Amplify Energy (AMPY) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	AMPY
Entity Registrant Name	Amplify Energy Corp.
Entity Central Index Key	0001533924
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity File Number	001-35512
Entity Tax Identification Number	82-1326219
Entity Address, Address Line One	500 Dallas Street
Entity Address, Address Line Two	Suite 1700
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Incorporation, State or Country Code	DE
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	490-8900
Title of 12(b) Security	Common Stock
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		39,430,953

UNAUDITED CONDENSED CONSOLIDATE

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 7,408	$ 49,704
Restricted cash	325	325
Accounts receivable	32,554	29,514
Short-term derivative instruments	20,709	18,813
Prepaid expenses and other current assets	15,919	7,241
Total current assets	76,915	105,597
Property and equipment, at cost:
Oil and natural gas properties, successful efforts method	784,119	598,331
Support equipment and facilities	137,267	108,760
Other	12,431	6,625
Accumulated depreciation, depletion and impairment	(129,460)	(85,535)
Property and equipment, net	804,357	628,181
Long-term derivative instruments	17,715	2,469
Restricted investments	4,622	94,467
Operating lease - long term right-of-use asset	4,925	0
Other long-term assets	6,095	6,129
Total assets	914,629	836,843
Current liabilities:
Accounts payable	6,472	2,345
Revenues payable	26,754	24,779
Accrued liabilities (see Note 13)	26,327	23,155
Short-term derivative instruments	209	139
Total current liabilities	59,762	50,418
Long-term debt (see Note 8)	278,000	294,000
Asset retirement obligations	89,104	75,867
Long-term derivative instruments	489	0
Operating lease liability	3,214	0
Other long-term liabilities	4,015	0
Total liabilities	434,584	420,285
Commitments and contingencies (see Note 15)
Stockholders' equity:
Preferred stock, $0.01 par value: 50,000,000 shares authorized; no shares issued and outstanding at September 30, 2019 and Preferred stock, $0.0001 par value 45,000,000 shares authorized; no shares issued and outstanding at December 31, 2018	0	0
Warrants, 9,153,522 warrants issued and outstanding at September 30, 2019 and 2,173,913 warrants issued and outstanding at December 31, 2018, respectively	4,790	4,788
Common stock, $0.01 par value: 300,000,000 shares authorized; 39,978,099 shares issued and outstanding at September 30, 2019 and Common stock, $0.0001 par value 300,000,000 shares authorized; 22,181,881 shares issued and outstanding at December 31, 2018	209	3
Additional paid-in capital	435,019	355,872
Accumulated earnings	40,027	55,895
Total stockholders' equity	480,045	416,558
Total liabilities and equity	$ 914,629	$ 836,843

UNAUDITED CONDENSED CONSOLIDA_2

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.0001
Preferred stock, shares authorized	50,000,000	45,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Warrants issued	9,153,522	2,173,913
Warrants outstanding	9,153,522	2,173,913
Common stock, par value	$ 0.01	$ 0.0001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	39,978,099	22,181,881
Common stock, shares outstanding	39,978,099	22,181,881

