Senior Convertible Notes (Tables)

9 Months Ended

Sep. 30, 2014

Debt Disclosure [Abstract]

Net carrying amount of the debt component

The carrying values of the Company's Senior Convertible Notes are as follows:

(in thousands)	September 30, 2014			December 31, 2013
2.75% Senior Convertible Notes due 2017:
Principal amount	$	402,500		$	402,500
Unamortized debt discount	(45,526		)	(56,440		)
Total Senior Convertible Notes, net	$	356,974		$	346,060