Nature of operations and summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Components of accounts receivable

Accounts receivable consisted of the following:

	Successor			Predecessor
	December 31,			December 31,
	2017			2016
Joint interests	$	29,032		$	13,818
Accrued commodity sales		26,516			31,304
Derivative settlements		157			—
Other		5,326			1,657
Allowance for doubtful accounts		(668	)		(553	)
	$	60,363		$	46,226

Components of inventory

Inventories consisted of the following:

	Successor			Predecessor
	December 31,			December 31,
	2017			2016
Equipment inventory	$	4,163		$	8,165
Commodities		1,154			1,418
Inventory valuation allowance		(179	)		(2,232	)
	$	5,138		$	7,351

Adjustments to inventory

We recorded lower of cost or net realizable value adjustments, for the periods disclosed below, due to depressed industry conditions which resulted in lower demand for such equipment and hence lower market prices, as well as due to obsolescence. These adjustments are reflected in “Loss on impairment of other assets” in our consolidated statements of operations.

	Successor		Predecessor
	Period from		Period from
	March 22, 2017		January 1, 2017
	through		through		Year ended December 31,
	December 31, 2017		March 21, 2017		2016		2015
Inventory - valuation adjustment	$	179	$	—	$	1,393	$	10,192

Schedule Of Estimated Useful Lives for Property and Equipment

Estimated useful lives of our assets are as follows:

Furniture and fixtures	10 years
Automobiles and trucks	5 years
Machinery and equipment	10 — 20 years
Office and computer equipment	5 — 10 years
Building and improvements	10 — 40 years

Components of cost reduction initiatives expense

The expense consists of costs for one-time severance and termination benefits in connection with our reductions in force and third party legal and professional services we have engaged to assist in our cost savings initiatives as follows:

	Successor		Predecessor
	Period from		Period from
	March 22, 2017		January 1, 2017
	through		through		Year ended December 31,
	December 31, 2017		March 21, 2017		2016		2015
One-time severance and termination benefits	$	678	$	608	$	2,772	$	7,757
Professional fees		13		21		107		2,271
Total cost reduction initiatives expense	$	691	$	629	$	2,879	$	10,028