DEBT (Tables)

9 Months Ended

Sep. 30, 2014

Debt Disclosure [Abstract]

Schedule of components of the entity's Convertible Senior Notes

Long-term debt, net is comprised of our Convertible Senior Notes, as follows:

	September 30, 2014			December 31, 2013
	(in thousands)
2020 Convertible Senior Notes
Principal amount outstanding	$	450,000		$	450,000
Unamortized discount	(100,763		)	(111,015		)
Net carrying amount	349,237			338,985
2018 Convertible Senior Notes
Principal amount outstanding	350,000			350,000
Unamortized discount	(56,312		)	(65,733		)
Net carrying amount	293,688			284,267
2017 Convertible Senior Notes
Principal amount outstanding	228,809			228,822
Unamortized discount	(28,241		)	(34,244		)
Net carrying amount	200,568			194,578
Total Convertible Senior Notes
Principal amount outstanding	1,028,809			1,028,822
Unamortized discount	(185,316		)	(210,992		)
Net carrying amount	$	843,493		$	817,830