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Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2020
3.75% Convertible Senior Notes |
Debt Instrument [Line Items] |
Schedule of Convertible Senior Notes | The 3.75% Convertible Senior Notes consisted of the following (in thousands): ​
​ | ​ | ​
​ | June 30,
​ | 2020
Principal amounts: | ​ | ​
Principal | $ | 212,463
Unamortized debt discount (1) | ​ | (133,321)
Unamortized debt issuance costs (1) | ​ | (2,517)
Net carrying amount | $ | 76,625
Carrying amount of the equity component (2) | $ | 130,249
| 1) | Included in the unaudited interim condensed consolidated balance sheets within the 3.75% Convertible Senior Notes, net and amortized over the remaining life of the notes using the effective interest rate method.
​
| 2) | Included in the unaudited interim condensed consolidated balance sheets within additional paid-in capital, net of $4.4 million in equity issuance costs and associated income tax benefit of $12.4 million.
5.5% Convertible Senior Notes |
Debt Instrument [Line Items] |
Schedule of Convertible Senior Notes | The 5.5% Convertible Senior Notes consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ | June 30, | ​ | December 31,
​ | 2020 | ​ | 2019
Principal amounts: | ​ | ​ | ​ | ​ | ​
Principal | $ | 33,660 | ​ | $ | 100,000
Unamortized debt discount (1) | ​ | (8,126) | ​ | ​ | (27,818)
Unamortized debt issuance costs (1) | ​ | (443) | ​ | ​ | (1,567)
Net carrying amount | $ | 25,091 | ​ | $ | 70,615
Carrying amount of the equity component (2) | $ | — | ​ | $ | 37,702
1)Included in the unaudited interim condensed consolidated balance sheets within the 5.5% Convertible Senior Notes, net and amortized over the remaining life of the 5.5% Convertible Senior Notes using the effective interest rate method. ​ 2)Included in the unaudited interim condensed consolidated balance sheets within additional paid-in capital, net of $1.7 million in equity issuance costs and associated income tax benefit of $9.2 million, at December 31, 2019. ​
Schedule of net proceeds from the Convertible Senior Notes | ​
​ | ​ | ​
​ | Amount
​ | (in thousands)
Principal amount | $ | 100,000
Less initial purchasers’ discount | ​ | (3,250)
Less cost of related capped call and common stock forward | ​ | (43,500)
Less other issuance costs | ​ | (894)
Net proceeds | $ | 52,356
7.5% Convertible Senior Note |
Debt Instrument [Line Items] |
Schedule of Convertible Senior Notes | The 7.5% Convertible Senior Note consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ | June 30, | ​ | December 31,
​ | 2020 | ​ | 2019
Principal amounts: | ​ | ​ | ​ | ​ | ​
Principal at maturity | $ | 48,000 | ​ | $ | 48,000
Unamortized debt discount | ​ | (6,200) | ​ | ​ | (7,400)
Unamortized debt issuance costs | ​ | (812) | ​ | ​ | (969)
Net carrying amount | $ | 40,988 | ​ | $ | 39,631

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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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