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2.25% Convertible Senior Notes Due 2019 (Tables) | 6 Months Ended
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Jun. 30, 2015
2.25% Convertible Senior Notes Due 2019 [Abstract] |
Carrying Amounts of Liability and Equity Components |
| June 30, 2015 |  | December 31, 2014
|  | (In thousands)
Amount of the equity component (1) | $ | 45,808 |  | $ | 45,808
2.25% convertible senior notes due 2019 | $ | 330,000 |  | $ | 330,000
Unamortized debt discount (2) |  | (38,588) |  |  | (42,844)
Unamortized transaction costs related to the debt component |  | (5,933) |  |  | (6,526)
Contractual coupon interest accrual |  | 3,713 |  |  | 3,733
Contractual coupon interest payment |  | (3,713) |  |  | (3,733)
Net carrying amount | $ | 285,479 |  | $ | 280,630
| (1) |  | Net of $1,177 thousands of transaction costs related to the equity component of the Notes.
| (2) |  | As of June 30, 2015, the remaining period over which the unamortized debt discount will be amortized is 4 years.
Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount |
| Six-month period ended June 30, 2015 |  | Three-month period ended June 30, 2015
| (In thousands) |  | (In thousands)
Contractual coupon interest expense | $ | 3,713 |  | $ | 1,857
Amortization of debt discount |  | 4,256 |  |  | 2,128
Amortization of debt issuance costs |  | 593 |  |  | 294
Total interest expense related to Notes | $ | 8,562 |  | $ | 4,279

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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 Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
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