Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Measurements [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

	June 30, 2013					December 31, 2012
	(In thousands)
		Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
8.25% Senior Notes	$	496,106	$	525,300	$	494,911	$	524,600
Senior Credit Facility		165,000		165,000		195,000		195,000
Total	$	661,106	$	690,300	$	689,911	$	719,600

Schedule of Fair Value Measurements of Derivative Instruments

	June 30,		December 31,
	2013		2012
Fair value of commodity derivative instruments:	(in thousands)
Assets:
Current	$	10,758	$	3,302
Noncurrent		7,600		211
Total gross fair value		18,358		3,513
Less: counterparty set-off		(1,208)		(3,513)
Total net fair value		17,150		-
Liabilities:
Current	$	1,208	$	10,026
Noncurrent		-		3,637
Total gross fair value		1,208		13,663
Less: counterparty set-off		(1,208)		(3,513)
Total net fair value		-		10,150