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Asset Impairments (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Impairment Charges [Abstract]  
Summary of Asset Impairments

 

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

Proved oil and gas assets

 

$

—

 

 

$

435

 

 

$

16,076

 

EnLink goodwill

 

 

—

 

 

 

873

 

 

 

1,328

 

EnLink other intangible assets

 

 

—

 

 

 

—

 

 

 

223

 

Other assets

 

 

17

 

 

 

2

 

 

 

20

 

Total asset impairments

 

$

17

 

 

$

1,310

 

 

$

17,647

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unproved impairments

 

$

217

 

 

$

77

 

 

$

260