LONG-TERM DEBT LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013			2012
	(in thousands)
Senior notes:
3.25% Convertible senior notes due 2016:
Principal amount	$	115,000		$	115,000
Unamortized discount	(10,010		)	(13,671		)
3.25% Convertible senior notes due 2016, net of discount	104,990			101,329
7.75% Senior notes due 2022:
7.75% Senior notes due 2022	500,000			500,000
Total senior notes	604,990			601,329
Credit facilities:
Corporate	—			49,000
PDCM	37,000			26,250
Total credit facilities	37,000			75,250
PDCM second lien term loan	15,000			—
Long-term debt	$	656,990		$	676,579