Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)			1 Months Ended	3 Months Ended				4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 19, 2017	Jun. 05, 2015	May 31, 2015	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2016	Aug. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 01, 2017	Oct. 01, 2017	Aug. 31, 2017
Summary Of Significant Accounting Policies [Line Items]
Deferred financing costs								$ 2,021,000		$ 2,021,000
Substantial Doubt about Going Concern, Conditions or Events										We are not in compliance with certain of the financial covenants under our credit facilities (as described in Note 7) as of December 31, 2016, as well as the requirement to deliver audited financial statements without a going concern qualification. We do not currently have sufficient liquidity to repay all of our outstanding indebtedness, and as a result, there is substantial doubt regarding our ability to continue as a going concern. In addition to the $30 million of indebtedness due on May 1, 2017, we classified the remaining $666.8 million of outstanding indebtedness under our credit facilities as a current liability, based on the occurrence of the event of default, the lenders under our credit facilities, as applicable, could elect to declare all amounts outstanding immediately due and payable and the lenders could terminate all commitments to extend further credit. In total, we have $694.8 million of outstanding indebtedness under our credit facilities, which is net of $2 million of deferred financing costs, as current portion of long term debt, net within our consolidated balance sheet as of December 31, 2016.
Allowance for Doubtful Accounts Receivable								0		$ 0	$ 0
Materials, supplies and other inventory								7,400,000		7,400,000	8,000,000
Loss on asset sales and disposal								$ 180,000			$ 1,200,000
Weighted Average Interest Rate Used To Capitalize Interest								7.60%			6.50%	5.60%
Interest Costs Capitalized								$ 100,000			$ 15,800,000	$ 13,000,000
Net carrying amount of intangible assets											500,000
Amortization of Intangible Assets								0			200,000	300,000
Intangible assets								0		$ 0
Goodwill, Period Increase (Decrease)											0
Concentration Risk, Credit Risk, Uninsured Deposits										Financial instruments, which potentially subject us to concentrations of credit risk, consist principally of periodic temporary investments of cash and cash equivalents. We place our temporary cash investments in high-quality short-term money market instruments and deposits with high-quality financial institutions and brokerage firms. We had $41.3 million and $10.3 million, respectively, in deposits at various banks at December 31, 2016 and 2015, respectively, of which $38.2 million and $8.4 million, respectively, were over the insurance limit of the Federal Deposit Insurance Corporation. No losses have been experienced on such investments to date.
Cash Equivalents, at Carrying Value								41,300,000		$ 41,300,000	10,300,000
Cash, Uninsured Amount								38,200,000		$ 38,200,000	8,400,000
Concentration Risk, Customer										We sell natural gas, crude oil and NGLs under contracts to various purchasers in the normal course of business. For the Successor period September 1, 2016 through December 31, 2016, Tenaska Marketing Ventures and Chevron within our gas and oil production segment individually accounted for approximately 22% and 15%, respectively, of our natural gas, oil and NGL consolidated revenues, excluding the impact of all financial derivative activity. For the Predecessor period January 1, 2016 through August 31, 2016, Tenaska Marketing Ventures, Chevron and Interconn Resources LLC within our gas and oil production segment individually accounted for approximately 25%, 16% and 13%, respectively, of our natural gas, oil and NGL consolidated revenues, excluding the impact of all financial derivative activity. For the Predecessor year ended December 31, 2015, Tenaska Marketing Ventures, Chevron, Enterprise and Interconn Resources LLC within our gas and oil production segment individually accounted for approximately 21%, 15%, 11% and 11%, respectively, of our natural gas, oil and NGL consolidated revenues, excluding the impact of all financial derivative activity. For the Predecessor year ended December 31, 2014, Tenaska Marketing Ventures, Chevron, Enterprise and Interconn Resources LLC within our gas and oil production segment individually accounted for approximately 25%, 15%, 14% and 13%, respectively, of our natural gas, oil and NGL consolidated revenues, excluding the impact of all financial derivative activity. We are subject to the risk of loss on our derivative instruments that we would incur as a result of non-performance by counterparties pursuant to the terms of their contractual obligations. We maintain credit policies with regard to our counterparties to minimize our overall credit risk. These policies require (i) the evaluation of potential counterparties’ financial condition to determine their credit worthiness; (ii) the quarterly monitoring of our oil, natural gas and NGLs counterparties’ credit exposures; (iii) comprehensive credit reviews of significant counterparties to physical and financial transactions on an ongoing basis; (iv) the utilization of contractual language that affords us netting or set off opportunities to mitigate exposure risk; and (v) when appropriate requiring counterparties to post cash collateral, parent guarantees or letters of credit to minimize credit risk. Our liabilities related to derivatives as of December 31, 2016 represent financial instruments from nine counterparties; all of which are financial institutions that have an “investment grade” (minimum Standard & Poor’s rating of BBB+ or better) credit rating and are lenders associated with our revolving credit facility. Subject to the terms of our revolving credit facility, collateral or other securities are not exchanged in relation to derivatives activities with the parties in the revolving credit facility.
