LONG-TERM DEBT LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2015

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt consists of the following:

	As of December 31,
	2015			2014
	(in thousands)
Senior notes:
3.25% Convertible senior notes due 2016:
Principal amount	$	115,000		$	115,000
Unamortized discount	(1,852		)	(6,077		)
Unamortized debt issuance costs	(208		)	(765		)
3.25% Convertible senior notes due 2016, net of discount and unamortized debt issuance costs	112,940			108,158
7.75% Senior notes due 2022:
Principal amount	500,000			500,000
Unamortized debt issuance costs	(7,563		)	(8,683		)
7.75% Senior notes due 2022, net of unamortized debt issuance costs	492,437			491,317
Total senior notes	605,377			599,475
Revolving credit facility	37,000			56,000
Total debt, net of discount and unamortized debt issuance costs	642,377			655,475
Less current portion of long-term debt	112,940			—
Long-term debt	$	529,437		$	655,475