Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

The 2019 Notes consist of the following components as of June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018			December 31, 2017
Liability component:
Principal	$	690,000		$	690,000
Less: debt discount and issuance costs, net of amortization	(15,371		)	(27,087		)
Net carrying amount	$	674,629		$	662,913
Equity component:	$	101,276		$	101,276

The 2025 Notes consist of the following components as of June 30, 2018 (in thousands):

	June 30, 2018
Liability component:
Principal	$	1,150,000
Less: debt discount and issuance costs, net of amortization	(294,622		)
Net carrying amount	$	855,378
Equity component:	$	285,225

Schedule of Interest Expense

The following table sets forth total interest expense included in the consolidated statements of income for the three and six months ended June 30, 2018 and 2017 (in thousands):

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Amortization of debt discount and issuance costs	$	9,917		$	5,681		$	15,749		$	11,313
Coupon interest payable on 2025 Notes	156			—			156			—
Revolving credit facility contractual interest expense	139			—			139			—
Capitalization of interest expense	(1,008		)	(1,035		)	(1,990		)	(2,070		)
Total interest expense	$	9,204		$	4,646		$	14,054		$	9,243