HighPoint Resources (HPR) 10-Q 31 Oct 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 17, 2018
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	HPR
Entity Registrant Name	HighPoint Resources Corp
Entity Central Index Key	1,725,526
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		212,444,845

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 92,980	$ 314,466
Accounts receivable, net of allowance for doubtful accounts	68,035	51,415
Prepayments and other current assets	2,967	1,782
Total current assets	163,982	367,663
Property and equipment - at cost, successful efforts method for oil and gas properties:
Proved oil and gas properties	1,876,664	1,361,168
Unproved oil and gas properties, excluded from amortization	657,541	84,676
Furniture, equipment and other	18,515	17,899
Property, plant and equipment, gross	2,552,720	1,463,743
Accumulated depreciation, depletion, amortization and impairment	(578,851)	(444,863)
Total property and equipment, net	1,973,869	1,018,880
Deferred financing costs and other noncurrent assets	6,795	4,163
Total	2,144,646	1,390,706
Current liabilities:
Accounts payable and other accrued liabilities	147,590	84,055
Amounts payable to oil and gas property owners	55,097	16,594
Production taxes payable	46,697	26,876
Derivative liabilities	87,470	20,940
Current portion of long-term debt	1,978	469
Total current liabilities	338,832	148,934
Long-term debt, net of debt issuance costs	617,006	617,744
Asset retirement obligations	27,036	16,097
Deferred income taxes	137,111	0
Derivatives and other noncurrent liabilities	36,864	9,377
Commitments and contingencies (Note 12)
Stockholders' equity:
Common stock, $0.001 par value; authorized 400,000,000 and 300,000,000 shares at September 30, 2018 and December 31, 2017, respectively; 212,445,188 and 110,363,539 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively, with 2,917,648 and 1,394,868 shares subject to restrictions, respectively	210	109
Additional paid-in capital	1,769,852	1,279,507
Retained earnings (accumulated deficit)	(782,265)	(681,062)
Treasury stock, at cost: zero shares at September 30, 2018 and December 31, 2017	0	0
Total stockholders' equity	987,797	598,554
Total liabilities and stockholders' equity	$ 2,144,646	$ 1,390,706

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Common Stock, Shares Authorized	400,000,000	300,000,000
Common Stock, Shares, Issued	212,445,188	110,363,539
Common stock, shares outstanding (in shares)	212,445,188	110,363,539
Common stock, shares subject to restrictions (in shares)	2,917,648	1,394,868
Treasury stock, shares (in shares)	0	0

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Revenues:
Total operating revenues	$ 131,126	$ 67,865	$ 322,334	$ 169,467
Operating Expenses:
Production tax expense	11,504	5,384	26,363	9,140
Exploration expense	19	18	39	48
Impairment, dry hole costs and abandonment expense	184	261	609	8,336
(Gain) loss on sale of properties	74	0	1,046	(92)
Depreciation, depletion and amortization	58,946	41,732	152,106	119,409
Unused commitments	4,574	4,557	13,684	13,687
General and administrative expense	12,696	12,496	34,427	30,788
Merger transaction expense	100	0	6,140	0
Other operating expenses, net	(764)	(282)	(716)	(1,610)
Total operating expenses	95,968	70,705	257,609	198,637
Operating Income (Loss)	35,158	(2,840)	64,725	(29,170)
Other Income and Expense:
Interest and other income	451	332	1,843	1,030
Interest expense	(13,165)	(13,926)	(39,348)	(44,014)
Commodity derivative gain (loss)	(51,547)	(12,408)	(128,166)	19,654
Gain (loss) on extinguishment of debt	(257)	0	(257)	(7,904)
Total other income and expense	(64,518)	(26,002)	(165,928)	(31,234)
Income (Loss) before Income Taxes	(29,360)	(28,842)	(101,203)	(60,404)
(Provision for) Benefit from Income Taxes	0	0	0	0
Net Income (Loss)	$ (29,360)	$ (28,842)	$ (101,203)	$ (60,404)
Net Income (Loss) Per Common Share, Basic (in dollars per share)	$ (0.14)	$ (0.39)	$ (0.56)	$ (0.81)
Net Income (Loss) Per Common Share, Diluted (in dollars per share)	$ (0.14)	$ (0.39)	$ (0.56)	$ (0.81)
Weighted Average Common Shares Outstanding, Basic	209,501,887	74,886,107	181,144,822	74,742,699
Weighted Average Common Shares Outstanding, Diluted	209,501,887	74,886,107	181,144,822	74,742,699
Oil, gas and NGL production
Operating Revenues:
Production and other revenues	$ 131,585	$ 67,175	$ 322,534	$ 168,541
Other operating revenues, net
Operating Revenues:
Production and other revenues	(459)	690	(200)	926
Lease operating expense
Operating Expenses:
Cost of goods and services	7,237	5,919	21,082	17,287
Gathering, transportation and processing expense
Operating Expenses:
Cost of goods and services	$ 1,398	$ 620	$ 2,829	$ 1,644

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (29,360)	$ (28,842)	$ (101,203)	$ (60,404)	$ (138,225)
Other Comprehensive Income (Loss), net of tax:
Other comprehensive income (loss)	0	0	0	0
Comprehensive Income (Loss)	$ (29,360)	$ (28,842)	$ (101,203)	$ (60,404)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities:
Net Income (Loss)	$ (101,203)	$ (60,404)
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	152,106	119,409
Impairment, dry hole costs and abandonment expense	609	8,336
Commodity derivative (gain) loss	128,166	(19,654)
Settlements of commodity derivatives	(42,628)	17,062
Stock compensation and other non-cash charges	5,813	5,134
Amortization of deferred financing costs	1,729	1,665
(Gain) loss on extinguishment of debt	257	7,904
(Gain) loss on sale of properties	1,046	(92)
Change in operating assets and liabilities:
Accounts receivable	(8,789)	(9,252)
Prepayments and other assets	(1,421)	(980)
Accounts payable, accrued and other liabilities	(25,287)	20,071
Amounts payable to oil and gas property owners	33,804	6,371
Production taxes payable	15,983	(187)
Net cash provided by (used in) operating activities	160,185	95,383
Investing Activities:
Additions to oil and gas properties, including acquisitions	(322,614)	(160,788)
Additions of furniture, equipment and other	(616)	(268)
Repayment of debt associated with merger, net of cash acquired	(53,357)	0
Proceeds from sale of properties and other investing activities	11	(712)
Net cash provided by (used in) investing activities	(376,576)	(161,768)
Financing Activities:
Proceeds from debt	0	275,000
Principal payments on debt	(350)	(322,228)
Proceeds from sale of common stock, net of offering costs	1	(298)
Deferred financing costs and other	(4,746)	(6,045)
Net cash provided by (used in) financing activities	(5,095)	(53,571)
Increase (Decrease) in Cash and Cash Equivalents	(221,486)	(119,956)
Beginning Cash and Cash Equivalents	314,466	275,841
Ending Cash and Cash Equivalents	$ 92,980	$ 155,885

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change		$ (329)		$ 180	$ (509)
Balance at Dec. 31, 2016		571,543	$ 74	1,113,797	(542,328)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of options, restricted stock activity and shares exchanged for exercise and tax withholding		(1,252)	1			(1,253)
Stock-based compensation		7,099		7,099
Retirement of treasury stock		0		(1,253)		1,253
Exchange of senior notes for shares of common stock		48,992	11	48,981
Issuance of common stock, net of offering costs		110,726	23	110,703
Net income (loss)		(138,225)			(138,225)
Balance at Dec. 31, 2017		598,554	109	1,279,507	(681,062)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of options, restricted stock activity and shares exchanged for exercise and tax withholding		(1,532)	1			(1,533)
Stock-based compensation	[1]	7,978		7,978
Retirement of treasury stock		0		(1,533)		1,533
Issuance of common stock, merger		484,000	100	483,900
Net income (loss)		(101,203)			(101,203)
Balance at Sep. 30, 2018		$ 987,797	$ 210	$ 1,769,852	$ (782,265)	$ 0
[1]	As of September 30, 2018, includes the modification of the 2016 Program and 2017 Program from performance-based liability awards to service-based equity awards. See Note 11 for additional information.

Organization

Organization	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization HighPoint Resources Corporation, a Delaware corporation, together with its wholly-owned subsidiary (collectively, the "Company"), is an independent oil and gas company engaged in the exploration, development and production of oil, natural gas and natural gas liquids ("NGLs"). The Company became the successor to Bill Barrett Corporation ("Bill Barrett"), on March 19, 2018, upon closing of the transactions contemplated by the Agreement and Plan of Merger, dated December 4, 2017 (the "Merger Agreement"), pursuant to which Bill Barrett combined with Fifth Creek Energy Operating Company, LLC ("Fifth Creek") (the "Merger"). As a result of the Merger, Bill Barrett became a wholly-owned subsidiary of HighPoint Resources Corporation and subsequently Bill Barrett changed its name to HighPoint Operating Corporation. The Company currently conducts its activities principally in the Denver Julesburg Basin ("DJ Basin") in Colorado. Except where the context indicates otherwise, references herein to the "Company" with respect to periods prior to the completion of the Merger refer to Bill Barrett and its subsidiaries.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation. The accompanying Unaudited Consolidated Financial Statements include the accounts of the Company. These statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the accompanying consolidated financial statements include all adjustments (consisting of normal recurring accruals and adjustments) necessary to present fairly, in all material respects, the Company's interim results. However, operating results for the periods presented are not necessarily indicative of the results that may be expected for the full year. The Annual Report on Form 10-K filed by the Company's predecessor Bill Barrett for the year ended December 31, 2017 includes certain definitions and a summary of significant accounting policies and should be read in conjunction with this Quarterly Report on Form 10-Q. Except as disclosed herein, there have been no material changes to the information disclosed in the notes to the consolidated financial statements included in the Bill Barrett 2017 Annual Report on Form10-K. The results of operations attributable to the merged companies are included in the Unaudited Consolidated Statements of Operations beginning on March 19, 2018. Use of Estimates. In the course of preparing the Company's financial statements in accordance with GAAP, management makes various assumptions, judgments and estimates to determine the reported amount of assets, liabilities, revenues and expenses and in the disclosure of commitments and contingencies. Changes in these assumptions, judgments and estimates will occur as a result of the passage of time and the occurrence of future events and, accordingly, actual results could differ from amounts initially established. Areas requiring the use of assumptions, judgments and estimates relate to volumes of oil, natural gas and NGL reserves used in calculating depreciation, depletion and amortization ("DD&A"), the amount of expected future cash flows used in determining possible impairments of oil and gas properties and the amount of future capital costs used in these calculations. Assumptions, judgments and estimates also are required in determining the fair values of assets acquired and liabilities assumed in business combinations, asset retirement obligations, the timing of dry hole costs, impairments of proved and unproved oil and gas properties, valuing deferred tax assets and estimating fair values of derivative instruments and stock-based payment awards. Accounts Receivable. Accounts receivable is comprised of the following: As of September 30, 2018 As of December 31, 2017 (in thousands) Oil, gas and NGL sales $ 51,405 $ 36,569 Due from joint interest owners 16,607 14,779 Other 28 270 Allowance for doubtful accounts (5 ) (203 ) Total accounts receivable $ 68,035 $ 51,415 Oil and Gas Properties. The Company's oil, gas and NGL exploration and production activities are accounted for using the successful efforts method. Under this method, all property acquisition costs and costs of exploratory and development wells are capitalized when incurred, pending determination of whether the well has found proved reserves. If an exploratory well does not find proved reserves, the costs of drilling the well are charged to expense and remain within cash flows from investing activities in the Unaudited Consolidated Statements of Cash Flows. If an exploratory well does find proved reserves, the costs remain capitalized, are included within additions to oil and gas properties and remain within cash flows from investing activities in the Unaudited Consolidated Statements of Cash Flows. The costs of development wells are capitalized whether proved reserves are added or not. Oil and gas lease acquisition costs are also capitalized. Upon sale or retirement of depreciable or depletable property, the cost and related accumulated DD&A are eliminated from the accounts and the resulting gain or loss is recognized. Other exploration costs, including certain geological and geophysical expenses and delay rentals for oil and gas leases, are charged to expense as incurred. The sale of a partial interest in a proved property is accounted for as a cost recovery and no gain or loss is recognized as long as this treatment does not significantly affect the unit-of-production amortization rate. Maintenance and repairs are charged to expense, and renewals and betterments are capitalized to the appropriate property and equipment accounts. Unproved oil and gas property costs are transferred to proved oil and gas properties if the properties are subsequently determined to be productive or are assigned proved reserves. Proceeds from sales of partial interests in unproved leases are accounted for as a recovery of cost without recognizing any gain until all costs are recovered. Unproved oil and gas properties are assessed periodically for impairment based on remaining lease terms, drilling results, reservoir performance, commodity price outlooks, future plans to develop acreage, recent sales prices of comparable properties and other relevant matters. Materials and supplies consist primarily of tubular goods and well equipment to be used in future drilling operations or repair operations and are carried at the lower of cost or market value. The following table sets forth the net capitalized costs and associated accumulated DD&A and non-cash impairments relating to the Company's oil, natural gas and NGL producing activities: As of September 30, 2018 As of December 31, 2017 (in thousands) Proved properties $ 427,982 $ 230,800 Wells and related equipment and facilities 1,370,616 1,088,692 Support equipment and facilities 64,324 38,776 Materials and supplies 13,742 2,900 Total proved oil and gas properties $ 1,876,664 $ 1,361,168 Unproved properties 549,342 18,832 Wells and facilities in progress 108,199 65,844 Total unproved oil and gas properties, excluded from amortization $ 657,541 $ 84,676 Accumulated depreciation, depletion, amortization and impairment (567,156 ) (433,234 ) Total oil and gas properties, net (1) $ 1,967,049 $ 1,012,610 (1) Total oil and gas properties, net includes $722.0 million of properties acquired in the Merger. See Note 4 for additional information regarding the Merger. The Company reviews oil and natural gas properties for impairment on a quarterly basis or whenever events and circumstances indicate that a decline in the recoverability of their carrying value may have occurred. The Company estimates the expected undiscounted future net cash flows of its oil and gas properties using proved and risked probable and possible reserves based on the Company's development plans and best estimate of future production, commodity pricing, reserve risking, gathering and transportation deductions, production tax rates, lease operating expenses and future development costs. The Company compares such undiscounted future net cash flows to the carrying amount of the oil and gas properties to determine if the carrying amount is recoverable. If the undiscounted future net cash flows exceed the carrying amount of the oil and gas properties, no impairment is taken. If the carrying amount of a property exceeds the undiscounted future net cash flows, the Company will impair the carrying value to fair value based on an analysis of quantitative and qualitative factors existing as of the balance sheet date. The Company does not believe that the undiscounted future net cash flows of its oil and gas properties represent the applicable market value. The factors used to determine fair value may include, but are not limited to, recent sales prices of comparable properties, indications from marketing activities, the present value of future revenues, net of estimated operating and development costs using estimates of reserves, future commodity pricing, future production estimates, anticipated capital expenditures and various discount rates commensurate with the risk and current market conditions associated with realizing the projected cash flows. The Company recognized non-cash impairment charges, which were included within impairment, dry hole costs and abandonment expense in the Unaudited Consolidated Statements of Operations, as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Impairment of unproved oil and gas properties (1) $ — $ — $ — $ 8,010 Abandonment expense and lease expirations 184 261 609 326 Total impairment, dry hole costs and abandonment expense $ 184 $ 261 $ 609 $ 8,336 (1) The Company recognized impairment related to unproved oil and gas properties in the Cottonwood Gulch area of the Piceance Basin during the nine months ended September 30, 2017 . The Company had no current plan to develop this acreage. The provision for DD&A of oil and gas properties is calculated on a field-by-field basis based on geologic and reservoir delineation using the unit-of-production method. Natural gas and NGLs are converted to an oil equivalent, Boe, at the standard rate of six Mcf to one Boe and forty-two gallons to one Boe, respectively. Estimated future dismantlement, restoration and abandonment costs are taken into consideration by this calculation. Accounts Payable and Other Accrued Liabilities. Accounts payable and other accrued liabilities are comprised of the following: As of September 30, 2018 As of December 31, 2017 (in thousands) Accrued drilling, completion and facility costs (1) $ 97,634 $ 35,856 Accrued lease operating, gathering, transportation and processing expenses 7,104 4,360 Accrued general and administrative expenses 8,248 11,134 Accrued interest payable 18,355 6,484 Accrued merger transaction expenses 174 8,278 Accrued hedge settlements 6,411 65 Prepayments from partners 937 2,524 Trade payables 5,341 10,067 Other 3,386 5,287 Total accounts payable and other accrued liabilities $ 147,590 $ 84,055 (1) The increase as of September 30, 2018 is due to an increase in drilling and completions activity. Environmental Liabilities. Environmental expenditures that relate to an existing condition caused by past operations and that do not contribute to current or future revenue generation are expensed. Environmental liabilities are accrued when environmental assessments and/or clean-ups are probable, and the costs can be reasonably estimated. Recent case law in Wyoming has exposed the Company to obligations for plugging and abandoning wells, and associated reclamation, for assets that were sold to other industry parties in prior years that are now in default. Regulatory agencies and landowners have demanded that the Company perform such activities. Revenue Recognition. All of the Company's sales of oil, gas and NGLs are made under contracts with customers, whereby revenues are recognized when the Company satisfies its performance obligations and the customer obtains control of the product. Performance obligations under the Company's contracts with customers are typically satisfied at a point-in-time through monthly delivery of oil, gas and/or NGLs. Accordingly, at the end of the reporting period, the Company does not have any unsatisfied performance obligations. The Company's contracts with customers typically include variable consideration based on monthly pricing tied to local indices and volumes delivered in the current month. The nature of the Company's contracts with customers does not require the Company to constrain variable consideration for accounting purposes. As of September 30, 2018 , the Company had open contracts with customers with terms of 1 month to 19 years , as well as evergreen contracts that renew on a periodic basis if not canceled by the Company or the customer. The Company's contracts with customers typically require payment within one month of delivery. Under the Company's contracts with customers, natural gas and its components, including NGLs, are either sold to a midstream entity (which processes the natural gas and subsequently sells the resulting residue gas and NGLs) or are sold to a gas or NGL purchaser after being processed by a third party for a fee. Regardless of the contract structure type, the terms of these contracts compensate the Company for the value of the residue gas and NGLs at current market prices for each product. The Company's oil is sold to multiple oil purchasers at specific delivery points at or near the wellhead. All costs incurred to gather, transport and/or process the Company's oil, gas and NGLs after control has transferred to the customer are considered components of the consideration received from the customer and thus recorded in oil, gas and NGL production revenues in the Unaudited Consolidated Statements of Operations. All costs incurred prior to the transfer of control to the customer are included in gathering, transportation and processing expense in the Unaudited Consolidated Statements of Operations. Gas imbalances from the sale of natural gas are recorded on the basis of gas actually sold by the Company. If the Company's aggregate sales volumes for a well are greater (or less) than its proportionate share of production from the well, a liability (or receivable) is established to the extent there are insufficient proved reserves available to make-up the overproduced (or underproduced) imbalance. Imbalances have not been significant in the periods presented. Derivative Instruments and Hedging Activities. The Company periodically uses derivative financial instruments to achieve a more predictable cash flow from its oil, natural gas and NGL sales by reducing its exposure to price fluctuations. Derivative instruments are recorded at fair market value and are included in the Unaudited Consolidated Balance Sheets as assets or liabilities. Income Taxes. Income taxes are provided for the tax effects of transactions reported in the financial statements and consist of taxes currently payable plus deferred income taxes related to certain income and expenses recognized in different periods for financial and income tax reporting purposes. Deferred income tax assets and liabilities represent the future tax return consequences of those differences, which will either be taxable or deductible when assets are recovered or liabilities are settled. Deferred income taxes also include tax credits and net operating losses that are available to offset future income taxes. Deferred income taxes are measured by applying currently enacted tax rates. Deferred tax assets are regularly reviewed, considering all positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, planning strategies and results of recent operations. The assumptions about future taxable income require significant judgment to determine whether it is more likely than not that the deferred tax asset will be realized. Changes to the Company's development plans, increases in market prices for hydrocarbons, improvements in our operating results, or other factors, could result in a release of some or all of the valuation allowance in a future period which would result in the recognition of a tax benefit. The Company accounts for uncertainty in income taxes for tax positions taken or expected to be taken in a tax return. Only tax positions that meet the more-likely-than-not recognition threshold are recognized. The Company does not have any uncertain tax positions recorded as of September 30, 2018 . Earnings/Loss Per Share. Basic net income (loss) per common share is calculated by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding during each period. Diluted net income (loss) per common share is calculated by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding and other dilutive securities. Potentially dilutive securities for the diluted net income per common share calculations consist of nonvested shares of common stock and outstanding in-the-money stock options to purchase the Company's common stock. As the Company was in a net loss position, all potentially dilutive securities were anti-dilutive for the three and nine months ended September 30, 2018 and 2017 . The following table sets forth the calculation of basic and diluted income (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands, except per share amounts) Net income (loss) $ (29,360 ) $ (28,842 ) $ (101,203 ) $ (60,404 ) Basic weighted-average common shares outstanding in period 209,502 74,886 181,145 74,743 Diluted weighted-average common shares outstanding in period 209,502 74,886 181,145 74,743 Basic net income (loss) per common share $ (0.14 ) $ (0.39 ) $ (0.56 ) $ (0.81 ) Diluted net income (loss) per common share $ (0.14 ) $ (0.39 ) $ (0.56 ) $ (0.81 ) New Accounting Pronouncements. In August 2018, the Securities and Exchange Commission, ("SEC") issued a final rule, Disclosure Update and Simplification , that updates and simplifies SEC disclosure requirements. The primary changes include removing the requirement to disclose outside of the consolidated financial statements historical and pro forma ratios of earnings to fixed charges and historical low and high trading prices and adding a requirement to provide within the interim financial statements an analysis of changes in stockholders' equity for the current and comparative quarterly and year-to-date periods. Other changes included requirements related to segment, geographic area and dividend disclosures. The final rule will be effective November 5, 2018 and will not have a material impact on the Company's disclosures. In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-13, Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement . The objective of this update is to improve the effectiveness of fair value measurement disclosures. ASU 2018-13 is effective for annual periods beginning after December 15, 2019, and interim periods within those annual periods. The standard will only impact the Company's disclosures. In June 2018, the FASB issued ASU 2018-07, Stock Compensation-Improvements to Non-employee Share-Based Payment Accounting . The objective of this update is to simplify several aspects of the accounting for non-employee share-based payment transactions resulting from expanding the scope of Topic 718, Compensation- Stock Compensation , to include share-based payment transactions for acquiring goods and services from non-employees. ASU 2018-07 is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods. The standard will not have a material impact on the Company's disclosures and financial statements. In May 2017, the FASB issued ASU 2017-09, Stock Compensation-Scope of Modification Accounting . The objective of this update is to provide clarity and reduce both diversity in practice and cost and complexity when applying a change to the terms or conditions of a share-based payment award. ASU 2017-09 was effective for annual periods beginning after December 15, 2017, and interim periods within those annual periods. The standard was adopted on January 1, 2018 and did not have a material impact on the Company's disclosures and financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations: Clarifying the definition of a business . The objective of this update is to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 was effective for annual and interim periods beginning after December 15, 2017. The standard was adopted prospectively on January 1, 2018 and did not have a material impact on the Company's disclosures and financial statements. The accounting treatment of the Merger was not affected by this guidance. See Note 4 for additional information regarding the Merger. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows-Classification of Certain Cash Receipts and Cash Payments . The objective of this update is to address eight specific cash flow issues in order to reduce the existing diversity in practice. ASU 2016-15 was effective for the annual periods beginning after December 15, 2017, and interim periods within those annual periods. The standard was adopted on January 1, 2018 and did not have a material impact on the Company's disclosures and financial statements. In February 2016, the FASB issued ASU 2016-02, Leases, followed by additional accounting standards updates that provided additional practical expedients and policy election options (collectively, Accounting Standards Codification Topic 842, ("ASC 842")). The objective of ASC 842 is to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASC 842 is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods. The Company intends to adopt ASC 842 using the modified retrospective method and to use the option to not apply ASC 842 to comparative periods. The Company has also elected the following practical expedients: • not to recognize lease assets or liabilities on the balance sheet when lease terms are less than twelve months, • carryforward previous conclusions related to current lease classification under the current lease accounting standard to lease classification for these existing leases under ASC 842, and • exclude from evaluation under ASC 842 land easements that existed or expired before adoption of ASC 842. The Company has compiled and analyzed its contracts and has identified which leasing arrangements will be affected. However, the Company is still evaluating the full impact of adopting this standard. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. The objective of this update is to clarify the principles for recognizing revenue and to develop a common revenue standard. The FASB subsequently issued ASU 2015-14, ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20, which provided additional implementation guidance and deferred the effective date of ASU 2014-09. The standard was effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. The standard was adopted on January 1, 2018 using the modified retrospective transition method, which was applied to contracts in place at the date of adoption. The adoption required the Company to net some additional gathering, transportation and processing expenses against its oil, gas and NGL production revenues. However, the cash flow and timing of the Company's revenue was not impacted and therefore no impact on the Company's net income (loss) or net income (loss) per common share. The standard also required additional footnote disclosures. See the " Revenue Recognition" section above for additional disclosures.