UNAUDITED CONDENSED STATEMENTS

UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED OPERATIONS - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 72,959,000	$ 85,522,000	$ 197,646,000	$ 264,442,000
Costs and expenses:
Lease operating expense	32,977,000	27,505,000	88,179,000	84,575,000
Exploration	3,000	9,000	24,000	3,031,000
Taxes other than income	5,135,000	4,717,000	13,008,000	15,289,000
Depreciation, depletion and amortization	15,617,000	13,355,000	39,696,000	39,932,000
General and administrative expense	27,034,000	8,219,000	46,908,000	35,739,000
Accretion of asset retirement obligations	1,428,000	1,272,000	4,071,000	4,419,000
(Gain) loss on commodity derivative instruments	(28,725,000)	21,110,000	(19,231,000)	67,218,000
(Gain) loss on sale of properties	0	(707,000)	0	1,439,000
Other, net	224,000	639,000	401,000	519,000
Total costs and expenses	58,152,000	82,316,000	186,563,000	269,933,000
Operating income (loss)	14,807,000	3,206,000	11,083,000	(5,491,000)
Other income (expense):
Interest expense, net	(5,276,000)	(5,336,000)	(13,787,000)	(17,395,000)
Loss on lease	4,237,000	0	4,237,000	0
Other income (expense)	(104,000)	(2,000)	(104,000)	0
Total other income (expense)	(9,617,000)	(5,338,000)	(18,128,000)	(17,395,000)
Income (loss) before reorganization items, net and income taxes	5,190,000	(2,132,000)	(7,045,000)	(22,886,000)
Reorganization items, net	(33,000)	(466,000)	(684,000)	(1,752,000)
Income tax benefit (expense)	0	0	50,000	0
Net income (loss)	5,157,000	(2,598,000)	(7,679,000)	(24,638,000)
Net (income) loss allocated to participating restricted stockholders	(128,000)	0	0	0
Net income (loss) attributable to common stockholders	$ 5,029,000	$ (2,598,000)	$ (7,679,000)	$ (24,638,000)
Earnings per share: (See Note 10)
Basic and diluted earnings per share	$ 0.15	$ (0.10)	$ (0.29)	$ (0.98)
Weighted average common shares outstanding:
Basic and diluted	33,707	25,073	26,093	25,037
Oil and Natural Gas Sales [Member]
Revenues:
Total revenues	$ 72,426,000	$ 85,446,000	$ 196,978,000	$ 264,187,000
Other Revenues [Member]
Revenues:
Total revenues	533,000	76,000	668,000	255,000
Gathering, Processing and Transportation [Member]
Costs and expenses:
Gathering, processing and transportation	$ 4,459,000	$ 6,197,000	$ 13,507,000	$ 17,772,000

UNAUDITED CONDENSED STATEMENT_2

UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (7,679)	$ (24,638)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	39,696	39,932
(Gain) loss on derivative instruments	(18,897)	67,218
Cash settlements (paid) received on expired derivative instruments	2,315	6,287
Bad debt expense	266	0
Amortization and write-off of deferred financing costs	62	2,249
Accretion of asset retirement obligations	4,071	4,419
(Gain) loss on sale of properties	0	1,439
Share-based compensation (see Note 11)	4,073	3,090
Settlement of asset retirement obligations	(259)	(600)
Changes in operating assets and liabilities:
Accounts receivable	11,328	7,252
Prepaid expenses and other assets	(1,968)	1,698
Payables and accrued liabilities	(12,115)	8,279
Other	4,995	(15)
Net cash provided by operating activities	25,888	116,610
Cash flows from investing activities:
Cash acquired from the Merger	19,250	0
Additions to oil and gas properties	(63,004)	(46,002)
Additions to other property and equipment	788	(167)
Additions to restricted investments	(154)	(413)
Withdrawals of restricted investments	90,000	0
Proceeds from the sale of other property and equipment	31	0
Proceeds from the sale of oil and natural gas properties, net of cash and cash equivalents sold	0	18,088
Other	0	503
Net cash provided by (used in) investing activities	46,911	(27,991)
Cash flows from financing activities:
Advances on revolving credit facilities	103,000	21,000
Repayments of revolving credit facilities	(119,000)	(103,000)
Deferred financing costs	(832)	(18)
Dividends to stockholders	(8,189)	0
Costs incurred in conjunction with tender offer	(107)	0
Common stock repurchased and retired under the share repurchase program	(13,251)	0
Restricted units returned to plan	(313)	(815)
Other	156	9
Net cash provided by (used in) financing activities	(115,095)	(82,824)
Net change in cash, cash equivalents and restricted cash	(42,296)	5,795
Cash, cash equivalents and restricted cash, beginning of period	50,029	6,392
Cash, cash equivalents and restricted cash, end of period	7,733	12,187
Midstates [Member]
Cash flows from financing activities:
Repayments of revolving credit facilities	$ (76,559)	$ 0

