Property, Plant and Equipment

9 Months Ended

Sep. 30, 2016

Property, Plant and Equipment [Abstract]

Property, plant and equipment consists of the following (in thousands):



	September 30, 2016			December 31, 2015
Oil and natural gas properties
Proved(1)	$	12,093,492		$	12,529,681
Unproved	322,580			363,149
Total oil and natural gas properties	12,416,072			12,892,830
Less accumulated depreciation, depletion and impairment	(11,637,538		)	(11,149,888		)
Net oil and natural gas properties capitalized costs	778,534			1,742,942
Land	5,210			14,260
Non-oil and natural gas equipment(2)	240,402			373,687
Buildings and structures(3)	228,753			227,673
Total	474,365			615,620
Less accumulated depreciation and amortization	(116,837		)	(123,860		)
Other property, plant and equipment, net	357,528			491,760
Total property, plant and equipment, net	$	1,136,062		$	2,234,702

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(1)	Includes cumulative capitalized interest of approximately $51.1 million and $48.9 million at September 30, 2016 and December 31, 2015, respectively.


(2)	Includes cumulative capitalized interest of approximately $4.3 million at both September 30, 2016 and December 31, 2015.


(3)	Includes cumulative capitalized interest of approximately $20.4 million at both September 30, 2016 and December 31, 2015.

The Company reduced the net carrying value of its oil and natural gas properties by $298.0 million and $657.4 million during the three and nine-month periods ended September 30, 2016, as a result of its quarterly full cost ceiling analysis. See Note 2 for discussion of the proportionate consolidation of the Royalty Trusts for the three and nine-month periods ended September 30, 2016.

The Company reviews non-oil and natural gas equipment and buildings and structures for recoverability whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. The Company recognizes an impairment loss if the carrying amount of a long-lived asset is not recoverable and exceeds its fair value. The electrical transmission system was reviewed and was determined to not be recoverable due to a decrease in projected Mid-Continent production volumes supporting the system’s usage. Further, the carrying value exceeded its fair value. The Company recorded an impairment of $55.6 million on its electrical transmission system during the three and nine-month periods ended September 30, 2016 and a $1.7 million impairment on compressors and various other midstream services equipment during the nine-month period ended September 30, 2016 due primarily to the determination that their future use was limited.

Fair value measurements for the electrical asset impairment discussed above were based on replacement cost. As the fair value was estimated using the cost approach, inputs were based on the cost to a market participant buyer to acquire or construct a substitute asset of comparable utility, adjusted for obsolescence. These inputs were not observable in the market therefore these values were classified as Level 3 in the fair value hierarchy.

The Company disposed of certain drilling and oilfield services assets previously classified as held for sale during 2016 and recorded losses on the sale of those assets of $0.1 million and $1.7 million for the three and nine-month periods ended September 30, 2016, which are included in loss (gain) on sale of assets in the accompanying unaudited condensed consolidated statements of operations. At September 30, 2016, the Company has remaining drilling and oilfield services assets with a net book value of $0.8 million classified as held for sale in the other current assets line of the accompanying unaudited condensed consolidated balance sheet, and expects to dispose of these assets in the fourth quarter of 2016.