Supplemental Disclosures of Cas

Supplemental Disclosures of Cash Flow Information	9 Months Ended
	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures of Cash Flow Information	Supplemental Disclosures of Cash Flow Information Supplemental cash flow information is as follows: Nine Months Ended September 30, 2018 2017 (in thousands) Cash paid for interest $ 25,746 $ 31,113 Cash paid for income taxes — — Supplemental disclosures of non-cash investing and financing activities: Accrued liabilities - oil and gas properties 101,838 37,319 Accrued liabilities - financing costs 215 — Change in asset retirement obligations, net of disposals 9,885 10,453 Retirement of treasury stock (1,533 ) (1,246 ) Properties exchanged in non-cash transactions — 13,323 Issuance of common stock for Merger 484,000 —

Mergers

Mergers	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Mergers	Mergers Merger with Fifth Creek Operating Company, LLC On March 19, 2018, the Company completed the Merger with Fifth Creek. Assets acquired include approximately 81,000 net acres in Weld County in the DJ Basin, substantially all of which are operated, and 62 producing standard-length lateral wells and 10 producing extended-reach lateral wells. In addition, the Company recorded net proved reserves of 9.3 MMBoe, of which 4.7 MMBoe were proved developed reserves and 4.6 MMBoe were proved undeveloped reserves. The Merger was effected through the issuance of 100,000,000 shares of the Company's common stock, with a fair value of $484.0 million on the date of closing, and the repayment of $53.9 million of Fifth Creek debt. In connection with the Merger, the Company incurred costs of approximately $14.9 million to date of severance, consulting, advisory, legal and other merger-related fees, of which $6.1 million was included in the Company's Unaudited Consolidated Statement of Operations for the nine months ended September 30, 2018 , with the remainder incurred in 2017. Purchase Price Allocation The transaction was accounted for as a business combination, using the acquisition method, with the Company being the acquirer for accounting purposes. The following table represents the preliminary allocation of the total purchase price to the identifiable assets acquired and the liabilities assumed based on the estimated fair values at the acquisition date. The Company expects to complete the purchase price allocation during the 12-month period following the acquisition date, during which time the value of the assets and liabilities may be revised as appropriate. The following table sets forth the Company's preliminary purchase price allocation: March 19, 2018 (in thousands) Purchase Price: Fair value of common stock issued $ 484,000 Plus: Repayment of Fifth Creek debt 53,900 Total purchase price 537,900 Plus Liabilities Assumed: Accounts payable and accrued liabilities 25,782 Current unfavorable contract 2,651 Other current liabilities 13,797 Asset retirement obligations 7,361 Long-term deferred tax liability 137,111 Long-term unfavorable contract 4,449 Other noncurrent liabilities 2,354 Total purchase price plus liabilities assumed $ 731,405 Fair Value of Assets Acquired: Cash 543 Accounts receivable 7,831 Oil and Gas Properties: Proved oil and gas properties 105,702 Unproved oil and gas properties 608,972 Asset Retirement Obligations 7,361 Furniture, equipment and other 931 Other noncurrent assets 65 Total asset value $ 731,405 The fair value measurements of oil and natural gas properties and asset retirement obligations are based on inputs that are not observable in the market and therefore represent Level 3 inputs. The fair values of proved oil and natural gas properties and asset retirement obligations were measured using valuation techniques that convert future cash flows to a single discounted amount. Significant inputs to the valuation of oil and natural gas properties included estimates of: (i) recoverable reserves; (ii) production rates; (iii) future operating and development costs; (iv) future commodity prices; and (v) a market-based weighted average cost of capital rate. The fair value of unproved properties was determined using a market approach utilizing recent transactions of a similar nature in the same basin. These inputs required significant judgments and estimates by management at the time of the valuation and are the most sensitive to possible future changes. The results of operations attributable to the merged companies are included in the Unaudited Consolidated Statements of Operations beginning on March 19, 2018. The Company generated revenues of approximately $20.9 million and $35.2 million from the Fifth Creek assets during the three and nine months ended September 30, 2018 , respectively, and expenses of approximately $13.7 million and $25.1 million during the three and nine months ended September 30, 2018 , respectively. Pro Forma Financial Information The following pro forma condensed combined financial information was derived from the historical financial statements of the Company and Fifth Creek and gives effect to the acquisition as if it had occurred on January 1, 2017. The below information reflects pro forma adjustments based on available information and certain assumptions that the Company believes are reasonable, including (i) the repayment of Fifth Creek's debt, (ii) depletion of Fifth Creek's fair-valued proved crude oil and natural gas properties, and (iii) the estimated tax impacts of the pro forma adjustments. Additionally, pro forma earnings for the three and nine months ended September 30, 2018 were adjusted to exclude merger-related costs of $0.1 million and $6.1 million , respectively, incurred by the Company and zero and $4.0 million , respectively, incurred by Fifth Creek. The pro forma results of operations do not include any cost savings or other synergies that may result from the acquisition or any estimated costs that have been or will be incurred by the Company to integrate the Fifth Creek assets. The pro forma condensed combined financial information has been included for comparative purposes and is not necessarily indicative of the results that might have actually occurred had the acquisition taken place on January 1, 2017; furthermore, the financial information is not intended to be a projection of future results. Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands, except per share data) Revenues $ 131,126 $ 80,973 $ 338,266 $ 195,727 Net Income (Loss) and Comprehensive Income (Loss) (29,260 ) (33,301 ) (98,993 ) (65,180 ) Net Income (Loss) per Common Share, Basic and Diluted (0.14 ) (0.19 ) (0.47 ) (0.37 )

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The Company's outstanding debt is summarized below: As of September 30, 2018 As of December 31, 2017 Maturity Date Principal Debt Issuance Costs Carrying Amount Principal Debt Issuance Costs Carrying Amount (in thousands) Amended Credit Facility September 14, 2023 $ — $ — $ — $ — $ — $ — 7.0% Senior Notes (1) October 15, 2022 350,000 (3,419 ) 346,581 350,000 (4,033 ) 345,967 8.75% Senior Notes (2) June 15, 2025 275,000 (4,575 ) 270,425 275,000 (5,080 ) 269,920 Lease Financing Obligation (3) August 10, 2020 1,978 — 1,978 2,328 (2 ) 2,326 Total Debt $ 626,978 $ (7,994 ) $ 618,984 $ 627,328 $ (9,115 ) $ 618,213 Less: Current Portion of Long-Term Debt (4) 1,978 — 1,978 469 — 469 Total Long-Term Debt $ 625,000 $ (7,994 ) $ 617,006 $ 626,859 $ (9,115 ) $ 617,744 (1) The aggregate estimated fair value of the 7.0% Senior Notes was approximately $348.6 million and $356.1 million as of September 30, 2018 and December 31, 2017 , respectively, based on reported market trades of these instruments. (2) The aggregate estimated fair value of the 8.75% Senior Notes was approximately $290.2 million and $305.3 million as of September 30, 2018 and December 31, 2017 , respectively, based on reported market trades of these instruments. (3) The aggregate estimated fair value of the Lease Financing Obligation was approximately $1.8 million and $2.1 million as of September 30, 2018 and December 31, 2017 , respectively. As there is no active, public market for the Lease Financing Obligation, the aggregate estimated fair value was based on market-based parameters of comparable term secured financing instruments. (4) The current portion of long-term debt includes the current portion of the Lease Financing Obligation. The Company has elected to exercise the early buyout option pursuant to which the Company will purchase the equipment for $1.8 million on February 10, 2019. Amended Credit Facility The Company entered into a fourth amended and restated credit facility (the "Amended Credit Facility"), which extends the maturity date to September 14, 2023 , and provides for a maximum credit amount of $1.5 billion , an initial elected commitment amount of $500.0 million and an initial borrowing base of $500.0 million . Due to the amendment, the Company recognized a loss on extinguishment of debt of $0.3 million on the Unaudited Consolidated Statement of Operations for the three and nine months ended September 30, 2018 . As credit support for future payments under a contractual obligation, a $26.0 million letter of credit has been issued under the Amended Credit Facility, which reduced the available borrowing capacity under the Amended Credit Facility as of September 30, 2018 to $474.0 million . There have been no borrowings under the Amended Credit Facility (or, as applicable, the facility then in place) to date in 2018 and there were no such borrowings in 2017. Interest rates are either adjusted LIBOR plus applicable margins of 1.5% to 2.5% or an alternate base rate plus applicable margins of 0.5% to 1.5% , and the unused commitment fee is between 0.375% and 0.5% . The applicable margin and the unused commitment fee rate are determined based on borrowing base utilization. The borrowing base under the Amended Credit Facility is determined at the discretion of the lenders, based on the collateral value of the Company's proved reserves that have been mortgaged to the lenders, and is subject to regular re-determination on or about April 1 and October 1 of each year, as well as following certain property sales. Borrowing bases are computed based on proved oil, natural gas and NGL reserves, hedge positions and estimated future cash flows from the reserves calculated using future commodity pricing provided by the Company's lenders, as well as any other outstanding debt. Lower commodity prices could result in a decreased borrowing base. The Amended Credit Facility contains certain financial covenants. The Company is currently in compliance with all financial covenants and has complied with all financial covenants since issuance. If the Company fails to comply with the covenants or other terms of any agreements governing the Company's debt, the lenders under the Amended Credit Facility and holders of the Company's senior notes may have the right to accelerate the maturity of the relevant debt and foreclose upon the collateral, if any, securing that debt. The occurrence of any such event would adversely affect the Company's financial condition. 7.0% Senior Notes Due 2022 The Company's $350.0 million aggregate principal amount 7.0% Senior Notes mature on October 15, 2022 at par, unless earlier redeemed or purchased by the Company. Interest is payable in arrears semi-annually on April 15 and October 15 of each year. The 7.0% Senior Notes are senior unsecured obligations and rank equal in right of payment with all of the Company's other existing and future senior unsecured indebtedness, including the 8.75% Senior Notes. The 7.0% Senior Notes are redeemable at the Company's option at redemption prices of 102.333% , 101.167% and 100.000% of the principal amount on or after October 15, 2018, 2019 and 2020, respectively. 8.75% Senior Notes Due 2025 The Company's $275.0 million aggregate principal amount 8.75% Senior Notes mature on June 15, 2025 at par, unless earlier redeemed or purchased by the Company. Interest is payable in arrears semi-annually on June 15 and December 15 of each year. The 8.75% Senior Notes are senior unsecured obligations and rank equal in right of payment with all of the Company's other existing and future senior unsecured indebtedness, including the 7.0% Senior Notes. The 8.75% Senior Notes will become redeemable at the Company's option on or after June 15, 2020, 2021, 2022 and 2023 at redemption prices of 106.563% , 104.375% , 102.188% and 100.000% of the principal amount, respectively. Prior to June 15, 2020, the Company may use proceeds of an equity offering to redeem up to 35% of the principal amount at a redemption price of 108.750% of the principal amount. In addition, prior to June 15, 2020, the Company may redeem the notes at a redemption price equal to 100.000% of the principal amount plus a specified "make-whole" premium. The issuer of the 7.0% Senior Notes and the 8.75% Senior Notes is HighPoint Operating Corporation (f/k/a Bill Barrett). Pursuant to supplemental indentures entered into in connection with the Merger, HighPoint Resources Corporation became a guarantor of the 7.0% Senior Notes and the 8.75% Senior Notes in March 2018. All covenants in the indentures governing the notes limit the activities of HighPoint Operating Corporation, including limitations on the ability to pay dividends, incur additional indebtedness, make restricted payments, create liens, sell assets or make loans to HighPoint Resources Corporation, but in most cases the covenants in the indentures are not applicable to HighPoint Resources Corporation. HighPoint Operating Corporation is currently in compliance with all covenants and has complied with all covenants since issuance. Nothing in the indentures governing the 7.0% Senior Notes or the 8.75% Senior Notes prohibits the Company from repurchasing any of the notes from time to time at any price in open market purchases, negotiated transactions or by tender offer or otherwise without any notice to or consent of the holders. Lease Financing Obligation Due 2020 The Company has a lease financing obligation with a balance of $2.0 million as of September 30, 2018 resulting from the Company's sale and subsequent lease back of certain compressors and related facilities owned by the Company (the "Lease Financing Obligation"). The Lease Financing Obligation expires on August 10, 2020 , and the Company has the option to purchase the equipment at the end of the lease term for the then current fair market value. The Lease Financing Obligation also contains an early buyout option pursuant to which the Company will purchase the equipment for $1.8 million on February 10, 2019. The lease payments related to the equipment are recognized as principal and interest expense based on a weighted average implicit interest rate of 3.3% . See Note 12 for a discussion of aggregate minimum future lease payments.

