Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2020

3.75% Convertible Senior Notes

Debt Instrument [Line Items]

Schedule of net proceeds from the Convertible Senior Notes

	Amount
	(in thousands)
Principal amount	$	212,463
Less initial purchasers' discount		(6,374)
Less cost of related capped calls		(16,253)
Less other issuance costs		(617)
Net proceeds	$	189,219

Schedule of Convertible Senior Notes

The 3.75% Convertible Senior Notes consisted of the following (in thousands):

	December 31,
	2020
Principal amounts:
Principal	$	212,463
Unamortized debt discount (1)		(124,655)
Unamortized debt issuance costs (1)		(2,295)
Net carrying amount	$	85,513
Carrying amount of the equity component (2)	$	130,249

1) Included in the 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 consolidated balance sheets within additional paid-in capital, net of the associated income tax benefit of $29.8 million.

5.5% Convertible Senior Notes

Debt Instrument [Line Items]

Schedule of net proceeds from the Convertible Senior Notes

	December 31,		December 31,
	2020		2019
Principal amounts:
Principal	$	160	$	100,000
Unamortized debt discount (1)		(32)		(27,818)
Unamortized debt issuance costs (1)		(1)		(1,567)
Net carrying amount	$	127	$	70,615
Carrying amount of the equity component (2)	$	—	$	37,702