Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

The 2027 Notes consisted of the following components as of December 31, 2019 (in thousands):

	December 31, 2019
Liability component:
Principal	$	1,150,000
Less: debt discount and issuance costs, net of amortization	(222,928		)
Net carrying amount	$	927,072
Equity component:	$	220,529

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

	December 31, 2019			December 31, 2018
Liability component:
Principal	$	1,150,000		$	1,150,000
Less: debt discount and issuance costs, net of amortization	(237,281		)	(275,920		)
Net carrying amount	$	912,719		$	874,080
Equity component:	$	285,225		$	285,225

Schedule of Interest Expense

The following table sets forth total interest expense included in the consolidated statements of income for the years ended December 31, 2019, 2018 and 2017 (in thousands):

	2019			2018			2017
Amortization of debt discount and issuance costs	$	52,059		$	46,493		$	22,826
Coupon interest payable on 2025 Notes	1,436			874			—
Coupon interest payable on 2027 Notes	1,557			—			—
Revolving credit facility contractual interest expense	513			368			—
Capitalization of interest expense	(6,201		)	(4,533		)	(3,987		)
Total interest expense	$	49,364		$	43,202		$	18,839