Asset Retirement Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations A reconciliation of the Company's asset retirement obligations for the nine months ended September 30, 2018 is as follows (in thousands): As of December 31, 2017 $ 17,586 Liabilities incurred (1) 9,818 Liabilities settled (1,429 ) Disposition of properties (351 ) Accretion expense 922 Revisions to estimate 1,847 As of September 30, 2018 $ 28,393 Less: Current asset retirement obligations 1,357 Long-term asset retirement obligations $ 27,036 (1) Includes $7.4 million associated with properties acquired in the Merger during the nine months ended September 30, 2018 . See Note 4 for additional information regarding this Merger.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The Company uses market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk. These inputs can be readily observable, market corroborated or generally unobservable. A fair value hierarchy was established that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Level 1 – Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 – Quoted prices are available in active markets for similar assets or liabilities and in non-active markets for identical or similar instruments. Model-derived valuations have inputs that are observable or whose significant value drivers are observable. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. Level 3 – Pricing inputs include significant inputs that are generally less observable than objective sources. These inputs may be used with internally developed methodologies that result in management's best estimate of fair value. At each balance sheet date, the Company performs an analysis of all applicable instruments and includes in Level 3 all of those whose fair value is based on significant unobservable inputs. Assets and Liabilities Measured at Fair Value on a Recurring Basis Certain assets and liabilities are measured at fair value on a recurring basis in the Company's consolidated balance sheet. The following methods and assumptions were used to estimate the fair values: Cash equivalents – The highly liquid cash equivalents are recorded at fair value. Carrying value approximates fair value, which represents a Level 1 input. Deferred compensation plan – The Company maintains a non-qualified deferred compensation plan which allows certain management employees to defer receipt of a portion of their compensation. The Company maintains assets for the deferred compensation plan in a rabbi trust. The assets of the rabbi trust are invested in publicly traded mutual funds and are recorded in other current and other long-term assets in the Unaudited Consolidated Balance Sheets. The deferred compensation plan financial assets are reported at fair value based on active market quotes, which represent Level 1 inputs. Commodity derivatives – The fair value of crude oil, natural gas and NGL swaps and costless collars are valued based on an income approach using various assumptions, such as quoted forward prices for commodities, risk-free discount rates, volatility factors and time value factors. These assumptions are observable in the marketplace throughout the full term of the contract, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace, and are, therefore, designated as Level 2 inputs. The Company utilizes its counterparties' valuations to assess the reasonableness of its own valuations. The commodity derivatives have been adjusted for non-performance risk. For applicable financial assets carried at fair value, the credit standing of the counterparties is analyzed and factored into the fair value measurement of those assets. In addition, the fair value measurement of a liability has been adjusted to reflect the nonperformance risk of the Company. The following tables set forth by level within the fair value hierarchy the Company's non-financial assets and liabilities that were measured at fair value on a recurring basis in the Unaudited Consolidated Balance Sheets. Level 1 Level 2 Level 3 Total (in thousands) As of September 30, 2018 Financial Assets Cash equivalents $ 63,189 $ — $ — $ 63,189 Deferred compensation plan 1,516 — — 1,516 Commodity derivatives — 1,222 — 1,222 Financial Liabilities Commodity derivatives — 119,242 — 119,242 As of December 31, 2017 Financial Assets Cash equivalents 271,027 — — 271,027 Deferred compensation plan 1,749 — — 1,749 Commodity derivatives — 656 — 656 Financial Liabilities Commodity derivatives — 25,714 — 25,714 Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Certain assets and liabilities are measured at fair value on a nonrecurring basis in the Company's consolidated balance sheets. The following methods and assumptions were used to estimate the fair values: Oil and gas properties – Oil and gas property costs are evaluated for impairment when there is an indication that the carrying costs may not be recoverable. If an impairment is necessary, the fair value is estimated by using either a market approach based on recent sales prices of comparable properties and/or indications from marketing activities or by using the income valuation technique, which involves calculating the present value of future net revenues. The present value, net of estimated operating and development costs, is calculated using estimates of reserves, future commodity pricing, future production estimates, anticipated capital expenditures and various discount rates commensurate with the risk and current market conditions associated with realizing the projected cash flows, predominantly all of which are designated as Level 3 inputs within the fair value hierarchy. Information about impaired assets is as follows: Level 1 Level 2 Level 3 Net Book (1) Impairment (in thousands) As of September 30, 2018 Oil and gas properties $ — $ — $ — $ — $ — As of December 31, 2017 Uinta Basin oil and gas properties (2) — — 106,587 144,532 37,945 DJ Basin unproved properties (3) — — 18,832 20,887 2,055 Piceance Basin unproved properties (4) — — — 9,098 9,098 (1) Amount represents net book value at the date of assessment. (2) The Company recognized a non-cash impairment charge of $37.9 million associated with the Company's Uinta Oil Program proved properties during the year ended December 31, 2017. The properties were sold on December 29, 2017. (3) As a result of having no future plans to develop certain acreage and/or estimated market values below carrying value, the Company recognized non-cash impairment charges of $2.1 million associated with certain non-core unproved properties in the DJ Basin during the year ended December 31, 2017 . (4) As a result of having no future plans to develop certain acreage and/or estimated market values below carrying value, the Company recognized non-cash impairment charges of $9.1 million associated with certain unproved properties in the Cottonwood Gulch area of the Piceance Basin during the year ended December 31, 2017 . Purchase price allocation – The Merger was accounted for as a business combination, using the acquisition method. The allocation of the total purchase price to the identifiable assets acquired and the liabilities assumed was based on the fair values at the acquisition date. See Note 4 for additional information regarding the fair value of the Merger. Additional Fair Value Disclosures Long-term Debt – Long-term debt is not presented at fair value on the Unaudited Consolidated Balance Sheets, as it is recorded at carrying value, net of unamortized debt issuance costs. The fair values of the Company's fixed rate 7.0% Senior Notes and 8.75% Senior Notes totaled $638.8 million and $661.4 million as of September 30, 2018 and December 31, 2017 , respectively. The fair values of the Company's fixed rate Senior Notes are based on active market quotes, which represent Level 1 inputs. There is no active, public market for the Amended Credit Facility or Lease Financing Obligation. The recorded value of the Amended Credit Facility approximates its fair value due to its floating rate structure based on the LIBOR spread, secured interest, and the Company's borrowing base utilization. The Amended Credit Facility had a balance of zero as of September 30, 2018 and December 31, 2017 . The Lease Financing Obligation fair values of $1.8 million and $2.1 million as of September 30, 2018 and December 31, 2017 , respectively, are measured based on market-based parameters of comparable term secured financing instruments. The fair value measurements for the Amended Credit Facility and Lease Financing Obligation represent Level 2 inputs.

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The Company uses financial derivative instruments as part of its price risk management program to achieve a more predictable cash flow from its production revenues by reducing its exposure to commodity price fluctuations. The Company has entered into financial commodity swap contracts and costless collars related to the sale of a portion of the Company's production. The Company does not enter into derivative instruments for speculative or trading purposes. In addition to financial contracts, the Company may at times be party to various physical commodity contracts for the sale of oil, natural gas and NGLs that have varying terms and pricing provisions. These physical commodity contracts qualify for the normal purchase and normal sale exception and, therefore, are not subject to hedge or mark-to-market accounting. The financial impact of physical commodity contracts is included in oil, natural gas and NGL production revenues at the time of settlement. All derivative instruments, other than those that meet the normal purchase and normal sale exception, as mentioned above, are recorded at fair value and included on the Unaudited Consolidated Balance Sheets as assets or liabilities. The following table summarizes the location, as well as the gross and net fair value amounts, of all derivative instruments presented on the Unaudited Consolidated Balance Sheets as of the dates indicated. As of September 30, 2018 Balance Sheet Gross Amounts of Gross Amounts Net Amounts of (in thousands) Derivative assets $ 642 $ (642 ) (1) $ — Deferred financing costs and other noncurrent assets 580 (580 ) (1) — Total derivative assets $ 1,222 $ (1,222 ) $ — Gross Amounts of Gross Amounts Net Amounts of (in thousands) Derivative liabilities $ (88,112 ) $ 642 (1) $ (87,470 ) Derivatives and other noncurrent liabilities (31,130 ) 580 (1) (30,550 ) Total derivative liabilities $ (119,242 ) $ 1,222 $ (118,020 ) As of December 31, 2017 Balance Sheet Gross Amounts of Gross Amounts Net Amounts of (in thousands) Derivative assets $ 594 $ (594 ) (1) $ — Deferred financing costs and other noncurrent assets 62 (62 ) (1) — Total derivative assets $ 656 $ (656 ) $ — Gross Amounts of Gross Amounts Net Amounts of (in thousands) Derivative liabilities $ (21,534 ) $ 594 (1) $ (20,940 ) Derivatives and other noncurrent liabilities (4,180 ) 62 (1) (4,118 ) Total derivative liabilities $ (25,714 ) $ 656 $ (25,058 ) (1) Asset and liability balances with the same counterparty are presented as a net asset or liability on the Unaudited Consolidated Balance Sheets. As of September 30, 2018 , the Company had swap contracts in place to hedge the following volumes for the periods indicated: October – December 2018 For the year 2019 For the year 2020 Derivative Weighted Average Price Derivative Volumes Weighted Average Price Derivative Volumes Weighted Average Price Oil (Bbls) 1,270,140 $ 54.63 6,704,184 $ 58.85 2,286,000 $ 61.32 Natural Gas (MMbtu) 460,000 $ 2.68 1,825,000 $ 2.05 — $ — As of September 30, 2018 , the Company had cashless collars (purchased put options and written call options) in place to hedge the following volumes for the periods indicated: October – December 2018 For the year 2019 Derivative Weighted Average Floor Price Weighted Average Ceiling Price Derivative Weighted Average Floor Price Weighted Average Ceiling Price Oil (Bbls) 184,000 $ 60.00 $ 77.27 552,000 $ 55.00 $ 77.56 The Company's derivative financial instruments are generally executed with major financial or commodities trading institutions. The instruments expose the Company to market and credit risks and may, at times, be concentrated with certain counterparties or groups of counterparties. The Company had derivatives in place with eight different counterparties as of September 30, 2018 . Although notional amounts are used to express the volume of these contracts, the amounts potentially subject to credit risk in the event of non-performance by the counterparties are substantially smaller. The creditworthiness of counterparties is subject to continual review by management, and the Company believes all of these institutions currently are acceptable credit risks. Full performance is anticipated, and the Company has no past due receivables from any of these counterparties. It is the Company's policy to enter into derivative contracts with counterparties that are lenders in the Amended Credit Facility, affiliates of lenders in the Amended Credit Facility or potential lenders in the Amended Credit Facility. The Company's derivative contracts are documented using an industry standard contract known as a Schedule to the Master Agreement and International Swaps and Derivative Association, Inc. ("ISDA") Master Agreement or other contracts. Typical terms for these contracts include credit support requirements, cross default provisions, termination events and set-off provisions. The Company is not required to provide any credit support to its counterparties other than cross collateralization with the properties securing the Amended Credit Facility. The Company has set-off provisions in its derivative contracts with lenders under its Amended Credit Facility which, in the event of a counterparty default, allow the Company to set-off amounts owed to the defaulting counterparty under the Amended Credit Facility or other obligations against monies owed to the Company under derivative contracts. Where the counterparty is not a lender under the Company's Amended Credit Facility, the Company may not be able to set-off amounts owed by the Company under the Amended Credit Facility, even if such counterparty is an affiliate of a lender under such facility. The Company does not have any derivative balances that are offset by cash collateral.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On the date of the Merger, the Fifth Creek assets were acquired in a nontaxable transaction pursuant to Section 351 of the Internal Revenue Code. Accordingly, a deferred tax liability of $137.1 million was recorded to reflect the difference between the fair value recorded and the tax basis of the assets acquired and liabilities assumed. The tax effects of temporary differences that give rise to significant components of the deferred tax assets and deferred tax liabilities as of September 30, 2018 and December 31, 2017 are presented below: As of September 30, 2018 As of December 31, 2017 (in thousands) Deferred tax assets: Net operating loss carryforward $ 115,423 $ 170,536 Stock-based compensation 3,507 3,826 Deferred rent 101 163 Deferred compensation 988 1,824 State tax credit carryforwards — 6,499 Financing obligation 620 705 Accrued expenses 583 248 Investment in partnership 1,255 — Derivative instruments 29,075 6,158 Other assets 2,276 228 Less: Valuation allowance (69,980 ) (114,530 ) Total deferred tax assets 83,848 75,657 Deferred tax liabilities: Oil and gas properties (220,759 ) (75,409 ) Prepaid expenses (200 ) (248 ) Total deferred tax assets (liabilities) (220,959 ) (75,657 ) Net deferred tax assets (liabilities) $ (137,111 ) $ — In connection with the Merger, the Company had a greater than 50% ownership change pursuant to Section 382 of the Internal Revenue Code. As a result of the ownership change, the Company's ability to use pre-change net operating losses ("NOLs") and credits against post-change taxable income is limited to an annual amount plus any built-in gains recognized within five years of the ownership change. The Company's annual limitation amount is approximately $11.7 million . The Company has reduced its federal and state NOLs by $274.6 million and $10.0 million , respectively, and eliminated its state tax credits by $8.2 million to reflect the expected impact of the Section 382 limitation. Deferred tax assets and the corresponding valuation allowance have been reduced by $64.5 million for the expected tax effect of the Section 382 limitation. As of September 30, 2018 , the Company projected approximately $468.0 million and $468.4 million of federal and state NOLs, respectively. The federal NOLs begin to expire in 2025 and the state NOLs begin to expire in 2029. On December 22, 2017, the Tax Cut and Jobs Act of 2017 ("TCJA") became law. The TCJA includes significant changes to the U.S. corporate tax system, including a rate reduction from 35% to 21% beginning in January 2018. Accordingly, the 21% federal tax rate is utilized in computing the Company's annualized effective tax rate. Other provisions of TCJA include the elimination of the corporate alternative minimum tax, acceleration of depreciation for U.S. tax purposes, limitations on deductibility of interest expense, expanded Section 162(m) limitations on the deductibility of officers' compensation, the elimination of NOL carrybacks, and indefinite carryforwards on losses generated after 2017, subject to restrictions on their utilization. In assessing the Company's ability to realize the benefit of the deferred tax assets, management must consider whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. Management considers all available evidence (both positive and negative) in determining whether a valuation allowance is required. Such evidence includes the scheduled reversal of deferred tax liabilities and projected future taxable income and tax planning strategies, and judgment is required in considering the relative weight of negative and positive evidence. In regard to the Company's deferred tax assets, the Company considered all available evidence in assessing the need for a valuation allowance.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Common and Preferred Stock. The Company's authorized capital structure consists of 75,000,000 shares of preferred stock, par value, $0.001 per share, and 400,000,000 shares of common stock, par value $0.001 per share. In March 2018, the Company adopted an amended and restated Certificate of Incorporation which increased the number of authorized shares of common stock from 300,000,000 to 400,000,000 . There are no issued and outstanding shares of preferred stock. In March 2018, the Company completed the Merger with Fifth Creek. Pursuant to the Merger Agreement, each share of Bill Barrett common stock, par value $0.001 per share (the "BBG Common Stock"), issued and outstanding immediately prior to the closing of the Merger was converted into one share of the Company's common stock and all outstanding equity interests in Fifth Creek, in the aggregate, were converted into 100,000,000 shares of the Company's common stock. In addition, all options to purchase shares of BBG Common Stock and all common stock awards and performance-based cash unit awards relating to BBG Common Stock that were outstanding immediately prior to the closing of the Merger were generally converted into corresponding awards relating to shares of the Company's common stock on the same terms and conditions (excluding performance conditions) as applied prior to the closing of the Merger (with 2016 and 2017 Program performance-based cash units converting into time-based common stock awards based on actual performance for the 2016 program and target performance for the 2017 program through the closing date). See Note 11 for additional information on equity compensation. In March 2018, the Company terminated the Equity Distribution Agreement, dated as of June 2015, by and between the Company and Goldman, Sachs and Co., which established an "at-the-market" program for sales of common stock from time to time. The agreement was terminable at will upon written notification by the Company with no penalty. No shares had been sold pursuant to this agreement.

Equity Incentive Compensation P

Equity Incentive Compensation Plans and Other Long-term Incentive Programs	9 Months Ended
	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Compensation Plans and Other Long-term Incentive Programs	Equity Incentive Compensation Plans and Other Long-term Incentive Programs The Company maintains various stock-based compensation plans and other employee benefits as discussed below. Stock-based compensation is measured at the grant date based on the value of the awards, and the fair value is recognized on a straight-line basis over the requisite service period (usually the vesting period). Nonvested shares of common stock generally vest ratably over a three year service period and nonvested shares of common stock units vest over a one year service period. Cash-based compensation is measured at fair value at each reporting date and is recognized on a straight-line basis over the requisite service period (usually the vesting period). Cash-based awards generally have a cliff vest of three years . The following table presents the long-term equity and cash incentive compensation related to awards for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Nonvested common stock (1) $ 1,654 $ 1,434 $ 4,504 $ 4,437 Nonvested common stock units (1) 344 174 791 516 Nonvested performance-based shares (1) — — — 558 Nonvested performance cash units (2)(3) 257 1,073 635 (27 ) Total $ 2,255 $ 2,681 $ 5,930 $ 5,484 (1) Unrecognized compensation expense as of September 30, 2018 was $10.0 million , which related to grants of nonvested shares of common stock that are expected to be recognized over a weighted-average period of 1.9 years . (2) The nonvested performance-based cash units are accounted for as liability awards with $1.4 million in accounts payable and accrued liabilities as of December 31, 2017 and $0.9 million and $3.0 million in derivatives and other noncurrent liabilities as of September 30, 2018 and December 31, 2017 , respectively, in the Unaudited Consolidated Balance Sheets. (3) Liability awards are fair valued at each reporting date. The expense for the period will increase or decrease based on updated fair values of these awards at each reporting date. Nonvested Equity and Cash Awards. The following tables present the equity and cash awards granted pursuant to the Company's various stock compensation plans. A summary of the Company's nonvested common stock awards for the three and nine months ended September 30, 2018 and 2017 is presented below: Three Months Ended September 30, 2018 Three Months Ended September 30, 2017 Nonvested Common Stock Awards Shares Weighted Average Shares Weighted Average Outstanding at July 1, 2,858,278 $ 5.28 1,400,260 $ 7.10 Granted 123,094 6.79 5,267 3.31 Vested (25,432 ) 7.16 (13,721 ) 15.35 Forfeited or expired (38,292 ) 5.34 (550 ) 15.15 Outstanding at September 30, 2,917,648 5.33 1,391,256 7.00 Nine Months Ended September 30, 2018 Nine Months Ended September 30, 2017 Nonvested Common Stock Awards Shares Weighted Average Shares Weighted Average Outstanding at January 1, 1,394,868 $ 7.00 1,169,099 $ 9.33 Granted 1,140,542 5.60 782,511 5.99 Modified (1) 1,146,305 4.84 — — Vested (693,364 ) 8.24 (508,613 ) 10.71 Forfeited or expired (70,703 ) 5.98 (51,741 ) 7.87 Outstanding at September 30, 2,917,648 5.33 1,391,256 7.00 (1) Due to the closing of the Merger, the 2016 and 2017 Performance Cash Programs were converted from nonvested performance-based cash units to nonvested common stock awards, resulting in an increase of nonvested common stock awards for the nine months ended September 30, 2018 . A summary of the Company's nonvested common stock unit awards for the three and nine months ended September 30, 2018 and 2017 is presented below: Three Months Ended September 30, 2018 Three Months Ended September 30, 2017 Nonvested Common Stock Unit Awards Units Weighted Average Units Weighted Average Outstanding at July 1, 302,417 $ 7.37 272,559 $ 6.37 Granted 18,695 4.88 3,787 4.29 Vested (18,695 ) 4.88 (3,787 ) 4.29 Outstanding at September 30, 302,417 7.37 272,559 6.37 Nine Months Ended September 30, 2018 Nine Months Ended September 30, 2017 Nonvested Common Stock Unit Awards Units Weighted Average Units Weighted Average Outstanding at January 1, 272,559 $ 6.37 147,167 $ 10.09 Granted 180,778 6.63 190,711 3.53 Vested (150,920 ) 4.66 (65,319 ) 6.49 Outstanding at September 30, 302,417 7.37 272,559 6.37 A summary of the Company's nonvested performance-based cash unit awards for the three and nine months ended September 30, 2018 and 2017 is presented below: Three Months Ended September 30, 2018 Three Months Ended September 30, 2017 Nonvested Performance-Based Cash Unit Awards Units Weighted Average Units Weighted Average Outstanding at July 1, 846,256 1,537,198 Granted 89,037 5,267 Forfeited or expired (16,232 ) — Outstanding at September 30, 919,061 $ 4.88 1,542,465 $ 4.29 Nine Months Ended September 30, 2018 Nine Months Ended September 30, 2017 Nonvested Performance-Based Cash Unit Awards Units Weighted Average Units Weighted Average Outstanding at January 1, 1,548,083 942,326 Granted 935,293 663,425 Performance goal adjustment (1) 11,289 — Modified (2) (1,211,478 ) — Vested (286,652 ) — Forfeited or expired (77,474 ) (63,286 ) Outstanding at September 30, 919,061 $ 4.88 1,542,465 $ 4.29 (1) The 2015 Program vested at 104.1% in excess of target level and resulted in additional units vested in March 2018. These units are included in the vested line item for the nine months ended September 30, 2018 . (2) Due to the closing of the Merger, the 2016 and 2017 Performance Cash Programs were converted from nonvested performance-based cash units to nonvested common stock awards, resulting in a decrease in nonvested performance-based cash units for the nine months ended September 30, 2018 . The 2016 Program converted based on its performance through March 19, 2018, which resulted in 89% of the units converting to nonvested common stock awards or a reduction of 65,173 units converting to nonvested common stock awards. Performance Cash Program 2018 Program. In February 2018, the Compensation Committee of the Board of Directors of the Company approved a performance cash program (the "2018 Program") granting performance cash units that will settle in cash and are accounted for as liability awards. The performance-based awards contingently vest in February 2021, depending on the level at which the performance goal is achieved. The performance goal, which will be measured over the three -year period ending December 31, 2020, will be the Company's total shareholder return ("TSR") based on a matrix measurement of (1) the Company's absolute performance and (2) the Company's ranking relative to a defined peer group's individual TSRs ("Relative TSR"). The Company's absolute performance is measured against the December 29, 2017 closing share price of $5.13 . If the Company's absolute performance is lower than the $5.13 share price, the payout is zero for this portion. If the Company's absolute performance is greater than the $5.13 share price, the performance cash units will vest 1% for each 1% in growth, up to 150% of the original grant. If the Company's Relative TSR is less than the median, the payout is zero for this portion. If the Company's Relative TSR is above the median, the payout is equal to the Company's percentile rank above the median, up to 50% of the original grant. The Company's combined absolute performance and Relative TSR have a maximum vest of up to 200% of the original grant. 2017 Program. In February 2017, the Compensation Committee approved a performance cash program (the "2017 Program") granting performance cash units that would settle in cash and were accounted for as liability awards. In March 2018, upon the Merger closing, each award under the 2017 Program was converted to a nonvested common stock award at 100% of the original award. At the time of the modification, 619,006 units were converted to 619,006 nonvested shares of the Company's common stock. These awards no longer have a performance criterion, but continue to have a service-based criterion through the cliff vest in February 2020. The conversion of the performance-based liability award to a service-based equity award was accounted for as a modification in accordance with ASC 718, Compensation - Stock Compensation . The Company recorded an increase to additional paid-in capital ("APIC") and a decrease to derivative and other noncurrent liabilities of $0.9 million as of September 30, 2018 in the Unaudited Consolidated Statement of Stockholders' Equity and the Unaudited Consolidated Balance Sheets, respectively. 2016 Program. In March 2016, the Compensation Committee approved a performance cash program (the "2016 Program") granting performance cash units that would settle in cash and were accounted for as liability awards. In March 2018, upon the Merger closing, each award under the 2016 Program was converted to a nonvested common stock award at 89% of the original award based on the Company's performance through March 19, 2018. At the time of the modification, 592,472 units were converted to 527,299 nonvested shares of the Company's common stock. These awards no longer have a performance criterion, but continue to have a service-based criterion through the cliff vest in February 2019. The conversion of the performance-based liability award to a service-based equity award was accounted for as a modification in accordance with ASC 718, Compensation - Stock Compensation . The Company recorded an increase to APIC and a decrease to derivative and other noncurrent liabilities of $1.8 million as of September 30, 2018 in the Unaudited Consolidated Statement of Stockholders' Equity and the Unaudited Consolidated Balance Sheets, respectively. 2015 Program. In February 2015, the Compensation Committee approved a performance cash program (the "2015 Program") granting performance cash units that would settle in cash and were accounted for as liability awards. The performance-based awards were to contingently vest in May 2018, depending on the level at which the performance goals were achieved. The performance goals, which were measured over the three year period ending December 31, 2017, consisted of the TSR compared to Relative TSR (weighted at 60% ) and the percentage change in discretionary cash flow per debt adjusted share relative to a defined peer group's percentage calculation ("DCF per Debt Adjusted Share") (weighted at 40% ). The Relative TSR and DCF per Debt Adjusted Share goals would vest at 25% or 50% , respectively, of the total award for performance met at the threshold level, 100% at the target level and 200% at the stretch level. If the actual results for a metric were between the threshold and target levels or between the target and stretch levels, the vested number of units would be prorated based on the actual results compared to the threshold, target and stretch goals. If the threshold metrics were not met, no units would vest. In any event, the total number of units that could vest would not exceed 200% of the original number of performance cash units granted. At the end of the three year vesting period, any units that had not vested would be forfeited. A total of 422,345 units were granted under this program during the year ended December 31, 2015. All compensation expense related to the TSR metric would be recognized if the requisite service period was fulfilled, even if the market condition was not achieved. All compensation expense related to the DCF per Debt Adjusted Share metric would be based on the number of shares expected to vest at the end of the three year period. The Company modified the vesting date of these awards from May 2018 to March 2018. Based upon the Company's performance through 2017, 104.1% or 286,652 units of the 2015 Program vested in March 2018.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Financing Obligation. The Company has a Lease Financing Obligation with Bank of America Leasing & Capital, LLC as the lead bank as discussed in Note 5 . The aggregate undiscounted minimum future lease payments, including both principal and interest components, are presented below. The Company has elected to exercise the early buyout option pursuant to which the Company will purchase the equipment for $1.8 million on February 10, 2019. As of September 30, 2018 (in thousands) 2018 $ 134 2019 1,869 Thereafter — Total $ 2,003 Firm Transportation Agreements. The Company is party to two firm transportation contracts, through July 2021, to provide capacity on natural gas pipeline systems. The contracts require the Company to pay transportation charges regardless of the amount of pipeline capacity utilized by the Company. These monthly transportation payments are included in unused commitments expense in the Unaudited Consolidated Statements of Operations. As a result of previous divestitures in 2013 and 2014, the Company will likely not utilize the firm capacity on the natural gas pipelines. The amounts in the table below represent the Company's future minimum transportation charges: As of September 30, 2018 (in thousands) 2018 $ 4,572 2019 18,590 2020 18,691 2021 10,903 Thereafter — Total $ 52,756 Gas Gathering and Processing Agreements. The Company is party to three minimum volume commitments and one reimbursement obligation. The minimum volume commitments require the Company to deliver a minimum volume of natural gas to midstream entities for gathering and processing. The contracts require the Company to pay a fee associated with the contracted volumes regardless of the amount delivered. The reimbursement obligation requires the Company to pay a monthly gathering and processing fee per Mcf of production over a one year period to reimburse a midstream entity for its costs to construct gas gathering and processing facilities. If the costs are not reimbursed by the Company via the monthly gathering and processing fees through August 2019, the Company must pay the difference. The amounts in the table below represent the Company's future minimum charges under both agreements: As of September 30, 2018 (in thousands) 2018 $ 2,737 2019 (1) 10,114 2020 2,167 2021 1,997 Thereafter — Total $ 17,015 (1) Includes $6.9 million associated with the reimbursement obligation discussed above. Lease and Other Commitments. The Company leases office space, vehicles and certain equipment under non-cancellable operating leases. The Company incurred rent expense related to these operating leases of $0.8 million and $2.0 million for the three and nine months ended September 30, 2018 , respectively, and $0.5 million and $1.5 million for the three and nine months ended September 30, 2017 , respectively. The Company also has non-cancellable agreements for telecommunication and geological and geophysical services. Future minimum annual payments under lease and other agreements are as follows: As of September 30, 2018 (in thousands) 2018 $ 2,604 2019 4,404 2020 2,532 2021 2,821 2022 2,764 Thereafter 13,087 Total $ 28,212 Litigation. The Company is subject to litigation, claims and governmental and regulatory proceedings arising in the ordinary course of business. It is the opinion of the Company's management that current claims and litigation involving the Company are not likely to have a material adverse effect on its Unaudited Consolidated Balance Sheet, Cash Flows or Statements of Operations.

