Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

The Notes consist of the following components as of December 31, 2017 and 2016 (in thousands):

	December 31, 2017			December 31, 2016
Liability component:
Principal	$	690,000		$	690,000
Less: debt discount and issuance costs, net of amortization	(27,087		)	(49,913		)
Net carrying amount	$	662,913		$	640,087
Equity component:	$	101,276		$	101,276

Schedule of Interest Expense

The following table sets forth total interest expense included in the consolidated statements of income related to the Notes for the years ended December 31, 2017 and 2016 (in thousands):

	2017			2016
Amortization of debt discount and issuance costs	$	22,826		$	22,040
Capitalization of interest expense	(3,987		)	(3,402		)
Total interest expense	$	18,839		$	18,638