Convertible Senior Notes (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

The Notes consist of the following components (in thousands):

	March 31, 2015			December 31, 2014
Liability component:
Principal	$	690,000		$	690,000
Less: debt discount, net of amortization	(80,353		)	(85,149		)
Net carrying amount	$	609,647		$	604,851
Equity component:	$	101,276		$	101,276

Schedule of Interest Expense

The following table sets forth total interest expense included in the statements of income related to the Notes (in thousands):

	For the Three Months Ended March 31,
	2015			2014
Amortization of debt discount	$	455		$	188
Amortization of debt issuance costs	4,796			1,990
Capitalization of interest expense	(675		)	(237		)
Total interest expense	$	4,576		$	1,941