Guarantor Subsidiaries

Guarantor Subsidiaries	9 Months Ended
	Sep. 30, 2018
Condensed Financial Information Disclosure [Abstract]
Guarantor Subsidiaries	Guarantor Subsidiaries The condensed consolidating financial information as of and for the periods ended September 30, 2018 presents the results of operations, financial position and cash flows of HighPoint Resources Corporation, or parent guarantor, and HighPoint Operating Corporation (f/k/a Bill Barrett), or subsidiary issuer, as well as the consolidating adjustments necessary to present HighPoint Resources Corporation's results on a consolidated basis. The parent guarantor fully and unconditionally guarantees the debt securities of the subsidiary issuer. The indentures governing those securities limit the ability of the subsidiary issuer to pay dividends or otherwise provide funding to the parent guarantor. In September 2018, Circle B Land Company LLC, a 100% owned subsidiary, merged into its parent company, HighPoint Operating Corporation. Prior periods are presented under the structure of the Company prior to the Merger and prior to the elimination of Circle B Land Company LLC. Circle B Land Company LLC and Aurora Gathering, LLC (both of which were 100% owned subsidiaries of the Company), on a joint and several basis, fully and unconditionally guaranteed the debt of Bill Barrett, the parent issuer. On December 29, 2017, the Company completed the sale of its remaining assets in the Uinta Basin, which included the equity of Aurora Gathering, LLC. For the purpose of the following financial information, investments in subsidiaries are reflected in accordance with the equity method of accounting. The financial information may not necessarily be indicative of results of operations, cash flows, or financial position had the subsidiaries operated as independent entities. Condensed Consolidating Balance Sheets As of September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Assets: Cash and cash equivalents $ — $ 92,980 $ — $ 92,980 Accounts receivable, net of allowance for doubtful accounts — 68,035 — 68,035 Other current assets — 2,967 — 2,967 Property and equipment, net — 1,973,869 — 1,973,869 Intercompany receivable — — — — Investment in subsidiaries 987,797 — (987,797 ) — Noncurrent assets — 6,795 — 6,795 Total assets $ 987,797 $ 2,144,646 $ (987,797 ) $ 2,144,646 Liabilities and Stockholders' Equity: Accounts payable and other accrued liabilities $ — $ 147,590 $ — $ 147,590 Other current liabilities — 191,242 — 191,242 Long-term debt — 617,006 — 617,006 Deferred income taxes — 137,111 — 137,111 Other noncurrent liabilities — 63,900 — 63,900 Stockholders' equity 987,797 987,797 (987,797 ) 987,797 Total liabilities and stockholders' equity $ 987,797 $ 2,144,646 $ (987,797 ) $ 2,144,646 As of December 31, 2017 Parent Subsidiary Intercompany Consolidated (in thousands) Assets: Cash and cash equivalents $ 314,466 $ — $ — $ 314,466 Accounts receivable, net of allowance for doubtful accounts 51,415 — — 51,415 Other current assets 1,782 — — 1,782 Property and equipment, net 1,016,986 1,894 — 1,018,880 Intercompany receivable 854 — (854 ) — Investment in subsidiaries 1,040 — (1,040 ) — Noncurrent assets 4,163 — — 4,163 Total assets $ 1,390,706 $ 1,894 $ (1,894 ) $ 1,390,706 Liabilities and Stockholders' Equity: Accounts payable and other accrued liabilities $ 84,055 $ — $ — $ 84,055 Other current liabilities 64,879 — — 64,879 Intercompany payable — 854 (854 ) — Long-term debt 617,744 — — 617,744 Other noncurrent liabilities 25,474 — — 25,474 Stockholders' equity 598,554 1,040 (1,040 ) 598,554 Total liabilities and stockholders' equity $ 1,390,706 $ 1,894 $ (1,894 ) $ 1,390,706 Condensed Consolidating Statements of Operations Three Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Operating and other revenues $ — $ 131,126 $ — $ 131,126 Operating expenses — (83,172 ) — (83,172 ) General and administrative — (12,696 ) — (12,696 ) Merger transaction expense — (100 ) — (100 ) Interest expense — (13,165 ) — (13,165 ) Interest income and other income (expense) — (51,353 ) — (51,353 ) Income (loss) before income taxes and equity in earnings (loss) of subsidiaries — (29,360 ) — (29,360 ) (Provision for) benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries (29,360 ) — 29,360 — Net income (loss) $ (29,360 ) $ (29,360 ) $ 29,360 $ (29,360 ) Nine Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Operating and other revenues $ — $ 322,334 $ — $ 322,334 Operating expenses — (217,042 ) — (217,042 ) General and administrative — (34,427 ) — (34,427 ) Merger transaction expense — (6,140 ) — (6,140 ) Interest expense — (39,348 ) — (39,348 ) Interest income and other income (expense) — (126,580 ) — (126,580 ) Income (loss) before income taxes and equity in earnings (loss) of subsidiaries — (101,203 ) — (101,203 ) (Provision for) benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries (101,203 ) — 101,203 — Net income (loss) $ (101,203 ) $ (101,203 ) $ 101,203 $ (101,203 ) Three Months Ended September 30, 2017 Parent Subsidiary Intercompany Consolidated (in thousands) Operating and other revenues $ 67,697 $ 168 $ — $ 67,865 Operating expenses (58,053 ) (156 ) — (58,209 ) General and administrative (12,496 ) — — (12,496 ) Interest expense (13,926 ) — — (13,926 ) Interest income and other income (expense) (12,076 ) — — (12,076 ) Income (loss) before income taxes and equity in earnings (loss) of subsidiaries (28,854 ) 12 — (28,842 ) (Provision for) benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries 12 — (12 ) — Net income (loss) $ (28,842 ) $ 12 $ (12 ) $ (28,842 ) Nine Months Ended September 30, 2017 Parent Subsidiary Intercompany Eliminations Consolidated (in thousands) Operating and other revenues $ 169,041 $ 426 $ — $ 169,467 Operating expenses (167,363 ) (486 ) — (167,849 ) General and administrative (30,788 ) — — (30,788 ) Interest expense (44,014 ) — — (44,014 ) Interest income and other income (expense) 12,780 — — 12,780 Income (loss) before income taxes and equity in earnings (loss) of subsidiaries (60,344 ) (60 ) — (60,404 ) (Provision for) benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries (60 ) — 60 — Net income (loss) $ (60,404 ) $ (60 ) $ 60 $ (60,404 ) Condensed Consolidating Statements of Comprehensive Income (Loss) Three Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Net income (loss) $ (29,360 ) $ (29,360 ) $ 29,360 $ (29,360 ) Other comprehensive loss — — — — Comprehensive income (loss) $ (29,360 ) $ (29,360 ) $ 29,360 $ (29,360 ) Nine Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Net income (loss) $ (101,203 ) $ (101,203 ) $ 101,203 $ (101,203 ) Other comprehensive loss — — — — Comprehensive income (loss) $ (101,203 ) $ (101,203 ) $ 101,203 $ (101,203 ) Three Months Ended September 30, 2017 Parent Subsidiary Intercompany Eliminations Consolidated (in thousands) Net income (loss) $ (28,842 ) $ 12 $ (12 ) $ (28,842 ) Other comprehensive loss — — — — Comprehensive income (loss) $ (28,842 ) $ 12 $ (12 ) $ (28,842 ) Nine Months Ended September 30, 2017 Parent Subsidiary Intercompany Consolidated (in thousands) Net income (loss) $ (60,404 ) $ (60 ) $ 60 $ (60,404 ) Other comprehensive loss — — — — Comprehensive income (loss) $ (60,404 ) $ (60 ) $ 60 $ (60,404 ) Condensed Consolidating Statements of Cash Flows Nine Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Cash flows from operating activities $ — $ 160,185 $ — $ 160,185 Cash flows from investing activities: Additions to oil and gas properties, including acquisitions — (322,614 ) — (322,614 ) Additions to furniture, fixtures and other — (616 ) — (616 ) Repayment of debt associated with merger, net of cash acquired — (53,357 ) — (53,357 ) Proceeds from sale of properties and other investing activities — 11 — 11 Intercompany transfers — — — — Cash flows from financing activities: Principal payments on debt — (350 ) — (350 ) Proceeds from sale of common stock, net of offering costs — 1 — 1 Intercompany transfers — — — — Other financing activities — (4,746 ) — (4,746 ) Change in cash and cash equivalents — (221,486 ) — (221,486 ) Beginning cash and cash equivalents — 314,466 — 314,466 Ending cash and cash equivalents $ — $ 92,980 $ — $ 92,980 Nine Months Ended September 30, 2017 Parent Subsidiary Intercompany Consolidated (in thousands) Cash flows from operating activities $ 95,009 $ 374 $ — $ 95,383 Cash flows from investing activities: Additions to oil and gas properties, including acquisitions (160,788 ) — — (160,788 ) Additions to furniture, fixtures and other (268 ) — — (268 ) Proceeds from sale of properties and other investing activities (712 ) — — (712 ) Intercompany transfers 374 — (374 ) — Cash flows from financing activities: Proceeds from debt 275,000 — — 275,000 Principal payments on debt (322,228 ) — — (322,228 ) Proceeds from sale of common stock, net of offering costs (298 ) — — (298 ) Intercompany transfers — (374 ) 374 — Other financing activities (6,045 ) — — (6,045 ) Change in cash and cash equivalents (119,956 ) — — (119,956 ) Beginning cash and cash equivalents 275,841 — — 275,841 Ending cash and cash equivalents $ 155,885 $ — $ — $ 155,885

