Property, Plant And Equipment (Tables)

9 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

	September 30, 2015			December 31, 2014
	(in thousands)
	(Restated)
Oil and gas properties
Subject to depletion	$	5,687,844		$	5,821,167
Unevaluated costs	21,377			18,803
Accumulated depletion	(5,367,733		)	(5,225,302		)
Net oil and gas properties	341,488			614,668
Other property and equipment
Pipelines and processing facilities	293,859			316,013
General properties	63,288			66,455
Accumulated depreciation	(257,815		)	(268,356		)
Net other property and equipment	99,332			114,112
Property, plant and equipment, net of accumulated depletion and depreciation	$	440,820		$	728,780