Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Convertible Debt

The Convertible Notes consist of the following (in thousands):

	March 31, 2019			December 31, 2018
Liability component
Principal	$	1,164,497		$	1,164,497
Less: note discount and issuance costs	(1,298		)	(9,052		)
Net carrying amount	$	1,163,199		$	1,155,445
Equity component
Temporary equity	$	1,163		$	8,110
Additional paid-in capital	134,321			127,374
Total (including temporary equity)	$	135,484		$	135,484

Schedule of Interest Expense Recognized Related to Convertible Notes

The following table includes total interest expense recognized related to the Convertible Notes and the 2027 Notes (in thousands):

	Three Months Ended
	March 31,
	2019		2018
Contractual interest expense	$	9,893	$	10,235
Amortization of debt issuance costs	989		1,005
Amortization of debt discount	6,987		8,665
	$	17,869	$	19,905