |  | 2014
| (in thousands)
2018 Notes coupon interest at a rate of 1.125% | $ | 1,553 |  |  | $ | 1,567 |  |  | $ | 1,567 |
2018 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 5.5% | 6,749 |  |  | 6,372 |  |  | 6,019 |
2014 Notes coupon interest at a rate of 5% | — |  |  | — |  |  | 3,929 |
2014 Notes amortization of discount at an additional effective interest rate of 11.7% | — |  |  | — |  |  | 8,744 |
Total interest expense on convertible notes | $ | 8,302 |  |  | $ | 7,939 |  |  | $ | 20,259 |

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- Definition Tabular disclosure for the reclassification of debt issuance cost reported in the balance sheet. + References No definition available. + Details
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- Definition Tabular disclosure of the amounts of interest expense related to convertible notes during the reporting period. + References No definition available. + Details
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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