Convertible Senior Notes (Tables) - 3.75% Convertible Senior Notes

3 Months Ended

Mar. 31, 2021

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):

	March 31,
	2021
Principal amounts:
Principal	$	197,278
Unamortized debt issuance costs (1)		(5,510)
Net carrying amount	$	191,768

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.

Schedule of debt

The following table summarizes the total interest expense and effective interest rate related to the 3.75% Convertible Senior Notes (in thousands, except for effective interest rate):

	March 31,
	2021
Interest Expense	$	1,897
Amortization of Debt Issuance Costs		1,258
Total		3,155
Effective Interest Rate		4.5%