Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

The Notes consisted of the following components as of December 31, 2015 (in thousands):

	December 31, 2015
Liability component:
Principal	$	690,000
Less: debt discount, net of amortization	(65,712		)
Net carrying amount	$	624,288
Equity component:	$	101,276

Schedule of Interest Expense

The following table sets forth total interest expense included in the statement of income related to the Notes for the years ended December 31, 2015 and 2014 (in thousands):

	2015			2014
Amortization of debt discount	$	19,436		$	16,127
Amortization of debt issuance costs	1,844			1,531
Capitalization of interest expense	(2,755		)	(2,195		)
Total interest expense	$	18,525		$	15,463