Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

The 2025 Notes consisted of the following components as of September 30, 2019 and December 31, 2018 (in thousands):

	September 30, 2019			December 31, 2018
Liability component:
Principal	$	1,150,000		$	1,150,000
Less: debt discount and issuance costs, net of amortization	(247,098		)	(275,920		)
Net carrying amount	$	902,902		$	874,080
Equity component:	$	285,225		$	285,225

The 2027 Notes consisted of the following components as of September 30, 2019 (in thousands):

	September 30, 2019
Liability component:
Principal	$	1,150,000
Less: debt discount and issuance costs, net of amortization	(229,454		)
Net carrying amount	$	920,546
Equity component:	$	220,529

Schedule of Interest Expense

The following table sets forth total interest expense included in the consolidated statements of income for the three and nine months ended September 30, 2019 and 2018 (in thousands):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2019			2018			2019			2018
Amortization of debt discount and issuance costs	$	12,982		$	15,295		$	35,657		$	31,045
Coupon interest payable on 2025 Notes	359			359			1,077			514
Coupon interest payable on 2027 Notes	479			—			479			—
Revolving credit facility contractual interest expense	156			122			372			261
Capitalization of interest expense	(1,849		)	(1,210		)	(4,896		)	(3,200		)
Total interest expense	$	12,127		$	14,566		$	32,689		$	28,620