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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
The following table reconciles our AROs as of the dates presented, which are included in the “Other liabilities” caption on our Consolidated Balance Sheets: 
 
Successor
 
 
Predecessor
 
Period From September 13, 2016
 
 
Period From January 1, 2016
 
December 31,
 
Through December 31, 2016
 
 
Through September 12, 2016
 
2015
Balance at beginning of period
$
2,687

 
 
$
2,621

 
$
5,890

Fresh Start Accounting adjustment
—

 
 
(754
)
 
—

Changes in estimates
27

 
 
176

 
172

Liabilities incurred
—

 
 
469

 
110

Liabilities settled
(311
)
 
 
—

 
—

Sale of properties
—

 
 
—

 
(3,932
)
Accretion expense
56

 
 
175

 
381

Balance at end of period
$
2,459

 
 
$
2,687

 
$
2,621