Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2017

Asset Retirement Obligation Disclosure [Abstract]

Reconciliation of Asset Retirement Obligations which are Included in Other Liabilities

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
	Year Ended			September 13 Through			January 1 Through
	December 31,			December 31,			September 12,
	2017			2016			2016
Balance at beginning of period	$	2,459		$	2,687		$	2,621
Fresh Start Accounting adjustment	—			—			(754		)
Changes in estimates	118			27			176
Liabilities incurred	149			—			469
Liabilities settled	(139		)	(311		)	—
Purchase of properties	494			—			—
Accretion expense	205			56			175
Balance at end of period	$	3,286		$	2,459		$	2,687