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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

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