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation. The accompanying Unaudited Consolidated Financial Statements include the accounts of the Company. These statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the accompanying consolidated financial statements include all adjustments (consisting of normal recurring accruals and adjustments) necessary to present fairly, in all material respects, the Company's interim results. However, operating results for the periods presented are not necessarily indicative of the results that may be expected for the full year. The Annual Report on Form 10-K filed by the Company's predecessor Bill Barrett for the year ended December 31, 2017 includes certain definitions and a summary of significant accounting policies and should be read in conjunction with this Quarterly Report on Form 10-Q. Except as disclosed herein, there have been no material changes to the information disclosed in the notes to the consolidated financial statements included in the Bill Barrett 2017 Annual Report on Form10-K. The results of operations attributable to the merged companies are included in the Unaudited Consolidated Statements of Operations beginning on March 19, 2018.
Use of Estimates	Use of Estimates. In the course of preparing the Company's financial statements in accordance with GAAP, management makes various assumptions, judgments and estimates to determine the reported amount of assets, liabilities, revenues and expenses and in the disclosure of commitments and contingencies. Changes in these assumptions, judgments and estimates will occur as a result of the passage of time and the occurrence of future events and, accordingly, actual results could differ from amounts initially established. Areas requiring the use of assumptions, judgments and estimates relate to volumes of oil, natural gas and NGL reserves used in calculating depreciation, depletion and amortization ("DD&A"), the amount of expected future cash flows used in determining possible impairments of oil and gas properties and the amount of future capital costs used in these calculations. Assumptions, judgments and estimates also are required in determining the fair values of assets acquired and liabilities assumed in business combinations, asset retirement obligations, the timing of dry hole costs, impairments of proved and unproved oil and gas properties, valuing deferred tax assets and estimating fair values of derivative instruments and stock-based payment awards.
Oil and Gas Properties	Oil and Gas Properties. The Company's oil, gas and NGL exploration and production activities are accounted for using the successful efforts method. Under this method, all property acquisition costs and costs of exploratory and development wells are capitalized when incurred, pending determination of whether the well has found proved reserves. If an exploratory well does not find proved reserves, the costs of drilling the well are charged to expense and remain within cash flows from investing activities in the Unaudited Consolidated Statements of Cash Flows. If an exploratory well does find proved reserves, the costs remain capitalized, are included within additions to oil and gas properties and remain within cash flows from investing activities in the Unaudited Consolidated Statements of Cash Flows. The costs of development wells are capitalized whether proved reserves are added or not. Oil and gas lease acquisition costs are also capitalized. Upon sale or retirement of depreciable or depletable property, the cost and related accumulated DD&A are eliminated from the accounts and the resulting gain or loss is recognized. Other exploration costs, including certain geological and geophysical expenses and delay rentals for oil and gas leases, are charged to expense as incurred. The sale of a partial interest in a proved property is accounted for as a cost recovery and no gain or loss is recognized as long as this treatment does not significantly affect the unit-of-production amortization rate. Maintenance and repairs are charged to expense, and renewals and betterments are capitalized to the appropriate property and equipment accounts. Unproved oil and gas property costs are transferred to proved oil and gas properties if the properties are subsequently determined to be productive or are assigned proved reserves. Proceeds from sales of partial interests in unproved leases are accounted for as a recovery of cost without recognizing any gain until all costs are recovered. Unproved oil and gas properties are assessed periodically for impairment based on remaining lease terms, drilling results, reservoir performance, commodity price outlooks, future plans to develop acreage, recent sales prices of comparable properties and other relevant matters. Materials and supplies consist primarily of tubular goods and well equipment to be used in future drilling operations or repair operations and are carried at the lower of cost or market value. The following table sets forth the net capitalized costs and associated accumulated DD&A and non-cash impairments relating to the Company's oil, natural gas and NGL producing activities: As of September 30, 2018 As of December 31, 2017 (in thousands) Proved properties $ 427,982 $ 230,800 Wells and related equipment and facilities 1,370,616 1,088,692 Support equipment and facilities 64,324 38,776 Materials and supplies 13,742 2,900 Total proved oil and gas properties $ 1,876,664 $ 1,361,168 Unproved properties 549,342 18,832 Wells and facilities in progress 108,199 65,844 Total unproved oil and gas properties, excluded from amortization $ 657,541 $ 84,676 Accumulated depreciation, depletion, amortization and impairment (567,156 ) (433,234 ) Total oil and gas properties, net (1) $ 1,967,049 $ 1,012,610 (1) Total oil and gas properties, net includes $722.0 million of properties acquired in the Merger. See Note 4 for additional information regarding the Merger. The Company reviews oil and natural gas properties for impairment on a quarterly basis or whenever events and circumstances indicate that a decline in the recoverability of their carrying value may have occurred. The Company estimates the expected undiscounted future net cash flows of its oil and gas properties using proved and risked probable and possible reserves based on the Company's development plans and best estimate of future production, commodity pricing, reserve risking, gathering and transportation deductions, production tax rates, lease operating expenses and future development costs. The Company compares such undiscounted future net cash flows to the carrying amount of the oil and gas properties to determine if the carrying amount is recoverable. If the undiscounted future net cash flows exceed the carrying amount of the oil and gas properties, no impairment is taken. If the carrying amount of a property exceeds the undiscounted future net cash flows, the Company will impair the carrying value to fair value based on an analysis of quantitative and qualitative factors existing as of the balance sheet date. The Company does not believe that the undiscounted future net cash flows of its oil and gas properties represent the applicable market value. The factors used to determine fair value may include, but are not limited to, recent sales prices of comparable properties, indications from marketing activities, the present value of future revenues, net of estimated operating and development costs using estimates of reserves, future commodity pricing, future production estimates, anticipated capital expenditures and various discount rates commensurate with the risk and current market conditions associated with realizing the projected cash flows. The Company recognized non-cash impairment charges, which were included within impairment, dry hole costs and abandonment expense in the Unaudited Consolidated Statements of Operations, as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Impairment of unproved oil and gas properties (1) $ — $ — $ — $ 8,010 Abandonment expense and lease expirations 184 261 609 326 Total impairment, dry hole costs and abandonment expense $ 184 $ 261 $ 609 $ 8,336 (1) The Company recognized impairment related to unproved oil and gas properties in the Cottonwood Gulch area of the Piceance Basin during the nine months ended September 30, 2017 . The Company had no current plan to develop this acreage. The provision for DD&A of oil and gas properties is calculated on a field-by-field basis based on geologic and reservoir delineation using the unit-of-production method. Natural gas and NGLs are converted to an oil equivalent, Boe, at the standard rate of six Mcf to one Boe and forty-two gallons to one Boe, respectively. Estimated future dismantlement, restoration and abandonment costs are taken into consideration by this calculation.
Accounts Payable and Accrued Liabilities	Accounts Payable and Other Accrued Liabilities. Accounts payable and other accrued liabilities are comprised of the following: As of September 30, 2018 As of December 31, 2017 (in thousands) Accrued drilling, completion and facility costs (1) $ 97,634 $ 35,856 Accrued lease operating, gathering, transportation and processing expenses 7,104 4,360 Accrued general and administrative expenses 8,248 11,134 Accrued interest payable 18,355 6,484 Accrued merger transaction expenses 174 8,278 Accrued hedge settlements 6,411 65 Prepayments from partners 937 2,524 Trade payables 5,341 10,067 Other 3,386 5,287 Total accounts payable and other accrued liabilities $ 147,590 $ 84,055 (1) The increase as of September 30, 2018 is due to an increase in drilling and completions activity.
Environmental Liabilities	Environmental Liabilities. Environmental expenditures that relate to an existing condition caused by past operations and that do not contribute to current or future revenue generation are expensed. Environmental liabilities are accrued when environmental assessments and/or clean-ups are probable, and the costs can be reasonably estimated. Recent case law in Wyoming has exposed the Company to obligations for plugging and abandoning wells, and associated reclamation, for assets that were sold to other industry parties in prior years that are now in default. Regulatory agencies and landowners have demanded that the Company perform such activities.
Revenue Recognition	Revenue Recognition. All of the Company's sales of oil, gas and NGLs are made under contracts with customers, whereby revenues are recognized when the Company satisfies its performance obligations and the customer obtains control of the product. Performance obligations under the Company's contracts with customers are typically satisfied at a point-in-time through monthly delivery of oil, gas and/or NGLs. Accordingly, at the end of the reporting period, the Company does not have any unsatisfied performance obligations. The Company's contracts with customers typically include variable consideration based on monthly pricing tied to local indices and volumes delivered in the current month. The nature of the Company's contracts with customers does not require the Company to constrain variable consideration for accounting purposes. As of September 30, 2018 , the Company had open contracts with customers with terms of 1 month to 19 years , as well as evergreen contracts that renew on a periodic basis if not canceled by the Company or the customer. The Company's contracts with customers typically require payment within one month of delivery. Under the Company's contracts with customers, natural gas and its components, including NGLs, are either sold to a midstream entity (which processes the natural gas and subsequently sells the resulting residue gas and NGLs) or are sold to a gas or NGL purchaser after being processed by a third party for a fee. Regardless of the contract structure type, the terms of these contracts compensate the Company for the value of the residue gas and NGLs at current market prices for each product. The Company's oil is sold to multiple oil purchasers at specific delivery points at or near the wellhead. All costs incurred to gather, transport and/or process the Company's oil, gas and NGLs after control has transferred to the customer are considered components of the consideration received from the customer and thus recorded in oil, gas and NGL production revenues in the Unaudited Consolidated Statements of Operations. All costs incurred prior to the transfer of control to the customer are included in gathering, transportation and processing expense in the Unaudited Consolidated Statements of Operations. Gas imbalances from the sale of natural gas are recorded on the basis of gas actually sold by the Company. If the Company's aggregate sales volumes for a well are greater (or less) than its proportionate share of production from the well, a liability (or receivable) is established to the extent there are insufficient proved reserves available to make-up the overproduced (or underproduced) imbalance. Imbalances have not been significant in the periods presented.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities. The Company periodically uses derivative financial instruments to achieve a more predictable cash flow from its oil, natural gas and NGL sales by reducing its exposure to price fluctuations. Derivative instruments are recorded at fair market value and are included in the Unaudited Consolidated Balance Sheets as assets or liabilities.
Income Taxes	Income Taxes. Income taxes are provided for the tax effects of transactions reported in the financial statements and consist of taxes currently payable plus deferred income taxes related to certain income and expenses recognized in different periods for financial and income tax reporting purposes. Deferred income tax assets and liabilities represent the future tax return consequences of those differences, which will either be taxable or deductible when assets are recovered or liabilities are settled. Deferred income taxes also include tax credits and net operating losses that are available to offset future income taxes. Deferred income taxes are measured by applying currently enacted tax rates. Deferred tax assets are regularly reviewed, considering all positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, planning strategies and results of recent operations. The assumptions about future taxable income require significant judgment to determine whether it is more likely than not that the deferred tax asset will be realized. Changes to the Company's development plans, increases in market prices for hydrocarbons, improvements in our operating results, or other factors, could result in a release of some or all of the valuation allowance in a future period which would result in the recognition of a tax benefit. The Company accounts for uncertainty in income taxes for tax positions taken or expected to be taken in a tax return. Only tax positions that meet the more-likely-than-not recognition threshold are recognized. The Company does not have any uncertain tax positions recorded as of September 30, 2018 .
Earnings/Loss Per Share	Earnings/Loss Per Share. Basic net income (loss) per common share is calculated by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding during each period. Diluted net income (loss) per common share is calculated by dividing net income (loss) attributable to common stock by the weighted average number of common shares outstanding and other dilutive securities. Potentially dilutive securities for the diluted net income per common share calculations consist of nonvested shares of common stock and outstanding in-the-money stock options to purchase the Company's common stock. As the Company was in a net loss position, all potentially dilutive securities were anti-dilutive for the three and nine months ended September 30, 2018 and 2017 . The following table sets forth the calculation of basic and diluted income (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands, except per share amounts) Net income (loss) $ (29,360 ) $ (28,842 ) $ (101,203 ) $ (60,404 ) Basic weighted-average common shares outstanding in period 209,502 74,886 181,145 74,743 Diluted weighted-average common shares outstanding in period 209,502 74,886 181,145 74,743 Basic net income (loss) per common share $ (0.14 ) $ (0.39 ) $ (0.56 ) $ (0.81 ) Diluted net income (loss) per common share $ (0.14 ) $ (0.39 ) $ (0.56 ) $ (0.81 )
New Accounting Pronouncements	New Accounting Pronouncements. In August 2018, the Securities and Exchange Commission, ("SEC") issued a final rule, Disclosure Update and Simplification , that updates and simplifies SEC disclosure requirements. The primary changes include removing the requirement to disclose outside of the consolidated financial statements historical and pro forma ratios of earnings to fixed charges and historical low and high trading prices and adding a requirement to provide within the interim financial statements an analysis of changes in stockholders' equity for the current and comparative quarterly and year-to-date periods. Other changes included requirements related to segment, geographic area and dividend disclosures. The final rule will be effective November 5, 2018 and will not have a material impact on the Company's disclosures. In August 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-13, Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement . The objective of this update is to improve the effectiveness of fair value measurement disclosures. ASU 2018-13 is effective for annual periods beginning after December 15, 2019, and interim periods within those annual periods. The standard will only impact the Company's disclosures. In June 2018, the FASB issued ASU 2018-07, Stock Compensation-Improvements to Non-employee Share-Based Payment Accounting . The objective of this update is to simplify several aspects of the accounting for non-employee share-based payment transactions resulting from expanding the scope of Topic 718, Compensation- Stock Compensation , to include share-based payment transactions for acquiring goods and services from non-employees. ASU 2018-07 is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods. The standard will not have a material impact on the Company's disclosures and financial statements. In May 2017, the FASB issued ASU 2017-09, Stock Compensation-Scope of Modification Accounting . The objective of this update is to provide clarity and reduce both diversity in practice and cost and complexity when applying a change to the terms or conditions of a share-based payment award. ASU 2017-09 was effective for annual periods beginning after December 15, 2017, and interim periods within those annual periods. The standard was adopted on January 1, 2018 and did not have a material impact on the Company's disclosures and financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations: Clarifying the definition of a business . The objective of this update is to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 was effective for annual and interim periods beginning after December 15, 2017. The standard was adopted prospectively on January 1, 2018 and did not have a material impact on the Company's disclosures and financial statements. The accounting treatment of the Merger was not affected by this guidance. See Note 4 for additional information regarding the Merger. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows-Classification of Certain Cash Receipts and Cash Payments . The objective of this update is to address eight specific cash flow issues in order to reduce the existing diversity in practice. ASU 2016-15 was effective for the annual periods beginning after December 15, 2017, and interim periods within those annual periods. The standard was adopted on January 1, 2018 and did not have a material impact on the Company's disclosures and financial statements. In February 2016, the FASB issued ASU 2016-02, Leases, followed by additional accounting standards updates that provided additional practical expedients and policy election options (collectively, Accounting Standards Codification Topic 842, ("ASC 842")). The objective of ASC 842 is to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASC 842 is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods. The Company intends to adopt ASC 842 using the modified retrospective method and to use the option to not apply ASC 842 to comparative periods. The Company has also elected the following practical expedients: • not to recognize lease assets or liabilities on the balance sheet when lease terms are less than twelve months, • carryforward previous conclusions related to current lease classification under the current lease accounting standard to lease classification for these existing leases under ASC 842, and • exclude from evaluation under ASC 842 land easements that existed or expired before adoption of ASC 842. The Company has compiled and analyzed its contracts and has identified which leasing arrangements will be affected. However, the Company is still evaluating the full impact of adopting this standard. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. The objective of this update is to clarify the principles for recognizing revenue and to develop a common revenue standard. The FASB subsequently issued ASU 2015-14, ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20, which provided additional implementation guidance and deferred the effective date of ASU 2014-09. The standard was effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. The standard was adopted on January 1, 2018 using the modified retrospective transition method, which was applied to contracts in place at the date of adoption. The adoption required the Company to net some additional gathering, transportation and processing expenses against its oil, gas and NGL production revenues. However, the cash flow and timing of the Company's revenue was not impacted and therefore no impact on the Company's net income (loss) or net income (loss) per common share. The standard also required additional footnote disclosures. See the " Revenue Recognition" section above for additional disclosures.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Accounts Receivable	Accounts receivable is comprised of the following: As of September 30, 2018 As of December 31, 2017 (in thousands) Oil, gas and NGL sales $ 51,405 $ 36,569 Due from joint interest owners 16,607 14,779 Other 28 270 Allowance for doubtful accounts (5 ) (203 ) Total accounts receivable $ 68,035 $ 51,415
Net Capitalized Costs and Associated Accumulated DD&A and Non Cash Impairments	The following table sets forth the net capitalized costs and associated accumulated DD&A and non-cash impairments relating to the Company's oil, natural gas and NGL producing activities: As of September 30, 2018 As of December 31, 2017 (in thousands) Proved properties $ 427,982 $ 230,800 Wells and related equipment and facilities 1,370,616 1,088,692 Support equipment and facilities 64,324 38,776 Materials and supplies 13,742 2,900 Total proved oil and gas properties $ 1,876,664 $ 1,361,168 Unproved properties 549,342 18,832 Wells and facilities in progress 108,199 65,844 Total unproved oil and gas properties, excluded from amortization $ 657,541 $ 84,676 Accumulated depreciation, depletion, amortization and impairment (567,156 ) (433,234 ) Total oil and gas properties, net (1) $ 1,967,049 $ 1,012,610 (1) Total oil and gas properties, net includes $722.0 million of properties acquired in the Merger. See Note 4 for additional information regarding the Merger.
Non-Cash Impairment Charges, Included within Impairment, Dry Hole Costs and Abandonment Expense in Consolidated Statements of Operations	The Company recognized non-cash impairment charges, which were included within impairment, dry hole costs and abandonment expense in the Unaudited Consolidated Statements of Operations, as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Impairment of unproved oil and gas properties (1) $ — $ — $ — $ 8,010 Abandonment expense and lease expirations 184 261 609 326 Total impairment, dry hole costs and abandonment expense $ 184 $ 261 $ 609 $ 8,336 (1) The Company recognized impairment related to unproved oil and gas properties in the Cottonwood Gulch area of the Piceance Basin during the nine months ended September 30, 2017 . The Company had no current plan to develop this acreage.
Accounts Payable and Accrued Liabilities	Accounts payable and other accrued liabilities are comprised of the following: As of September 30, 2018 As of December 31, 2017 (in thousands) Accrued drilling, completion and facility costs (1) $ 97,634 $ 35,856 Accrued lease operating, gathering, transportation and processing expenses 7,104 4,360 Accrued general and administrative expenses 8,248 11,134 Accrued interest payable 18,355 6,484 Accrued merger transaction expenses 174 8,278 Accrued hedge settlements 6,411 65 Prepayments from partners 937 2,524 Trade payables 5,341 10,067 Other 3,386 5,287 Total accounts payable and other accrued liabilities $ 147,590 $ 84,055 (1) The increase as of September 30, 2018 is due to an increase in drilling and completions activity.
Calculation of Basic and Diluted Earnings (Loss) Per Share	The following table sets forth the calculation of basic and diluted income (loss) per share: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands, except per share amounts) Net income (loss) $ (29,360 ) $ (28,842 ) $ (101,203 ) $ (60,404 ) Basic weighted-average common shares outstanding in period 209,502 74,886 181,145 74,743 Diluted weighted-average common shares outstanding in period 209,502 74,886 181,145 74,743 Basic net income (loss) per common share $ (0.14 ) $ (0.39 ) $ (0.56 ) $ (0.81 ) Diluted net income (loss) per common share $ (0.14 ) $ (0.39 ) $ (0.56 ) $ (0.81 )

Supplemental Disclosures of C_2

Supplemental Disclosures of Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental cash flow information is as follows: Nine Months Ended September 30, 2018 2017 (in thousands) Cash paid for interest $ 25,746 $ 31,113 Cash paid for income taxes — — Supplemental disclosures of non-cash investing and financing activities: Accrued liabilities - oil and gas properties 101,838 37,319 Accrued liabilities - financing costs 215 — Change in asset retirement obligations, net of disposals 9,885 10,453 Retirement of treasury stock (1,533 ) (1,246 ) Properties exchanged in non-cash transactions — 13,323 Issuance of common stock for Merger 484,000 —

Mergers (Tables)

Mergers (Tables)	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Summary of Purchase Price Allocation	The following table sets forth the Company's preliminary purchase price allocation: March 19, 2018 (in thousands) Purchase Price: Fair value of common stock issued $ 484,000 Plus: Repayment of Fifth Creek debt 53,900 Total purchase price 537,900 Plus Liabilities Assumed: Accounts payable and accrued liabilities 25,782 Current unfavorable contract 2,651 Other current liabilities 13,797 Asset retirement obligations 7,361 Long-term deferred tax liability 137,111 Long-term unfavorable contract 4,449 Other noncurrent liabilities 2,354 Total purchase price plus liabilities assumed $ 731,405 Fair Value of Assets Acquired: Cash 543 Accounts receivable 7,831 Oil and Gas Properties: Proved oil and gas properties 105,702 Unproved oil and gas properties 608,972 Asset Retirement Obligations 7,361 Furniture, equipment and other 931 Other noncurrent assets 65 Total asset value $ 731,405
Summary of Pro Forma Financial Information	The pro forma condensed combined financial information has been included for comparative purposes and is not necessarily indicative of the results that might have actually occurred had the acquisition taken place on January 1, 2017; furthermore, the financial information is not intended to be a projection of future results. Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands, except per share data) Revenues $ 131,126 $ 80,973 $ 338,266 $ 195,727 Net Income (Loss) and Comprehensive Income (Loss) (29,260 ) (33,301 ) (98,993 ) (65,180 ) Net Income (Loss) per Common Share, Basic and Diluted (0.14 ) (0.19 ) (0.47 ) (0.37 )

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Outstanding Debt	The Company's outstanding debt is summarized below: As of September 30, 2018 As of December 31, 2017 Maturity Date Principal Debt Issuance Costs Carrying Amount Principal Debt Issuance Costs Carrying Amount (in thousands) Amended Credit Facility September 14, 2023 $ — $ — $ — $ — $ — $ — 7.0% Senior Notes (1) October 15, 2022 350,000 (3,419 ) 346,581 350,000 (4,033 ) 345,967 8.75% Senior Notes (2) June 15, 2025 275,000 (4,575 ) 270,425 275,000 (5,080 ) 269,920 Lease Financing Obligation (3) August 10, 2020 1,978 — 1,978 2,328 (2 ) 2,326 Total Debt $ 626,978 $ (7,994 ) $ 618,984 $ 627,328 $ (9,115 ) $ 618,213 Less: Current Portion of Long-Term Debt (4) 1,978 — 1,978 469 — 469 Total Long-Term Debt $ 625,000 $ (7,994 ) $ 617,006 $ 626,859 $ (9,115 ) $ 617,744 (1) The aggregate estimated fair value of the 7.0% Senior Notes was approximately $348.6 million and $356.1 million as of September 30, 2018 and December 31, 2017 , respectively, based on reported market trades of these instruments. (2) The aggregate estimated fair value of the 8.75% Senior Notes was approximately $290.2 million and $305.3 million as of September 30, 2018 and December 31, 2017 , respectively, based on reported market trades of these instruments. (3) The aggregate estimated fair value of the Lease Financing Obligation was approximately $1.8 million and $2.1 million as of September 30, 2018 and December 31, 2017 , respectively. As there is no active, public market for the Lease Financing Obligation, the aggregate estimated fair value was based on market-based parameters of comparable term secured financing instruments. (4) The current portion of long-term debt includes the current portion of the Lease Financing Obligation. The Company has elected to exercise the early buyout option pursuant to which the Company will purchase the equipment for $1.8 million on February 10, 2019.

