Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt consists of the following:

	March 31, 2016			December 31, 2015
	(in thousands)
Senior notes:
3.25% Convertible senior notes due 2016:
Principal amount	$	115,000		$	115,000
Unamortized discount	(747		)	(1,852		)
Unamortized debt issuance costs	(70		)	(208		)
3.25% Convertible senior notes due 2016, net of discount and unamortized debt issuance costs	114,183			112,940
7.75% Senior notes due 2022:
Principal amount	500,000			500,000
Unamortized debt issuance costs	(7,283		)	(7,563		)
7.75% Senior notes due 2022, net of unamortized debt issuance costs	492,717			492,437
Total senior notes	606,900			605,377
Revolving credit facility	—			37,000
Total debt, net of discount and unamortized debt issuance costs	606,900			642,377
Less current portion of long-term debt	114,183			112,940
Long-term debt	$	492,717		$	529,437