Discontinued Operations (Predecessor) (Schedule of Operations and Other Items Reclassified n Discontinued Operations) (Details) - Predecessor - Weeks Island Field, Louisiana - Non Stack Assets - Disposed of by Sale - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 08, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Oil	$ 1,617	$ 47,218	$ 57,866
Natural gas	1,023	10,090	10,932
Natural gas liquids	236	2,359	1,489
Other	16	316	213
Operating revenue	2,892	59,983	70,500
Loss on sale of assets	(1,923)	(22,207)	3,539
Gain on acquisition of oil and gas properties	0	1,626	0
Total revenue	969	39,402	74,039
Operating expenses:
Lease operating	1,770	27,763	29,474
Transportation and marketing	83	1,354	1,698
Production taxes	167	6,730	7,985
Workover	127	2,088	1,273
Exploration	0	11,431	7,547
Depreciation, depletion and amortization	884	24,519	41,320
Impairments of assets	5,560	29,129	15,924
General and administrative	21	82	1,290
Total operating expenses	8,612	103,096	106,511
Interest expense	(103)	(1,209)	(1,209)
Interest income and other	0	88	10
Total other income (expense)	(103)	(1,121)	(1,199)
Income tax provision (benefit)	0	0	(29)
Loss from discontinued operations, net of state income taxes	$ (7,746)	$ (64,815)	$ (33,642)