Divestitures	12 Months Ended
Dec. 31, 2018
Business Combinations [Abstract]
Divestitures	Divestitures The Company recognized an aggregate net loss on sale of assets of $16.3 million, $11.6 million and $1.9 million for the years ended December 31, 2018, 2017 and 2016, respectively. In July 2018, the Company sold certain proved and unproved oil and gas properties in the Haynesville Shale to a third party for $30.0 million. The sales price included a $5.0 million deposit that was received in the fourth quarter of 2017. During the fourth quarter of 2017, the Company classified these assets as held for sale. The Company recognized a gain on sale of oil and gas properties of $29.7 million. In February 2018, the Company sold certain proved and unproved oil and gas properties in the Eagle Ford Shale to an affiliate of Venado Oil & Gas LLC for $765.0 million. The sales price included a $76.5 million deposit that was received in the fourth quarter of 2017. During the fourth quarter of 2017, the Company classified these assets as held for sale and recorded an impairment charge of $414.3 million associated with the proposed sale of these properties. The Company recognized a loss on sale of oil and gas properties of $45.4 million. 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 to an affiliate of Carbon Natural Gas Company 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

The Company recognized an aggregate net loss on sale of assets of $16.3 million, $11.6 million and $1.9 million for the years ended December 31, 2018, 2017 and 2016, respectively.

In July 2018, the Company sold certain proved and unproved oil and gas properties in the Haynesville Shale to a third party for $30.0 million. The sales price included a $5.0 million deposit that was received in the fourth quarter of 2017. During the fourth quarter of 2017, the Company classified these assets as held for sale. The Company recognized a gain on sale of oil and gas properties of $29.7 million.

In February 2018, the Company sold certain proved and unproved oil and gas properties in the Eagle Ford Shale to an affiliate of Venado Oil & Gas LLC for $765.0 million. The sales price included a $76.5 million deposit that was received in the fourth quarter of 2017. During the fourth quarter of 2017, the Company classified these assets as held for sale and recorded an impairment charge of $414.3 million associated with the proposed sale of these properties. The Company recognized a loss on sale of oil and gas properties of $45.4 million.

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 to an affiliate of Carbon Natural Gas Company 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.