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Asset Retirement Obligations	A reconciliation of the Company's asset retirement obligations for the nine months ended September 30, 2018 is as follows (in thousands): As of December 31, 2017 $ 17,586 Liabilities incurred (1) 9,818 Liabilities settled (1,429 ) Disposition of properties (351 ) Accretion expense 922 Revisions to estimate 1,847 As of September 30, 2018 $ 28,393 Less: Current asset retirement obligations 1,357 Long-term asset retirement obligations $ 27,036 (1) Includes $7.4 million associated with properties acquired in the Merger during the nine months ended September 30, 2018 . See Note 4 for additional information regarding this Merger.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Nonrecurring	Information about impaired assets is as follows: Level 1 Level 2 Level 3 Net Book (1) Impairment (in thousands) As of September 30, 2018 Oil and gas properties $ — $ — $ — $ — $ — As of December 31, 2017 Uinta Basin oil and gas properties (2) — — 106,587 144,532 37,945 DJ Basin unproved properties (3) — — 18,832 20,887 2,055 Piceance Basin unproved properties (4) — — — 9,098 9,098 (1) Amount represents net book value at the date of assessment. (2) The Company recognized a non-cash impairment charge of $37.9 million associated with the Company's Uinta Oil Program proved properties during the year ended December 31, 2017. The properties were sold on December 29, 2017. (3) As a result of having no future plans to develop certain acreage and/or estimated market values below carrying value, the Company recognized non-cash impairment charges of $2.1 million associated with certain non-core unproved properties in the DJ Basin during the year ended December 31, 2017 . (4) As a result of having no future plans to develop certain acreage and/or estimated market values below carrying value, the Company recognized non-cash impairment charges of $9.1 million associated with certain unproved properties in the Cottonwood Gulch area of the Piceance Basin during the year ended December 31, 2017 .
Fair Value, Balance Sheet Grouping	The following tables set forth by level within the fair value hierarchy the Company's non-financial assets and liabilities that were measured at fair value on a recurring basis in the Unaudited Consolidated Balance Sheets. Level 1 Level 2 Level 3 Total (in thousands) As of September 30, 2018 Financial Assets Cash equivalents $ 63,189 $ — $ — $ 63,189 Deferred compensation plan 1,516 — — 1,516 Commodity derivatives — 1,222 — 1,222 Financial Liabilities Commodity derivatives — 119,242 — 119,242 As of December 31, 2017 Financial Assets Cash equivalents 271,027 — — 271,027 Deferred compensation plan 1,749 — — 1,749 Commodity derivatives — 656 — 656 Financial Liabilities Commodity derivatives — 25,714 — 25,714

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair Value Amounts of Derivative Instruments	The following table summarizes the location, as well as the gross and net fair value amounts, of all derivative instruments presented on the Unaudited Consolidated Balance Sheets as of the dates indicated. As of September 30, 2018 Balance Sheet Gross Amounts of Gross Amounts Net Amounts of (in thousands) Derivative assets $ 642 $ (642 ) (1) $ — Deferred financing costs and other noncurrent assets 580 (580 ) (1) — Total derivative assets $ 1,222 $ (1,222 ) $ — Gross Amounts of Gross Amounts Net Amounts of (in thousands) Derivative liabilities $ (88,112 ) $ 642 (1) $ (87,470 ) Derivatives and other noncurrent liabilities (31,130 ) 580 (1) (30,550 ) Total derivative liabilities $ (119,242 ) $ 1,222 $ (118,020 ) As of December 31, 2017 Balance Sheet Gross Amounts of Gross Amounts Net Amounts of (in thousands) Derivative assets $ 594 $ (594 ) (1) $ — Deferred financing costs and other noncurrent assets 62 (62 ) (1) — Total derivative assets $ 656 $ (656 ) $ — Gross Amounts of Gross Amounts Net Amounts of (in thousands) Derivative liabilities $ (21,534 ) $ 594 (1) $ (20,940 ) Derivatives and other noncurrent liabilities (4,180 ) 62 (1) (4,118 ) Total derivative liabilities $ (25,714 ) $ 656 $ (25,058 ) (1) Asset and liability balances with the same counterparty are presented as a net asset or liability on the Unaudited Consolidated Balance Sheets.
Financial Instruments for Hedging Volumes	As of September 30, 2018 , the Company had swap contracts in place to hedge the following volumes for the periods indicated: October – December 2018 For the year 2019 For the year 2020 Derivative Weighted Average Price Derivative Volumes Weighted Average Price Derivative Volumes Weighted Average Price Oil (Bbls) 1,270,140 $ 54.63 6,704,184 $ 58.85 2,286,000 $ 61.32 Natural Gas (MMbtu) 460,000 $ 2.68 1,825,000 $ 2.05 — $ —
Cashless Collars
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Financial Instruments for Hedging Volumes	As of September 30, 2018 , the Company had cashless collars (purchased put options and written call options) in place to hedge the following volumes for the periods indicated: October – December 2018 For the year 2019 Derivative Weighted Average Floor Price Weighted Average Ceiling Price Derivative Weighted Average Floor Price Weighted Average Ceiling Price Oil (Bbls) 184,000 $ 60.00 $ 77.27 552,000 $ 55.00 $ 77.56

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Components of Deferred Tax Assets and Deferred Tax Liabilities	The tax effects of temporary differences that give rise to significant components of the deferred tax assets and deferred tax liabilities as of September 30, 2018 and December 31, 2017 are presented below: As of September 30, 2018 As of December 31, 2017 (in thousands) Deferred tax assets: Net operating loss carryforward $ 115,423 $ 170,536 Stock-based compensation 3,507 3,826 Deferred rent 101 163 Deferred compensation 988 1,824 State tax credit carryforwards — 6,499 Financing obligation 620 705 Accrued expenses 583 248 Investment in partnership 1,255 — Derivative instruments 29,075 6,158 Other assets 2,276 228 Less: Valuation allowance (69,980 ) (114,530 ) Total deferred tax assets 83,848 75,657 Deferred tax liabilities: Oil and gas properties (220,759 ) (75,409 ) Prepaid expenses (200 ) (248 ) Total deferred tax assets (liabilities) (220,959 ) (75,657 ) Net deferred tax assets (liabilities) $ (137,111 ) $ —

Equity Incentive Compensation_2

Equity Incentive Compensation Plans and Other Long-term Incentive Programs (Tables)	9 Months Ended
	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-Cash Stock-Based Compensation Cost Related to Equity Awards	The following table presents the long-term equity and cash incentive compensation related to awards for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (in thousands) Nonvested common stock (1) $ 1,654 $ 1,434 $ 4,504 $ 4,437 Nonvested common stock units (1) 344 174 791 516 Nonvested performance-based shares (1) — — — 558 Nonvested performance cash units (2)(3) 257 1,073 635 (27 ) Total $ 2,255 $ 2,681 $ 5,930 $ 5,484 (1) Unrecognized compensation expense as of September 30, 2018 was $10.0 million , which related to grants of nonvested shares of common stock that are expected to be recognized over a weighted-average period of 1.9 years . (2) The nonvested performance-based cash units are accounted for as liability awards with $1.4 million in accounts payable and accrued liabilities as of December 31, 2017 and $0.9 million and $3.0 million in derivatives and other noncurrent liabilities as of September 30, 2018 and December 31, 2017 , respectively, in the Unaudited Consolidated Balance Sheets. (3) Liability awards are fair valued at each reporting date. The expense for the period will increase or decrease based on updated fair values of these awards at each reporting date.
Nonvested Equity Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Nonvested Share Activity	A summary of the Company's nonvested common stock awards for the three and nine months ended September 30, 2018 and 2017 is presented below: Three Months Ended September 30, 2018 Three Months Ended September 30, 2017 Nonvested Common Stock Awards Shares Weighted Average Shares Weighted Average Outstanding at July 1, 2,858,278 $ 5.28 1,400,260 $ 7.10 Granted 123,094 6.79 5,267 3.31 Vested (25,432 ) 7.16 (13,721 ) 15.35 Forfeited or expired (38,292 ) 5.34 (550 ) 15.15 Outstanding at September 30, 2,917,648 5.33 1,391,256 7.00 Nine Months Ended September 30, 2018 Nine Months Ended September 30, 2017 Nonvested Common Stock Awards Shares Weighted Average Shares Weighted Average Outstanding at January 1, 1,394,868 $ 7.00 1,169,099 $ 9.33 Granted 1,140,542 5.60 782,511 5.99 Modified (1) 1,146,305 4.84 — — Vested (693,364 ) 8.24 (508,613 ) 10.71 Forfeited or expired (70,703 ) 5.98 (51,741 ) 7.87 Outstanding at September 30, 2,917,648 5.33 1,391,256 7.00 (1) Due to the closing of the Merger, the 2016 and 2017 Performance Cash Programs were converted from nonvested performance-based cash units to nonvested common stock awards, resulting in an increase of nonvested common stock awards for the nine months ended September 30, 2018 .
Nonvested Performance Cash Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Nonvested Performance-based Units Activity	A summary of the Company's nonvested performance-based cash unit awards for the three and nine months ended September 30, 2018 and 2017 is presented below: Three Months Ended September 30, 2018 Three Months Ended September 30, 2017 Nonvested Performance-Based Cash Unit Awards Units Weighted Average Units Weighted Average Outstanding at July 1, 846,256 1,537,198 Granted 89,037 5,267 Forfeited or expired (16,232 ) — Outstanding at September 30, 919,061 $ 4.88 1,542,465 $ 4.29 Nine Months Ended September 30, 2018 Nine Months Ended September 30, 2017 Nonvested Performance-Based Cash Unit Awards Units Weighted Average Units Weighted Average Outstanding at January 1, 1,548,083 942,326 Granted 935,293 663,425 Performance goal adjustment (1) 11,289 — Modified (2) (1,211,478 ) — Vested (286,652 ) — Forfeited or expired (77,474 ) (63,286 ) Outstanding at September 30, 919,061 $ 4.88 1,542,465 $ 4.29 (1) The 2015 Program vested at 104.1% in excess of target level and resulted in additional units vested in March 2018. These units are included in the vested line item for the nine months ended September 30, 2018 . (2) Due to the closing of the Merger, the 2016 and 2017 Performance Cash Programs were converted from nonvested performance-based cash units to nonvested common stock awards, resulting in a decrease in nonvested performance-based cash units for the nine months ended September 30, 2018 . The 2016 Program converted based on its performance through March 19, 2018, which resulted in 89% of the units converting to nonvested common stock awards or a reduction of 65,173 units converting to nonvested common stock awards.
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Nonvested Share Activity	A summary of the Company's nonvested common stock unit awards for the three and nine months ended September 30, 2018 and 2017 is presented below: Three Months Ended September 30, 2018 Three Months Ended September 30, 2017 Nonvested Common Stock Unit Awards Units Weighted Average Units Weighted Average Outstanding at July 1, 302,417 $ 7.37 272,559 $ 6.37 Granted 18,695 4.88 3,787 4.29 Vested (18,695 ) 4.88 (3,787 ) 4.29 Outstanding at September 30, 302,417 7.37 272,559 6.37 Nine Months Ended September 30, 2018 Nine Months Ended September 30, 2017 Nonvested Common Stock Unit Awards Units Weighted Average Units Weighted Average Outstanding at January 1, 272,559 $ 6.37 147,167 $ 10.09 Granted 180,778 6.63 190,711 3.53 Vested (150,920 ) 4.66 (65,319 ) 6.49 Outstanding at September 30, 302,417 7.37 272,559 6.37

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule Of Gross Future Minimum Volume Charges [Table Text Block]	The amounts in the table below represent the Company's future minimum charges under both agreements: As of September 30, 2018 (in thousands) 2018 $ 2,737 2019 (1) 10,114 2020 2,167 2021 1,997 Thereafter — Total $ 17,015 (1) Includes $6.9 million associated with the reimbursement obligation discussed above.
Schedule of Aggregate Undiscounted Minimum Future Lease Payments	The Company has a Lease Financing Obligation with Bank of America Leasing & Capital, LLC as the lead bank as discussed in Note 5 . The aggregate undiscounted minimum future lease payments, including both principal and interest components, are presented below. The Company has elected to exercise the early buyout option pursuant to which the Company will purchase the equipment for $1.8 million on February 10, 2019. As of September 30, 2018 (in thousands) 2018 $ 134 2019 1,869 Thereafter — Total $ 2,003
Gross Future Minimum Transportation Demand and Firm Processing Charges	The amounts in the table below represent the Company's future minimum transportation charges: As of September 30, 2018 (in thousands) 2018 $ 4,572 2019 18,590 2020 18,691 2021 10,903 Thereafter — Total $ 52,756
Future Minimum Annual Payments Under Drilling, Lease and Other Agreements	Future minimum annual payments under lease and other agreements are as follows: As of September 30, 2018 (in thousands) 2018 $ 2,604 2019 4,404 2020 2,532 2021 2,821 2022 2,764 Thereafter 13,087 Total $ 28,212

Guarantor Subsidiaries (Tables)

Guarantor Subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2018
Condensed Financial Information Disclosure [Abstract]
Schedule of Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheets As of September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Assets: Cash and cash equivalents $ — $ 92,980 $ — $ 92,980 Accounts receivable, net of allowance for doubtful accounts — 68,035 — 68,035 Other current assets — 2,967 — 2,967 Property and equipment, net — 1,973,869 — 1,973,869 Intercompany receivable — — — — Investment in subsidiaries 987,797 — (987,797 ) — Noncurrent assets — 6,795 — 6,795 Total assets $ 987,797 $ 2,144,646 $ (987,797 ) $ 2,144,646 Liabilities and Stockholders' Equity: Accounts payable and other accrued liabilities $ — $ 147,590 $ — $ 147,590 Other current liabilities — 191,242 — 191,242 Long-term debt — 617,006 — 617,006 Deferred income taxes — 137,111 — 137,111 Other noncurrent liabilities — 63,900 — 63,900 Stockholders' equity 987,797 987,797 (987,797 ) 987,797 Total liabilities and stockholders' equity $ 987,797 $ 2,144,646 $ (987,797 ) $ 2,144,646 As of December 31, 2017 Parent Subsidiary Intercompany Consolidated (in thousands) Assets: Cash and cash equivalents $ 314,466 $ — $ — $ 314,466 Accounts receivable, net of allowance for doubtful accounts 51,415 — — 51,415 Other current assets 1,782 — — 1,782 Property and equipment, net 1,016,986 1,894 — 1,018,880 Intercompany receivable 854 — (854 ) — Investment in subsidiaries 1,040 — (1,040 ) — Noncurrent assets 4,163 — — 4,163 Total assets $ 1,390,706 $ 1,894 $ (1,894 ) $ 1,390,706 Liabilities and Stockholders' Equity: Accounts payable and other accrued liabilities $ 84,055 $ — $ — $ 84,055 Other current liabilities 64,879 — — 64,879 Intercompany payable — 854 (854 ) — Long-term debt 617,744 — — 617,744 Other noncurrent liabilities 25,474 — — 25,474 Stockholders' equity 598,554 1,040 (1,040 ) 598,554 Total liabilities and stockholders' equity $ 1,390,706 $ 1,894 $ (1,894 ) $ 1,390,706
Schedule of Condensed Consolidating Statements of Operations	Condensed Consolidating Statements of Operations Three Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Operating and other revenues $ — $ 131,126 $ — $ 131,126 Operating expenses — (83,172 ) — (83,172 ) General and administrative — (12,696 ) — (12,696 ) Merger transaction expense — (100 ) — (100 ) Interest expense — (13,165 ) — (13,165 ) Interest income and other income (expense) — (51,353 ) — (51,353 ) Income (loss) before income taxes and equity in earnings (loss) of subsidiaries — (29,360 ) — (29,360 ) (Provision for) benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries (29,360 ) — 29,360 — Net income (loss) $ (29,360 ) $ (29,360 ) $ 29,360 $ (29,360 ) Nine Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Operating and other revenues $ — $ 322,334 $ — $ 322,334 Operating expenses — (217,042 ) — (217,042 ) General and administrative — (34,427 ) — (34,427 ) Merger transaction expense — (6,140 ) — (6,140 ) Interest expense — (39,348 ) — (39,348 ) Interest income and other income (expense) — (126,580 ) — (126,580 ) Income (loss) before income taxes and equity in earnings (loss) of subsidiaries — (101,203 ) — (101,203 ) (Provision for) benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries (101,203 ) — 101,203 — Net income (loss) $ (101,203 ) $ (101,203 ) $ 101,203 $ (101,203 ) Three Months Ended September 30, 2017 Parent Subsidiary Intercompany Consolidated (in thousands) Operating and other revenues $ 67,697 $ 168 $ — $ 67,865 Operating expenses (58,053 ) (156 ) — (58,209 ) General and administrative (12,496 ) — — (12,496 ) Interest expense (13,926 ) — — (13,926 ) Interest income and other income (expense) (12,076 ) — — (12,076 ) Income (loss) before income taxes and equity in earnings (loss) of subsidiaries (28,854 ) 12 — (28,842 ) (Provision for) benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries 12 — (12 ) — Net income (loss) $ (28,842 ) $ 12 $ (12 ) $ (28,842 ) Nine Months Ended September 30, 2017 Parent Subsidiary Intercompany Eliminations Consolidated (in thousands) Operating and other revenues $ 169,041 $ 426 $ — $ 169,467 Operating expenses (167,363 ) (486 ) — (167,849 ) General and administrative (30,788 ) — — (30,788 ) Interest expense (44,014 ) — — (44,014 ) Interest income and other income (expense) 12,780 — — 12,780 Income (loss) before income taxes and equity in earnings (loss) of subsidiaries (60,344 ) (60 ) — (60,404 ) (Provision for) benefit from income taxes — — — — Equity in earnings (loss) of subsidiaries (60 ) — 60 — Net income (loss) $ (60,404 ) $ (60 ) $ 60 $ (60,404 )
Schedule of Condensed Consolidating Statements of Comprehensive Income (Loss)	Condensed Consolidating Statements of Comprehensive Income (Loss) Three Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Net income (loss) $ (29,360 ) $ (29,360 ) $ 29,360 $ (29,360 ) Other comprehensive loss — — — — Comprehensive income (loss) $ (29,360 ) $ (29,360 ) $ 29,360 $ (29,360 ) Nine Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Net income (loss) $ (101,203 ) $ (101,203 ) $ 101,203 $ (101,203 ) Other comprehensive loss — — — — Comprehensive income (loss) $ (101,203 ) $ (101,203 ) $ 101,203 $ (101,203 ) Three Months Ended September 30, 2017 Parent Subsidiary Intercompany Eliminations Consolidated (in thousands) Net income (loss) $ (28,842 ) $ 12 $ (12 ) $ (28,842 ) Other comprehensive loss — — — — Comprehensive income (loss) $ (28,842 ) $ 12 $ (12 ) $ (28,842 ) Nine Months Ended September 30, 2017 Parent Subsidiary Intercompany Consolidated (in thousands) Net income (loss) $ (60,404 ) $ (60 ) $ 60 $ (60,404 ) Other comprehensive loss — — — — Comprehensive income (loss) $ (60,404 ) $ (60 ) $ 60 $ (60,404 )
Schedule of Condensed Consolidating Statements of Cash Flows	Condensed Consolidating Statements of Cash Flows Nine Months Ended September 30, 2018 Parent Subsidiary Intercompany Consolidated (in thousands) Cash flows from operating activities $ — $ 160,185 $ — $ 160,185 Cash flows from investing activities: Additions to oil and gas properties, including acquisitions — (322,614 ) — (322,614 ) Additions to furniture, fixtures and other — (616 ) — (616 ) Repayment of debt associated with merger, net of cash acquired — (53,357 ) — (53,357 ) Proceeds from sale of properties and other investing activities — 11 — 11 Intercompany transfers — — — — Cash flows from financing activities: Principal payments on debt — (350 ) — (350 ) Proceeds from sale of common stock, net of offering costs — 1 — 1 Intercompany transfers — — — — Other financing activities — (4,746 ) — (4,746 ) Change in cash and cash equivalents — (221,486 ) — (221,486 ) Beginning cash and cash equivalents — 314,466 — 314,466 Ending cash and cash equivalents $ — $ 92,980 $ — $ 92,980 Nine Months Ended September 30, 2017 Parent Subsidiary Intercompany Consolidated (in thousands) Cash flows from operating activities $ 95,009 $ 374 $ — $ 95,383 Cash flows from investing activities: Additions to oil and gas properties, including acquisitions (160,788 ) — — (160,788 ) Additions to furniture, fixtures and other (268 ) — — (268 ) Proceeds from sale of properties and other investing activities (712 ) — — (712 ) Intercompany transfers 374 — (374 ) — Cash flows from financing activities: Proceeds from debt 275,000 — — 275,000 Principal payments on debt (322,228 ) — — (322,228 ) Proceeds from sale of common stock, net of offering costs (298 ) — — (298 ) Intercompany transfers — (374 ) 374 — Other financing activities (6,045 ) — — (6,045 ) Change in cash and cash equivalents (119,956 ) — — (119,956 ) Beginning cash and cash equivalents 275,841 — — 275,841 Ending cash and cash equivalents $ 155,885 $ — $ — $ 155,885

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (5)	$ (203)
Accounts receivable	68,035	51,415
Accrued Oil, Gas, and NGL Sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	51,405	36,569
Due from Joint Interest Owners
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	16,607	14,779
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable gross	$ 28	$ 270

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Net Capitalized Costs and Associated Accumulated Depreciation, Depletion & Amortization and Non Cash Impairments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Proved properties	$ 427,982	$ 230,800
Wells and related equipment and facilities	1,370,616	1,088,692
Support equipment and facilities	64,324	38,776
Materials and supplies	13,742	2,900
Total proved oil and gas properties	1,876,664	1,361,168
Unproved properties	549,342	18,832
Wells and facilities in progress	108,199	65,844
Total unproved oil and gas properties, excluded from amortization	657,541	84,676
Accumulated depreciation, depletion, amortization and impairment	(567,156)	(433,234)
Total oil and gas properties, net (1)	1,967,049	$ 1,012,610
Fifth Creek [Member]
Business Acquisition [Line Items]
Total oil and gas properties, net (1)	$ 722,000

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Non-Cash Impairment Charges, Included within Impairment, Dry Hole Costs and Abandonment Expense in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Summary Of Significant Accounting Policies [Line Items]
Impairment of Oil and Gas Properties			$ 0
Abandonment expense and lease expirations	$ 184	$ 261	609	$ 326
Impairment, dry hole costs and abandonment expense	184	261	609	8,336
Unproved Oil And Gas Properties
Summary Of Significant Accounting Policies [Line Items]
Impairment of Oil and Gas Properties	$ 0	$ 0	$ 0	$ 8,010

