LONG-TERM DEBT LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2012

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,
	2012			2011
	(in thousands)
Senior notes
3.25% Convertible senior notes due 2016:
Principal amount	$	115,000		$	115,000
Unamortized discount	(13,671		)	(17,079		)
3.25% Convertible senior notes due 2016, net of discount	101,329			97,921
7.75% Senior notes due 2022:
Principal amount	500,000			—
12% Senior notes due 2018:
Principal amount	—			203,000
Unamortized discount	—			(1,764		)
12% Senior notes due 2018, net of discount	—			201,236
Total senior notes	601,329			299,157
Credit facilities
Corporate	49,000			209,000
PDCM	26,250			24,000
Total credit facilities	75,250			233,000
Total long-term debt	$	676,579		$	532,157