Tax effects of temporary differences representing the net DTA (DTL) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
DTA, Alternative minimum tax credits	$ 2,000
Successor [Member]
Deferred tax assets:
DTA, Federal net operating losses (NOLs)	58,438	$ 40,104
DTA, Oil and gas exploration and development costs	0	71,292
DTA, Alternative minimum tax credits	138	2,092
DTA, Other loss carryforwards	619	1,107
DTA, Asset retirement obligations	2,329	11,447
Deferred Tax Assets, Hedging Transactions	29	5,802
DTA, Unrealized share-based compensation	872	648
DTA, Other	2,190	4,164
DTA, Valuation Allowance	(58,398)	(136,656)
Total deferred tax assets	6,217	0
Deferred tax liabilities:
DTL, Oil and gas exploration and development costs	(6,054)	0
DTL, Other	(163)	0
Total deferred tax liabilites	6,217	0
Net deferred tax liabilities	$ 0	$ 0