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Accrued drilling, completion and facility costs (1)	$ 97,634	$ 35,856
Accrued lease operating, gathering, transportation and processing expenses	7,104	4,360
Accrued general and administrative expenses	8,248	11,134
Accrued interest payable	18,355	6,484
Accrued merger transaction expenses	174	8,278
Accrued hedge settlements	6,411	65
Prepayments from partners	937	2,524
Trade payables	5,341	10,067
Other	3,386	5,287
Total accounts payable and other accrued liabilities	$ 147,590	$ 84,055

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Revenue Recognition (Details)	9 Months Ended
	Sep. 30, 2018
Revenue from External Customer [Line Items]
Contract payment term	1 month
Minimum
Revenue from External Customer [Line Items]
Revenue contract term	1 month
Maximum
Revenue from External Customer [Line Items]
Revenue contract term	19 years

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Calculation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accounting Policies [Abstract]
Net Income (Loss)	$ (29,360)	$ (28,842)	$ (101,203)	$ (60,404)	$ (138,225)
Basic weighted-average common shares outstanding in period (in shares)	209,501,887	74,886,107	181,144,822	74,742,699
Diluted weighted-average common shares outstanding in period (in shares)	209,501,887	74,886,107	181,144,822	74,742,699
Net Income (Loss) Per Common Share, Basic (in dollars per share)	$ (0.14)	$ (0.39)	$ (0.56)	$ (0.81)
Net Income (Loss) Per Common Share, Diluted (in dollars per share)	$ (0.14)	$ (0.39)	$ (0.56)	$ (0.81)

Supplemental Disclosures of C_3

Supplemental Disclosures of Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 25,746	$ 31,113
Cash paid for income taxes	0	0
Supplemental disclosures of non-cash investing and financing activities:
Accrued liabilities - oil and gas properties	101,838	37,319
Accrued liabilities, financing costs	215	0
Change in asset retirement obligations, net of disposals	9,885	10,453
Retirement of treasury stock	(1,533)	(1,246)
Properties exchanged in non-cash transactions	0	13,323
Issuance of common stock for Merger	$ 484,000	$ 0

Mergers - Additional Informatio

Mergers - Additional Information (Detail) $ in Thousands	Mar. 19, 2018USD ($)awellshares	Sep. 30, 2018USD ($)MMBoe	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)MMBoe	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)MMBoe
Business Acquisition [Line Items]
Merger transaction expense		$ 100	$ 0	$ 6,140	$ 0	$ 14,900
Fifth Creek [Member]
Business Acquisition [Line Items]
Net acreage acquired | a	81,000
Productive standard-length wells acquired | well	62
Productive extended reach wells acquired | well	10
Additional net proved reserves | MMBoe		9.3		9.3		9.3
Additional net proved developed reserves | MMBoe		4.7		4.7		4.7
Additional net proved undeveloped reserves | MMBoe		4.6		4.6		4.6
Common shares issued to effect the merger (shares) | shares	100,000,000
Fair value of common stock issued	$ 484,000
Repayment of Fifth Creek debt	$ 53,900
Revenue generated from acquired assets since acquisition date		$ 20,900		$ 35,200
Expenses incurred from acquired assets since acquisition date		13,700		25,100
Merger-related costs adjustment
Business Acquisition [Line Items]
Merger transaction expense		100		6,100
Fifth Creek [Member] | Merger-related costs adjustment
Business Acquisition [Line Items]
Merger transaction expense		$ 0		$ 4,000

Mergers - Assets and Liabilitie

Mergers - Assets and Liabilities Acquired (Detail) - Fifth Creek [Member] $ in Thousands	Mar. 19, 2018USD ($)
Purchase Price:
Fair value of common stock issued	$ 484,000
Plus: Repayment of Fifth Creek debt	53,900
Total purchase price	537,900
Plus Liabilities Assumed:
Accounts payable and accrued liabilities	25,782
Current unfavorable contract	2,651
Other current liabilities	13,797
Asset retirement obligations	7,361
Long-term deferred tax liability	137,111
Long-term unfavorable contract	4,449
Other noncurrent liabilities	2,354
Total purchase price plus liabilities assumed	731,405
Fair Value of Assets Acquired:
Cash	543
Accounts receivable	7,831
Proved oil and gas properties	105,702
Unproved oil and gas properties	608,972
Asset Retirement Obligations	7,361
Furniture, equipment and other	931
Other noncurrent assets	65
Total asset value	$ 731,405

Mergers - Proforma Information

Mergers - Proforma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018
Pro Forma Financial Information
Revenues	$ 131,126	$ 80,973	$ 338,266	$ 195,727
Net Income (Loss) and Comprehensive Income (Loss)	$ (29,260)	$ (33,301)	$ (98,993)	$ (65,180)
Net Income (Loss) per Common Share, Basic (in dollars per share)	$ (0.14)	$ (0.19)	$ (0.47)	$ (0.37)
Net Income (Loss) per Common Share, Diluted (in dollars per share)	$ (0.14)	$ (0.19)	$ (0.47)	$ (0.37)
Pro Forma Financial Information
Merger transaction expense	$ 100	$ 0	$ 6,140	$ 0	$ 14,900
Merger-related costs adjustment
Pro Forma Financial Information
Merger transaction expense	100		6,100
Merger-related costs adjustment | Fifth Creek [Member]
Pro Forma Financial Information
Merger transaction expense	$ 0		$ 4,000

Long-Term Debt - Outstanding De

Long-Term Debt - Outstanding Debt (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal amount of debt instrument	$ 625,000,000	$ 626,859,000
Unamortized Debt Issuance Expense	(7,994,000)	(9,115,000)
Carrying Amount	617,006,000	617,744,000
Debt, fair value	$ 638,800,000	661,400,000
Amended Credit Facility
Debt Instrument [Line Items]
Maturity Date	Sep. 14, 2023
Principal amount of debt instrument	$ 0	0
Unamortized Debt Issuance Expense	0	0
Carrying Amount	0	0
Debt, fair value	$ 0
7.0% Senior Notes
Debt Instrument [Line Items]
Maturity Date	Oct. 15, 2022
Principal amount of debt instrument	$ 350,000,000	350,000,000
Unamortized Debt Issuance Expense	(3,419,000)	(4,033,000)
Carrying Amount	$ 346,581,000	345,967,000
Debt, stated interest rate	7.00%
Debt, fair value	$ 348,600,000	356,100,000
8.75% Senior Notes
Debt Instrument [Line Items]
Maturity Date	Jun. 15, 2025
Principal amount of debt instrument	$ 275,000,000	275,000,000
Unamortized Debt Issuance Expense	(4,575,000)	(5,080,000)
Carrying Amount	$ 270,425,000	269,920,000
Debt, stated interest rate	8.75%
Debt, fair value	$ 290,200,000	305,300,000
Lease Financing Obligation
Debt Instrument [Line Items]
Maturity Date	Aug. 10, 2020
Principal amount of debt instrument	$ 1,978,000	2,328,000
Unamortized Debt Issuance Expense	0	(2,000)
Carrying Amount	1,978,000	2,326,000
Debt, fair value	1,800,000	2,100,000
Long-term Debt
Debt Instrument [Line Items]
Principal amount of debt instrument	626,978,000	627,328,000
Unamortized Debt Issuance Expense	(7,994,000)	(9,115,000)
Carrying Amount	618,984,000	618,213,000
Current Portion of Long-Term Debt
Debt Instrument [Line Items]
Principal amount of debt instrument	1,978,000	469,000
Unamortized Debt Issuance Expense	0	0
Carrying Amount	$ 1,978,000	$ 469,000

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (257,000)	$ 0	$ (257,000)	$ (7,904,000)
Principal amount	625,000,000		625,000,000		$ 626,859,000
Debt, fair value	638,800,000		638,800,000		661,400,000
Purchase of equipment	1,800,000		1,800,000
Maximum Credit Amount, Maximum Commitments That Could Be Elected By Lenders	$ 1,500,000,000		$ 1,500,000,000
Minimum
Debt Instrument [Line Items]
Revolving credit facility interest rate percent above LIBOR alternate interest rate			0.50%
Commitment fee percentage	0.375%		0.375%
Revolving Credit Facility Interest Rate Percent Above Libor			1.50%
Maximum
Debt Instrument [Line Items]
Revolving credit facility interest rate percent above LIBOR alternate interest rate			1.50%
Commitment fee percentage	0.50%		0.50%
Revolving Credit Facility Interest Rate Percent Above Libor			2.50%
Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, maturity date			Sep. 14, 2023
Line of credit facility, maximum borrowing capacity	$ 500,000,000		$ 500,000,000
Letters of credit issued amount	26,000,000		26,000,000
Line of credit facility, remaining borrowing capacity	474,000,000		474,000,000
Principal amount	0		0		0
Debt, fair value	0		$ 0
7.0% Senior Notes
Debt Instrument [Line Items]
Debt instrument, maturity date			Oct. 15, 2022
Principal amount	$ 350,000,000		$ 350,000,000		350,000,000
Debt, stated interest rate	7.00%		7.00%
Debt, fair value	$ 348,600,000		$ 348,600,000		356,100,000
8.75% Senior Notes
Debt Instrument [Line Items]
Debt instrument, maturity date			Jun. 15, 2025
Principal amount	$ 275,000,000		$ 275,000,000		275,000,000
Debt, stated interest rate	8.75%		8.75%
Debt, fair value	$ 290,200,000		$ 290,200,000		305,300,000
Lease Financing Obligation
Debt Instrument [Line Items]
Debt instrument, maturity date			Aug. 10, 2020
Principal amount	1,978,000		$ 1,978,000		2,328,000
Debt, fair value	$ 1,800,000		$ 1,800,000		$ 2,100,000
Weighted average implicit rate based on interest expense	3.30%		3.30%
2018 [Member] | 7.0% Senior Notes
Debt Instrument [Line Items]
Par value of senior notes			102.333%
2019 [Member] | 7.0% Senior Notes
Debt Instrument [Line Items]
Par value of senior notes			101.167%
2020 [Member] | 7.0% Senior Notes
Debt Instrument [Line Items]
Par value of senior notes			100.00%
2020 [Member] | 8.75% Senior Notes
Debt Instrument [Line Items]
Par value of senior notes			106.563%
2021 [Member] | 8.75% Senior Notes
Debt Instrument [Line Items]
Par value of senior notes			104.375%
2022 [Member] | 8.75% Senior Notes
Debt Instrument [Line Items]
Par value of senior notes			102.188%
2023 [Member] | 8.75% Senior Notes
Debt Instrument [Line Items]
Par value of senior notes			100.00%
Prior to June 15, 2020 [Member] | 8.75% Senior Notes
Debt Instrument [Line Items]
Par value of senior notes			100.00%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed			35.00%
Redemption Price As Percentage Of Principal Redeemed If Equity Offering Proceeds Used			108.75%

Asset Retirement Obligations -

Asset Retirement Obligations - Schedule of Asset Retirement Obligations (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
As of December 31, 2017	$ 17,586
Liabilities incurred	9,818
Liabilities settled	(1,429)
Disposition of properties	(351)
Accretion expense	922
Revisions to estimate	1,847
As of September 30, 2018	28,393
Less: Current asset retirement obligations	1,357
Long-term asset retirement obligations	$ 27,036

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value, Balance Sheet Grouping (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Financial Assets
Cash equivalents	$ 92,980	$ 314,466	$ 155,885	$ 275,841
Commodity derivatives	0	0
Financial Liabilities
Commodity derivatives	118,020	25,058
Total
Financial Assets
Cash equivalents	63,189	271,027
Deferred compensation plan	1,516	1,749
Commodity derivatives	1,222	656
Financial Liabilities
Commodity derivatives	119,242	25,714
Level 1
Financial Assets
Cash equivalents	63,189	271,027
Deferred compensation plan	1,516	1,749
Commodity derivatives	0	0
Financial Liabilities
Commodity derivatives	0	0
Level 2
Financial Assets
Cash equivalents	0	0
Deferred compensation plan	0	0
Commodity derivatives	1,222	656
Financial Liabilities
Commodity derivatives	119,242	25,714
Level 3
Financial Assets
Cash equivalents	0	0
Deferred compensation plan	0	0
Commodity derivatives	0	0
Financial Liabilities
Commodity derivatives	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value Measurements [Line Items]
Unproved Oil and Gas Property, Successful Effort Method	$ 657,541,000		$ 657,541,000		$ 84,676,000
Debt, fair value	$ 638,800,000		638,800,000		661,400,000
Impairment of Oil and Gas Properties			$ 0
7.0% Senior Notes
Fair Value Measurements [Line Items]
Debt, stated interest rate	7.00%		7.00%
Debt, fair value	$ 348,600,000		$ 348,600,000		356,100,000
8.75% Senior Notes
Fair Value Measurements [Line Items]
Debt, stated interest rate	8.75%		8.75%
Debt, fair value	$ 290,200,000		$ 290,200,000		305,300,000
Amended Credit Facility
Fair Value Measurements [Line Items]
Debt, fair value	0		0
Lease Financing Obligation
Fair Value Measurements [Line Items]
Debt, fair value	1,800,000		1,800,000		2,100,000
Uinta Basin [Member]
Fair Value Measurements [Line Items]
Impairment of Oil and Gas Properties					37,945,000
DJ Basin, non-core [Member]
Fair Value Measurements [Line Items]
Impairment of Oil and Gas Properties					2,100,000
Unproved Oil And Gas Properties
Fair Value Measurements [Line Items]
Impairment of Oil and Gas Properties	$ 0	$ 0	$ 0	$ 8,010,000
Piceance [Member]
Fair Value Measurements [Line Items]
Impairment of Oil and Gas Properties					$ 9,100,000

Fair Value Measurements Nonrecu

Fair Value Measurements Nonrecurring (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Book Value Prior To Impairment	$ 0
Impairment of Oil and Gas Properties	0
Fair Value, Measurements, Nonrecurring [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net	0
Fair Value, Measurements, Nonrecurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net	$ 0
Uinta Basin [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Book Value Prior To Impairment		$ 144,532
Impairment of Oil and Gas Properties		37,945
Uinta Basin [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		0
Uinta Basin [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		0
Uinta Basin [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		106,587
DJ Basin, Unproved [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Book Value Prior To Impairment		20,887
Impairment of Oil and Gas Properties		2,055
DJ Basin, Unproved [Domain] | Fair Value, Measurements, Nonrecurring [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		0
DJ Basin, Unproved [Domain] | Fair Value, Measurements, Nonrecurring [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		0
DJ Basin, Unproved [Domain] | Fair Value, Measurements, Nonrecurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		18,832
Piceance Basin, Unproved [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Book Value Prior To Impairment		9,098
Impairment of Oil and Gas Properties		9,098
Piceance Basin, Unproved [Domain] | Fair Value, Measurements, Nonrecurring [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		0
Piceance Basin, Unproved [Domain] | Fair Value, Measurements, Nonrecurring [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		0
Piceance Basin, Unproved [Domain] | Fair Value, Measurements, Nonrecurring [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Oil and Gas Property, Successful Effort Method, Net		$ 0

Derivative Instruments - Fair V

Derivative Instruments - Fair Value Amounts of Derivative Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	$ 1,222	$ 656
Gross Amounts Offset in the Balance Sheet	(1,222)	(656)
Net Amounts of Assets Presented in the Balance Sheet	0	0
Gross Amounts of Recognized Liabilities	(119,242)	(25,714)
Gross Amounts Offset in the Balance Sheet	1,222	656
Net Amounts of Liabilities Presented in the Balance Sheet	(118,020)	(25,058)
Derivative assets
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	642	594
Gross Amounts Offset in the Balance Sheet	(642)	(594)
Net Amounts of Assets Presented in the Balance Sheet	0	0
Deferred financing costs and other noncurrent assets
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets	580	62
Gross Amounts Offset in the Balance Sheet	(580)	(62)
Net Amounts of Assets Presented in the Balance Sheet	0	0
Derivative liabilities
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities	(88,112)	(21,534)
Gross Amounts Offset in the Balance Sheet	642	594
Net Amounts of Liabilities Presented in the Balance Sheet	(87,470)	(20,940)
Derivatives and other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities	(31,130)	(4,180)
Gross Amounts Offset in the Balance Sheet	580	62
Net Amounts of Liabilities Presented in the Balance Sheet	$ (30,550)	$ (4,118)

Derivative Instruments - Financ

Derivative Instruments - Financial Instruments for Hedging Volume (Detail)	Sep. 30, 2018MMBTU$ / unitbbl
October – December 2018 | Swap contracts | Oil (Bbls)
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	1,270,140
Weighted Average Price (usd per unit)	54.63
October – December 2018 | Swap contracts | Natural Gas (MMbtu)
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed natural gas volume | MMBTU	460,000
Weighted Average Price (usd per unit)	2.68
October – December 2018 | Cashless Collars | Oil (Bbls)
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	184,000
Weighted Average Floor Price (usd per unit)	60
Weighted Average Ceiling Price (usd per unit)	77.27
For the year 2019 | Swap contracts | Oil (Bbls)
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	6,704,184
Weighted Average Price (usd per unit)	58.85
For the year 2019 | Swap contracts | Natural Gas (MMbtu)
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed natural gas volume | MMBTU	1,825,000
Weighted Average Price (usd per unit)	2.05
For the year 2019 | Cashless Collars | Oil (Bbls)
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	552,000
Weighted Average Floor Price (usd per unit)	55
Weighted Average Ceiling Price (usd per unit)	77.56
For the year 2020 | Swap contracts | Oil (Bbls)
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	2,286,000
Weighted Average Price (usd per unit)	61.32
For the year 2020 | Swap contracts | Natural Gas (MMbtu)
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed natural gas volume | MMBTU	0
Weighted Average Price (usd per unit)	0

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018counterparty
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of counterparties for hedges at period end	8

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforward, Annual limitation	$ 11,700
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	64,500
Deferred income tax asset (liability)	137,111	$ 0
Operating Loss Carryforwards	468,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 468,400
U.S. federal income tax rate	21.00%	35.00%
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Decrease in Operating Loss Carryforward	$ 274,600
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Decrease in Operating Loss Carryforward	10,000
Decrease in Tax Credit Carryforward	$ 8,200

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Components of Deferred Tax Assets and Liabilities [Abstract]
Net operating loss carryforward	$ 115,423	$ 170,536
Stock-based compensation	3,507	3,826
Deferred rent	101	163
Deferred compensation	988	1,824
State tax credit carryforwards	0	6,499
Financing obligation	620	705
Accrued expenses	583	248
Investment in partnership	1,255	0
Derivative instruments	29,075	6,158
Other assets	2,276	228
Less: Valuation allowance	(69,980)	(114,530)
Total deferred tax assets	83,848	75,657
Oil and gas properties	(220,759)	(75,409)
Prepaid expenses	(200)	(248)
Total deferred tax assets (liabilities)	(220,959)	(75,657)
Net deferred tax assets (liabilities)	$ (137,111)	$ 0

Stockholders' Equity (Detail)

Stockholders' Equity (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	75,000,000		75,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001		$ 0.001			$ 0.001
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001		$ 0.001
Common Stock, Shares Authorized	400,000,000		400,000,000			300,000,000
Preferred stock, shares issued (in shares)	0		0
Preferred stock, shares outstanding (in shares)	0		0
Common Stock, Shares, Issued	212,445,188		212,445,188			110,363,539
7.0% Senior Notes
Class of Stock [Line Items]
Debt, stated interest rate	7.00%		7.00%
Nonvested Equity Shares [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	2,917,648	1,391,256	2,917,648	1,391,256	2,858,278	1,394,868	1,400,260	1,169,099
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 5.33	$ 7	$ 5.33	$ 7	$ 5.28	$ 7	$ 7.10	$ 9.33
Total shares granted (in shares)	123,094	5,267	1,140,542	782,511
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 6.79	$ 3.31	$ 5.60	$ 5.99
Share-based Compensation Arrangement by Share-based Payment Award, Shares Modified in Period			1,146,305	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modified Shares in Period, Weighted Average Grant Date Fair Value (in dollars per share)			$ 4.84	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	(25,432)	(13,721)	(693,364)	(508,613)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 7.16	$ 15.35	$ 8.24	$ 10.71
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	(38,292)	(550)	(70,703)	(51,741)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share)	$ 5.34	$ 15.15	$ 5.98	$ 7.87
Merger [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued	100,000,000		100,000,000

