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Convertible Senior Notes (Tables) - Convertible Senior Notes [Member] | 6 Months Ended
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Jun. 30, 2019
2028 Convertible Senior Notes [Member] |
Debt Instrument [Line Items] |
Carrying Amounts of Liability and Equity Components |
| June 30, 2019 |  | December 31, 2018
| (In thousands)
Amount of the equity component (1) | $ | 327,305 |  | $ | 327,305
2.00% Convertible Senior Notes due 2028 | $ | 880,000 |  | $ | 880,000
Unamortized debt discount (2) |  | (313,498) |  |  | (325,783)
Unamortized transaction costs related to the debt component |  | (9,719) |  |  | (9,958)
Contractual coupon interest accrual |  | 15,009 |  |  | 5,867
Contractual coupon interest payment |  | (8,360) |  |  | —
Net carrying amount | $ | 563,432 |  | $ | 550,126
(1)Net of $6,163 thousands of transaction costs related to the equity component of the 2028 Notes. (2)As of June 30, 2019, the remaining period over which the unamortized debt discount will be amortized is 9.2 years.
Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount |
| Six month periods ended June 30, |  | Three month periods ended June 30,
| 2019 |  | 2019
| (In thousands)
Contractual coupon interest expense | $ | 9,142 |  | $ | 4,400
Amortization of debt discount |  | 12,285 |  |  | 5,968
Amortization of debt issuance costs |  | 239 |  |  | 117
Total interest expense related to the 2028 Notes | $ | 21,666 |  | $ | 10,485
2019 Convertible Senior Notes [Member] |
Debt Instrument [Line Items] |
Carrying Amounts of Liability and Equity Components |
| June 30, 2019 |  | December 31, 2018
| (In thousands)
Amount of the equity component (1) | $ | 9,196 |  | $ | 9,196
2.25% Convertible Senior Notes due 2019 | $ | 65,978 |  | $ | 65,987
Unamortized debt discount |  | — |  |  | (1,063)
Unamortized transaction costs related to the debt component |  | — |  |  | (176)
Contractual coupon interest accrual |  | 745 |  |  | 5,447
Contractual coupon interest payment |  | (745) |  |  | (5,447)
Net carrying amount | $ | 65,978 |  | $ | 64,748
(1)Net of $236 thousands of transaction costs related to the equity component of the 2019 Notes.
Summary of Interest Expense for Contractual Interest and Accretion of Debt Discount |
| Six month periods ended June 30, |  |  | Three month periods ended June 30,
| 2019 |  | 2018 |  |  | 2019 |  | 2018
| (In thousands) |  |  | (In thousands)
Contractual coupon interest expense | $ | 745 |  | $ | 3,713 |  |  | $ | 372 |  | $ | 1,857
Amortization of debt discount |  | 1,063 |  |  | 5,016 |  |  |  | 532 |  |  | 2,508
Amortization of debt issuance costs |  | 176 |  |  | 798 |  |  |  | 88 |  |  | 399
Total interest expense related to the 2019 Notes | $ | 1,984 |  | $ | 9,527 |  |  | $ | 992 |  | $ | 4,764

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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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