Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

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

	September 30, 2015			December 31, 2014
Liability component:
Principal	$	690,000		$	690,000
Less: debt discount, net of amortization	(70,635		)	(85,149		)
Net carrying amount	$	619,365		$	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 September 30,						For the Nine Months Ended September 30,
	2015			2014			2015			2014
Amortization of debt discount	$	463		$	449		$	1,377		$	1,079
Amortization of debt issuance costs	4,881			4,712			14,515			11,373
Capitalization of interest expense	(714		)	(679		)	(2,008		)	(1,513		)
Total interest expense	$	4,630		$	4,482		$	13,884		$	10,939