Equity Incentive Compensation_3

Equity Incentive Compensation Plans and Other Long-term Incentive Programs - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)$ / sharesshares	Sep. 30, 2017shares	Sep. 30, 2018USD ($)integerunit$ / sharesshares	Sep. 30, 2017shares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2015unit
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Derivatives and other noncurrent liabilities	$ (36,864)		$ (36,864)		$ (9,377)
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.001		$ 0.001
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.001		$ 0.001		$ 0.001
Unrecognized compensation cost	$ 10,000		$ 10,000
Weighted-average period (years)			1 year 10 months 24 days
Nonvested Equity Shares
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting period			3 years
Total shares granted (in shares) | shares	123,094	5,267	1,140,542	782,511
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) | shares	25,432	13,721	693,364	508,613
Nonvested Equity Common Stock Units
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting period			1 year
Cash-Based Award
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting period			3 years
Nonvested Performance Cash Units
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred Compensation Cash-based Arrangements, Liability, Current					$ 1,400
Deferred Compensation Cash-based Arrangements, Liability, Classified, Noncurrent	$ 900		$ 900		$ 3,000
Total shares granted (in shares) | shares	89,037	5,267	935,293	663,425
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) | shares			286,652	0
Performance Shares
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting period			3 years
Two Thousand And Seventeen Performance Program [Domain]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Derivatives and other noncurrent liabilities	$ 900		$ 900
Percentage Of Original Award Converted To Nonvested Common Stock Award			100.00%
Number Of Units Converted To Nonvested Common Stock | integer			619,006
Number Of Shares, Converted From Performance Cash Units | shares			619,006
Adjustments to Additional Paid in Capital, Other			$ 900
Two Thousand And Sixteen Performance Program [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Derivatives and other noncurrent liabilities	$ 1,800		$ 1,800
Percentage Of Original Award Converted To Nonvested Common Stock Award			89.00%
Number Of Units Not Converted To Nonvested Common Stock | integer			65,173
Number Of Units Converted To Nonvested Common Stock | integer			592,472
Number Of Shares, Converted From Performance Cash Units | shares			527,299
Adjustments to Additional Paid in Capital, Other			$ 1,800
Two Thousand And Fifteen Performance Program [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Number Of Performance Cash Units Granted (in shares) | unit						422,345
Weighted Percentage Of Stockholders Return Related To Performance Goals			60.00%
Performance Goals Percentage for Change In Discretionary Cash Flow Per Debt Adjusted Share Relative To Defined Peer Groups Percentage			40.00%
Maximum Number Of Cash Units Vest As Percentage Of Performance Cash Units Granted			200.00%
Percent of Performance Based Shares Vested					104.10%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) | shares					286,652
Two Thousand And Fifteen Performance Program [Member] | Minimum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Percentage Of Grant That Will Vest For Performance Met At Threshold Level	25.00%		25.00%
Two Thousand And Fifteen Performance Program [Member] | Maximum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Percentage Of Grant That Will Vest For Performance Met At Threshold Level	50.00%		50.00%
Percentage Of Grant That Will Vest For Metrics Met At Target Level	100.00%		100.00%
Percentage Of Grant That Will Vest For Metrics Met At Stretch Level			200.00%
Two Thousand Eighteen Performance Program [Domain]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cash program vesting period			3 years
Closing Share Price (in dollars per share) | $ / shares	$ 5.13		$ 5.13
Payout If Share Price Less Than $5.13 | unit			0
One Percent Vest For Each One Percent Growth			1.00%
Payout If Relative TSR Is Less Than Median | unit			0
Two Thousand Eighteen Performance Program [Domain] | Absolute Performance
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting rights, percentage			150.00%
Two Thousand Eighteen Performance Program [Domain] | Relative TSR
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting rights, percentage			50.00%
Two Thousand Eighteen Performance Program [Domain] | Absolute Performance and Relative TSR | Maximum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting rights, percentage			200.00%

Equity Incentive Compensation_4

Equity Incentive Compensation Plans and Other Long-term Incentive Programs - Non-Cash Stock-Based Compensation Cost Related to Equity Awards (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	$ 2,255	$ 2,681	$ 5,930	$ 5,484
Nonvested Equity Shares [Member]
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	1,654	1,434	4,504	4,437
Nonvested Equity Common Stock Units
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	344	174	791	516
Nonvested Performance-Based Equity
Stock Based Compensation [Line Items]
Non-cash stock-based compensation equity awards	0	0	0	558
Nonvested Performance Cash Units
Stock Based Compensation [Line Items]
Cash Unit Based Compensation Awards	$ 257	$ 1,073	$ 635	$ (27)

Equity Incentive Compensation_5

Equity Incentive Compensation Plans and Other Long-term Incentive Programs - Stock Options and Nonvested Equity Shares, Equity Awards Granted (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Nonvested Equity Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	2,917,648	1,391,256	2,917,648	1,391,256	2,858,278	1,394,868	1,400,260	1,169,099
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	(25,432)	(13,721)	(693,364)	(508,613)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 7.16	$ 15.35	$ 8.24	$ 10.71
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	(38,292)	(550)	(70,703)	(51,741)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share)	$ 5.34	$ 15.15	$ 5.98	$ 7.87
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 5.33	$ 7	$ 5.33	$ 7	$ 5.28	$ 7	$ 7.10	$ 9.33
Total shares granted (in shares)	123,094	5,267	1,140,542	782,511
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 6.79	$ 3.31	$ 5.60	$ 5.99
Share-based Compensation Arrangement by Share-based Payment Award, Shares Modified in Period			1,146,305	0
Nonvested Performance Cash Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	919,061	1,542,465	919,061	1,542,465	846,256	1,548,083	1,537,198	942,326
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)			(286,652)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)	(16,232)	0	(77,474)	(63,286)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 4.88	$ 4.29	$ 4.88	$ 4.29
Total shares granted (in shares)	89,037	5,267	935,293	663,425
Share-Based Compensation, Performance Goal Adjustment (in shares)			11,289	0
Share Based Compensation, Modification (in shares)			(1,211,478)	0
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)	302,417	272,559	302,417	272,559	302,417	272,559	272,559	147,167
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	(18,695)	(3,787)	(150,920)	(65,319)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 4.88	$ 4.29	$ 4.66	$ 6.49
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 7.37	$ 6.37	$ 7.37	$ 6.37	$ 7.37	$ 6.37	$ 6.37	$ 10.09
Total shares granted (in shares)	18,695	3,787	180,778	190,711
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 4.88	$ 4.29	$ 6.63	$ 3.53

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Aggregate Undiscounted Minimum Future Lease Payments (Detail) - Lease Financing Obligation $ in Thousands	Sep. 30, 2018USD ($)
Future Minimum Lease Payments Under Capital Leases And Operating Leases For Continuing Operations [Line Items]
2,018	$ 134
2,019	1,869
Thereafter	0
Total	$ 2,003

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)integeragreement	Sep. 30, 2017USD ($)
Contingencies And Commitments [Line Items]
Reimbursement Obligation To Construct Gas Gathering And Processing Facilities	$ 6.9		$ 6.9
Operating Leases, Rent Expense	0.8	$ 0.5	$ 2	$ 1.5
Minimum Volume Commitment | integer			3
Sale Leaseback Transaction Early Buyout Option To Purchase Equipment	$ 1.8		$ 1.8
Number of Firm Transportation Contracts | agreement			2
Number Of GTP Reimbursement Obligations | integer			1

Commitments and Contingencies_3

Commitments and Contingencies - Gross Future Minimum Transportation Demand and Firm Processing Charges (Detail) $ in Thousands	Sep. 30, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 4,572
2,019	18,590
2,020	18,691
2,021	10,903
Thereafter	0
Total	$ 52,756

Commitments and Contingencies_4

Commitments and Contingencies - Future Minimum Annual Payments under Drilling, Lease and Other Agreements (Detail) - Office & Equipment Leases $ in Thousands	Sep. 30, 2018USD ($)
Operating Leased Assets [Line Items]
2,018	$ 2,604
2,019	4,404
2,020	2,532
2,021	2,821
2,022	2,764
Thereafter	13,087
Total	$ 28,212

Commitments and Contingencies C

Commitments and Contingencies Commitments And Contingencies - Gross Future Minimum Volume Charges (Details) $ in Thousands	Sep. 30, 2018USD ($)
Commitments and Contingencies - Gross Future Minimum Volume Charges [Abstract]
2,018	$ 2,737
2,019	10,114
2,020	2,167
2,021	1,997
Thereafter	0
Total	$ 17,015

Guarantor Subsidiaries - Additi

Guarantor Subsidiaries - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018
Condensed Financial Information Disclosure [Abstract]
Percentage of guarantor subsidiaries	100.00%

Guarantor Subsidiaries - Schedu

Guarantor Subsidiaries - Schedule of Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 92,980	$ 314,466	$ 155,885	$ 275,841
Accounts receivable, net of allowance for doubtful accounts	68,035	51,415
Other current assets	2,967	1,782
Property and equipment, net	1,973,869	1,018,880
Intercompany receivable (payable)	0	0
Investment in subsidiaries	0	0
Noncurrent assets	6,795	4,163
Total	2,144,646	1,390,706
Liabilities and Stockholders' Equity:
Accounts payable and other accrued liabilities	147,590	84,055
Other current liabilities	191,242	64,879
Intercompany payable		0
Long-term debt, net of debt issuance costs	617,006	617,744
Deferred income taxes	137,111	0
Other noncurrent liabilities	63,900	25,474
Stockholders' equity	987,797	598,554		571,543
Total liabilities and stockholders' equity	2,144,646	1,390,706
Intercompany Eliminations
Assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net of allowance for doubtful accounts	0	0
Other current assets	0	0
Property and equipment, net	0	0
Intercompany receivable (payable)	0	(854)
Investment in subsidiaries	(987,797)	(1,040)
Noncurrent assets	0	0
Total	(987,797)	(1,894)
Liabilities and Stockholders' Equity:
Accounts payable and other accrued liabilities	0	0
Other current liabilities	0	0
Intercompany payable		(854)
Long-term debt, net of debt issuance costs	0	0
Deferred income taxes	0
Other noncurrent liabilities	0	0
Stockholders' equity	(987,797)	(1,040)
Total liabilities and stockholders' equity	(987,797)	(1,894)
Parent Guarantor | Reportable Legal Entities
Assets:
Cash and cash equivalents	0	0
Accounts receivable, net of allowance for doubtful accounts	0
Other current assets	0
Property and equipment, net	0
Intercompany receivable (payable)	0
Investment in subsidiaries	987,797
Noncurrent assets	0
Total	987,797
Liabilities and Stockholders' Equity:
Accounts payable and other accrued liabilities	0
Other current liabilities	0
Long-term debt, net of debt issuance costs	0
Deferred income taxes	0
Other noncurrent liabilities	0
Stockholders' equity	987,797
Total liabilities and stockholders' equity	987,797
Parent Issuer | Reportable Legal Entities
Assets:
Cash and cash equivalents		314,466	155,885	275,841
Accounts receivable, net of allowance for doubtful accounts		51,415
Other current assets		1,782
Property and equipment, net		1,016,986
Intercompany receivable (payable)		854
Investment in subsidiaries		1,040
Noncurrent assets		4,163
Total		1,390,706
Liabilities and Stockholders' Equity:
Accounts payable and other accrued liabilities		84,055
Other current liabilities		64,879
Intercompany payable		0
Long-term debt, net of debt issuance costs		617,744
Other noncurrent liabilities		25,474
Stockholders' equity		598,554
Total liabilities and stockholders' equity		1,390,706
Subsidiary Issuer | Reportable Legal Entities
Assets:
Cash and cash equivalents	92,980	314,466
Accounts receivable, net of allowance for doubtful accounts	68,035
Other current assets	2,967
Property and equipment, net	1,973,869
Intercompany receivable (payable)	0
Investment in subsidiaries	0
Noncurrent assets	6,795
Total	2,144,646
Liabilities and Stockholders' Equity:
Accounts payable and other accrued liabilities	147,590
Other current liabilities	191,242
Long-term debt, net of debt issuance costs	617,006
Deferred income taxes	137,111
Other noncurrent liabilities	63,900
Stockholders' equity	987,797
Total liabilities and stockholders' equity	$ 2,144,646
Subsidiary Guarantors | Reportable Legal Entities
Assets:
Cash and cash equivalents		0	$ 0	$ 0
Accounts receivable, net of allowance for doubtful accounts		0
Other current assets		0
Property and equipment, net		1,894
Intercompany receivable (payable)		0
Investment in subsidiaries		0
Noncurrent assets		0
Total		1,894
Liabilities and Stockholders' Equity:
Accounts payable and other accrued liabilities		0
Other current liabilities		0
Intercompany payable		854
Long-term debt, net of debt issuance costs		0
Other noncurrent liabilities		0
Stockholders' equity		1,040
Total liabilities and stockholders' equity		$ 1,894

Guarantor Subsidiaries - Sche_2

Guarantor Subsidiaries - Schedule of Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended	21 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Operating revenues	$ 131,126	$ 67,865	$ 322,334	$ 169,467
Operating expenses	(83,172)	(58,209)	(217,042)	(167,849)
General and administrative	(12,696)	(12,496)	(34,427)	(30,788)
Merger transaction expense	(100)	0	(6,140)	0		$ (14,900)
Interest Expense	(13,165)	(13,926)	(39,348)	(44,014)
Interest income and other income (expense)	(51,353)	(12,076)	(126,580)	12,780
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries	(29,360)	(28,842)	(101,203)	(60,404)
(Provision for) Benefit from Income Taxes	0	0	0	0
Equity in earnings (loss) of subsidiaries	0	0	0	0
Net Income (Loss)	(29,360)	(28,842)	(101,203)	(60,404)	$ (138,225)
Intercompany Eliminations
Condensed Financial Statements, Captions [Line Items]
Operating revenues	0	0	0	0
Operating expenses	0	0	0	0
General and administrative	0	0	0	0
Merger transaction expense	0		0
Interest Expense	0	0	0	0
Interest income and other income (expense)	0	0	0	0
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries	0	0	0	0
(Provision for) Benefit from Income Taxes	0	0	0	0
Equity in earnings (loss) of subsidiaries	29,360	(12)	101,203	60
Net Income (Loss)	29,360	(12)	101,203	60
Parent Guarantor | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Operating revenues	0		0
Operating expenses	0		0
General and administrative	0		0
Merger transaction expense	0		0
Interest Expense	0		0
Interest income and other income (expense)	0		0
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries	0		0
(Provision for) Benefit from Income Taxes	0		0
Equity in earnings (loss) of subsidiaries	(29,360)		(101,203)
Net Income (Loss)	(29,360)		(101,203)
Parent Issuer | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Operating revenues		67,697		169,041
Operating expenses		(58,053)		(167,363)
General and administrative		(12,496)		(30,788)
Interest Expense		(13,926)		(44,014)
Interest income and other income (expense)		(12,076)		12,780
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries		(28,854)		(60,344)
(Provision for) Benefit from Income Taxes		0		0
Equity in earnings (loss) of subsidiaries		12		(60)
Net Income (Loss)		(28,842)		(60,404)
Subsidiary Issuer | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Operating revenues	131,126		322,334
Operating expenses	(83,172)		(217,042)
General and administrative	(12,696)		(34,427)
Merger transaction expense	(100)		(6,140)
Interest Expense	(13,165)		(39,348)
Interest income and other income (expense)	(51,353)		(126,580)
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries	(29,360)		(101,203)
(Provision for) Benefit from Income Taxes	0		0
Equity in earnings (loss) of subsidiaries	0		0
Net Income (Loss)	$ (29,360)		$ (101,203)
Subsidiary Guarantor | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Operating revenues		168		426
Operating expenses		(156)		(486)
General and administrative		0		0
Interest Expense		0		0
Interest income and other income (expense)		0		0
Income (loss) before income taxes and equity in earnings (loss) of subsidiaries		12		(60)
(Provision for) Benefit from Income Taxes		0		0
Equity in earnings (loss) of subsidiaries		0		0
Net Income (Loss)		$ 12		$ (60)

Guarantor Subsidiaries - Sche_3

Guarantor Subsidiaries - Schedule of Condensed Consolidating Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (29,360)	$ (28,842)	$ (101,203)	$ (60,404)	$ (138,225)
Other comprehensive income (loss)	0	0	0	0
Comprehensive Income (Loss)	(29,360)	(28,842)	(101,203)	(60,404)
Intercompany Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	29,360	(12)	101,203	60
Other comprehensive income (loss)	0	0		0
Comprehensive Income (Loss)	29,360	(12)	101,203	60
Parent Guarantor | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(29,360)		(101,203)
Other comprehensive income (loss)	0		0
Comprehensive Income (Loss)	(29,360)		(101,203)
Parent Issuer | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		(28,842)		(60,404)
Other comprehensive income (loss)		0		0
Comprehensive Income (Loss)		(28,842)		(60,404)
Subsidiary Issuer | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(29,360)		(101,203)
Other comprehensive income (loss)	0		0
Comprehensive Income (Loss)	$ (29,360)		$ (101,203)
Subsidiary Guarantor | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net income (loss)		12		(60)
Other comprehensive income (loss)		0		0
Comprehensive Income (Loss)		$ 12		$ (60)

Guarantor Subsidiaries - Sche_4

Guarantor Subsidiaries - Schedule of Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 160,185	$ 95,383
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions	(322,614)	(160,788)
Additions to furniture, fixtures and other	(616)	(268)
Repayment of debt associated with merger, net of cash acquired	(53,357)	0
Proceeds from sale of properties and other investing activities	11	(712)
Intercompany transfers	0	0
Cash flows from financing activities:
Proceeds from debt		275,000
Principal payments on debt	(350)	(322,228)
Proceeds from sale of common stock, net of offering costs	1	(298)
Intercompany transfers	0	0
Other financing activities	(4,746)	(6,045)
Increase (Decrease) in Cash and Cash Equivalents	(221,486)	(119,956)
Beginning Cash and Cash Equivalents	314,466	275,841
Ending Cash and Cash Equivalents	92,980	155,885
Intercompany Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	0	0
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions	0	0
Additions to furniture, fixtures and other	0	0
Repayment of debt associated with merger, net of cash acquired	0
Proceeds from sale of properties and other investing activities	0	0
Intercompany transfers	0	(374)
Cash flows from financing activities:
Proceeds from debt		0
Principal payments on debt	0	0
Proceeds from sale of common stock, net of offering costs	0	0
Intercompany transfers	0	374
Other financing activities	0	0
Increase (Decrease) in Cash and Cash Equivalents	0	0
Beginning Cash and Cash Equivalents	0	0
Ending Cash and Cash Equivalents	0	0
Parent Guarantor | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	0
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions	0
Additions to furniture, fixtures and other	0
Repayment of debt associated with merger, net of cash acquired	0
Proceeds from sale of properties and other investing activities	0
Intercompany transfers	0
Cash flows from financing activities:
Principal payments on debt	0
Proceeds from sale of common stock, net of offering costs	0
Intercompany transfers	0
Other financing activities	0
Increase (Decrease) in Cash and Cash Equivalents	0
Beginning Cash and Cash Equivalents	0
Ending Cash and Cash Equivalents	0
Parent Issuer | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities		95,009
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions		(160,788)
Additions to furniture, fixtures and other		(268)
Proceeds from sale of properties and other investing activities		(712)
Intercompany transfers		374
Cash flows from financing activities:
Proceeds from debt		275,000
Principal payments on debt		(322,228)
Proceeds from sale of common stock, net of offering costs		(298)
Intercompany transfers		0
Other financing activities		(6,045)
Increase (Decrease) in Cash and Cash Equivalents		(119,956)
Beginning Cash and Cash Equivalents	314,466	275,841
Ending Cash and Cash Equivalents		155,885
Subsidiary Issuer | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	160,185
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions	(322,614)
Additions to furniture, fixtures and other	(616)
Repayment of debt associated with merger, net of cash acquired	(53,357)
Proceeds from sale of properties and other investing activities	11
Intercompany transfers	0
Cash flows from financing activities:
Principal payments on debt	(350)
Proceeds from sale of common stock, net of offering costs	1
Intercompany transfers	0
Other financing activities	(4,746)
Increase (Decrease) in Cash and Cash Equivalents	(221,486)
Beginning Cash and Cash Equivalents	314,466
Ending Cash and Cash Equivalents	92,980
Subsidiary Guarantor
Cash flows from financing activities:
Proceeds from debt		0
Subsidiary Guarantor | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities		374
Cash flows from investing activities:
Additions to oil and gas properties, including acquisitions		0
Additions to furniture, fixtures and other		0
Proceeds from sale of properties and other investing activities		0
Intercompany transfers		0
Cash flows from financing activities:
Principal payments on debt		0
Proceeds from sale of common stock, net of offering costs		0
Intercompany transfers		(374)
Other financing activities		0
Increase (Decrease) in Cash and Cash Equivalents		0
Beginning Cash and Cash Equivalents	$ 0	0
Ending Cash and Cash Equivalents		$ 0