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Convertible Senior Notes (Tables) - Convertible Senior Notes [Member]
6 Months Ended
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