Proportion of amount received on cost incurred to drill										15.00%
Monthly administrative fee per well										$ 75
Gathering Fee Percentage										16.00%
Gathering Fee Percentage Net Margin										3.00%
Unbilled Contracts Receivable								29,100,000		$ 29,100,000	37,700,000
Notes Receivable
Summary Of Significant Accounting Policies [Line Items]
Notes receivable								600,000		$ 600,000	3,700,000
Note agreement, maturity date										Mar. 31, 2022
Note agreement, interest rate per annum										2.25%
Note agreement, extension fee percent										1.00%
Provision for losses on Drilling Partnership receivables								$ 0
Note Agreement, Option to Extend Maturity Date
Summary Of Significant Accounting Policies [Line Items]
Note agreement, maturity date										Mar. 31, 2027
Drilling Partnership wells
Summary Of Significant Accounting Policies [Line Items]
Gathering Fee Percentage										13.00%
Customer Concentration Risk Customer 1
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage								22.00%
Customer Concentration Risk Customer 2
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage								15.00%
Arkoma Acquisition
Summary Of Significant Accounting Policies [Line Items]
Net cash acquired		$ 31,500,000
Predecessor
Summary Of Significant Accounting Policies [Line Items]
Deferred financing costs											31,055,000
Loss on asset sales and disposal									$ (479,000)		(1,181,000)	(1,869,000)
Weighted Average Interest Rate Used To Capitalize Interest									6.50%
Interest Costs Capitalized									$ 6,500,000
Net carrying amount of intangible assets											14,095,000
Amortization of Intangible Assets									500,000
Goodwill, Impairment Loss												18,100,000
Goodwill, net											13,639,000	13,600,000
Goodwill, Period Increase (Decrease)									0
Accumulated amortization								$ 172,000		$ 172,000	10,915,000
Amortization of financing costs									900,000
Provision for losses on Drilling Partnership receivables									10,906,000
Predecessor | Notes Receivable
Summary Of Significant Accounting Policies [Line Items]
Provision for losses on Drilling Partnership receivables									$ 3,100,000		$ 0	$ 0
Predecessor | Customer Concentration Risk Customer 1
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage									25.00%		21.00%	25.00%
Predecessor | Customer Concentration Risk Customer 2
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage									16.00%		15.00%	15.00%
Predecessor | Customer Concentration Risk Customer 3
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage									13.00%		11.00%	14.00%
Predecessor | Customer Concentration Risk Customer 4
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage											11.00%	13.00%
Predecessor | Arkoma Acquisition
Summary Of Significant Accounting Policies [Line Items]
Issuances of Partnership Units to Fund the Purchase Price		6,500,000	6,500,000
First Lien Facility Amendment | Revolving Credit Facility Conforming Tranche
Summary Of Significant Accounting Policies [Line Items]
Line of credit facility maximum borrowing capacity								410,000,000		410,000,000
First Lien Facility Amendment | Revolving Credit Facility Non-conforming Tranche
Summary Of Significant Accounting Policies [Line Items]
Line of credit facility maximum borrowing capacity								30,000,000		30,000,000
First Lien Facility Amendment | Scenario, Forecast
Summary Of Significant Accounting Policies [Line Items]
Lenders’ waivers description	The First Lien lenders’ waivers are subject to revocation in certain circumstances, including the exercise of remedies by junior lenders (including pursuant to our second lien credit facility), the failure to extend the standstill period under the intercreditor agreement at least 15 business days prior to its expiration, and the occurrence of additional events of default under the First Lien Facility.
First Lien Facility Amendment | Scenario, Forecast | Revolving Credit Facility Conforming Tranche
Summary Of Significant Accounting Policies [Line Items]
Line of credit facility maximum borrowing capacity														$ 190,000,000	$ 330,000,000
First Lien Facility Amendment | Scenario, Forecast | Revolving Credit Facility Non-conforming Tranche
Summary Of Significant Accounting Policies [Line Items]
Line of credit facility maximum borrowing capacity													$ 10,000,000
Revolving Credit Facility
Summary Of Significant Accounting Policies [Line Items]
Deferred financing costs, net of accumulated amortization								3,800,000		3,800,000	$ 19,800,000
Accumulated amortization								500,000		500,000	29,100,000
Amortization of financing costs								500,000			$ 13,600,000	$ 7,300,000
Revolving Credit Facility | Predecessor
Summary Of Significant Accounting Policies [Line Items]
Amortization of financing costs									$ 10,600,000
Credit Facilities
Summary Of Significant Accounting Policies [Line Items]
Outstanding indebtedness								694,800,000		694,800,000
Outstanding indebtedness based on potential occurrence								666,800,000		666,800,000
Deferred financing costs								2,000,000		2,000,000
Credit Facilities | Due on May 1, 2017
Summary Of Significant Accounting Policies [Line Items]
Outstanding indebtedness								$ 30,000,000		$ 30,000,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Pro-rata share in Drilling Partnerships										10.00%
Recognition period to receive fees										60 days
Amount of fixed fees received by each well drilled										$ 100,000
Monthly operating fee paid per well										$ 1,000
Return on unhedged revenue percentage										10.00%
Period of return on unhedged revenue										5 years
Minimum | Pipelines, processing and compression facilities
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life										15 years
Minimum | Buildings and land improvements
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life										3 years
Minimum | Other support equipment
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life										3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Pro-rata share in Drilling Partnerships										30.00%
Recognition period to receive fees										270 years
Amount of fixed fees received by each well drilled										$ 500,000
Monthly operating fee paid per well										$ 2,000
Percentage on unhedged revenue										50.00%
Return on unhedged revenue percentage										12.00%
Period of return on unhedged revenue										8 years
Maximum | Pipelines, processing and compression facilities
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life										20 years
Maximum | Buildings and land improvements
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life										40 years
Maximum | Other support equipment
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life										10 years
Maximum | First Lien Facility Amendment | Scenario, Forecast
Summary Of Significant Accounting Policies [Line Items]
Total Debt to EBITDA				550.00%	550.00%	550.00%	550.00%
Ratio of First Lien Debt to EBITDA				400.00%	400.00%	400.00%	400.00%
Maximum | First Lien Facility Amendment | After December 31, 2018 (Thereafter)
Summary Of Significant Accounting Policies [Line Items]
Total Debt to EBITDA										500.00%
Ratio of First Lien Debt to EBITDA										350.00%