Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

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

	June 30, 2015			December 31, 2014
Liability component:
Principal	$	690,000		$	690,000
Less: debt discount, net of amortization	(75,516		)	(85,149		)
Net carrying amount	$	614,484		$	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 June 30,						For the Six Months Ended June 30,
	2015			2014			2015			2014
Amortization of debt discount	$	459		$	442		$	914		$	630
Amortization of debt issuance costs	4,838			4,671			9,634			6,661
Capitalization of interest expense	(619		)	(597		)	(1,294		)	(834		)
Total interest expense	$	4,678		$	4,516		$	9,254		$	6,457