Properties and Equipment (Tables)

9 Months Ended

Sep. 30, 2017

Long Lived Assets Held-for-sale [Line Items]

Disclosure of Long Lived Assets Held-for-sale [Table Text Block]

The following table presents balance sheet data related to assets held-for-sale, which include the Utica Shale properties, field office facilities, and a parcel of land that are being marketed for sale. Assets held-for-sale represents the assets that are expected to be sold, net of liabilities, that are expected to be assumed by the purchasers:    

	September 30, 2017		December 31, 2016
	(in thousands)
Assets
Properties and equipment, net	$	41,983	$	5,272
Total assets	$	41,983	$	5,272
Liabilities
Asset retirement obligation	$	499	$	—
Total liabilities	$	499	$	—
Net assets	$	41,484	$	5,272

Property, Plant and Equipment

The following table presents the components of properties and equipment, net of accumulated depreciation, depletion, and amortization ("DD&A"):

	September 30, 2017			December 31, 2016
	(in thousands)
Properties and equipment, net:
Crude oil and natural gas properties
Proved	$	3,759,501		$	3,499,718
Unproved	1,559,717			1,874,671
Total crude oil and natural gas properties	5,319,218			5,374,389
Infrastructure, pipeline, and other	104,568			62,093
Land and buildings	10,714			6,392
Construction in progress	177,341			122,591
Properties and equipment, at cost	5,611,841			5,565,465
Accumulated DD&A	(1,729,141		)	(1,562,471		)
Properties and equipment, net	$	3,882,700		$	4,002,994

Impairment of natural gas and crude oil properties

The following table presents impairment charges recorded for crude oil and natural gas properties:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	(in thousands)
Impairment of unproved properties	$	252,623	$	338	$	282,188	$	2,391
Amortization of individually insignificant unproved properties	117		595		311		681
Impairment of crude oil and natural gas properties	252,740		933		282,499		3,072
Land and buildings	—		—		—		3,032
Total impairment of properties and equipment	$	252,740	$	933	$	282,499	$	6,104