Divestitures	12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]
Divestitures	Divestitures The Company recognized an aggregate net gain (loss) on sale of assets of $(11.6) million, $(1.9) million and $3.9 million for the years ended December 31, 2017, 2016 and 2015, respectively. In September 2017, the Company sold certain proved and unproved oil and gas properties and related pipeline assets located in West Virginia, Virginia and Ohio for $41.3 million, and recognized an $11.9 million loss on sale of assets. During the second quarter of 2017, the Company had classified these assets as held for sale and recorded an impairment charge of $68.6 million associated with the proposed sale of these properties. In February 2016, the Company completed the divestiture of certain proved and unproved oil and gas properties in east Texas for $56.4 million and recognized a $0.5 million gain on sale of assets. The purchase price included a $6.3 million deposit that was received in the fourth quarter of 2015.

Divestitures

12 Months Ended

Dec. 31, 2017

The Company recognized an aggregate net gain (loss) on sale of assets of $(11.6) million, $(1.9) million and $3.9 million for the years ended December 31, 2017, 2016 and 2015, respectively.

In September 2017, the Company sold certain proved and unproved oil and gas properties and related pipeline assets located in West Virginia, Virginia and Ohio for $41.3 million, and recognized an $11.9 million loss on sale of assets. During the second quarter of 2017, the Company had classified these assets as held for sale and recorded an impairment charge of $68.6 million associated with the proposed sale of these properties.

In February 2016, the Company completed the divestiture of certain proved and unproved oil and gas properties in east Texas for $56.4 million and recognized a $0.5 million gain on sale of assets. The purchase price included a $6.3 million deposit that was received in the fourth quarter of 2015.