UNAUDITED CONDENSED STATEMENT_3

UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Warrants [Member]	Additional Paid in Capital [Member]	Treasury Stock [Member]	Accumulated Earnings (Deficit) [Member]
Balance at Dec. 31, 2017	$ 393,933	$ 3	$ 4,788	$ 387,856		$ 1,286
Net income (loss)	3,239	0	0	0		3,239
Share-based compensation expense	1,176	0	0	1,176		0
Restricted shares repurchased	(208)	0	0	(208)		0
Balance at Mar. 31, 2018	398,140	3	4,788	388,824		4,525
Balance at Dec. 31, 2017	393,933	3	4,788	387,856		1,286
Net income (loss)	(24,638)
Balance at Sep. 30, 2018	371,579	3	4,788	390,140		(23,352)
Balance at Mar. 31, 2018	398,140	3	4,788	388,824		4,525
Net income (loss)	(25,279)	0	0	0		(25,279)
Share-based compensation expense	336	0	0	336		0
Restricted shares repurchased	(301)	0	0	(301)		0
Balance at Jun. 30, 2018	372,896	3	4,788	388,859		(20,754)
Net income (loss)	(2,598)	0	0	0		(2,598)
Share-based compensation expense	1,578	0	0	1,578		0
Restricted shares repurchased	(306)	0	0	(306)		0
Other	9	0	0	9		0
Balance at Sep. 30, 2018	371,579	3	4,788	390,140		(23,352)
Balance at Dec. 31, 2018	416,558	3	4,788	355,872	$ 0	55,895
Net income (loss)	(31,477)	0	0	0	0	(31,477)
Costs incurred in conjunction with tender offer	(107)	0	0	(107)	0	0
Share-based compensation expense	1,443	0	0	1,443	0	0
Common stock repurchased and retired under the share repurchase program	(920)	0	0	(920)	0	0
Balance at Mar. 31, 2019	385,497	3	4,788	356,288	0	24,418
Balance at Dec. 31, 2018	416,558	3	4,788	355,872	0	55,895
Net income (loss)	(7,679)
Balance at Sep. 30, 2019	480,045	209	4,790	435,019	0	40,027
Balance at Mar. 31, 2019	385,497	3	4,788	356,288	0	24,418
Net income (loss)	18,641	0	0	0	0	18,641
Share-based compensation expense	1,479	0	0	1,479	0	0
Common stock repurchased and retired under the share repurchase program	(331)	0	0	(331)	0	0
Restricted shares repurchased	(199)	0	0	(199)	0	0
Balance at Jun. 30, 2019	405,087	3	4,788	357,237	0	43,059
Net income (loss)	5,157	0	0	0	0	5,157
Equity transactions related to the Merger	91,246	206	2	91,038	0	0
Treasury shares acquired in the Merger	(2,723)	0	0	0	(2,723)	0
Retirement of treasury shares	0	0	0	(2,723)	2,723	0
Share-based compensation expense	1,151	0	0	1,151	0	0
Common stock repurchased and retired under the share repurchase program	(12,000)	0	0	(12,000)	0	0
Dividends	(8,189)	0	0	0	0	(8,189)
Restricted shares repurchased	(115)	0	0	(115)	0	0
Other	431	0	0	431	0	0
Balance at Sep. 30, 2019	$ 480,045	$ 209	$ 4,790	$ 435,019	$ 0	$ 40,027

Organization and Basis of Prese

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Basis of Presentation	General On August 6, 2019, Midstates Petroleum Company, Inc. (“Midstates”) completed its business combination (the “Merger”) with Amplify Energy Corp. (“Legacy Amplify”) in accordance with the terms of that certain Agreement and Plan of Merger, dated May 5, 2019 (the “Merger Agreement”), by and among Midstates, Legacy Amplify and Midstates Holdings, Inc., a Delaware corporation and direct, wholly owned subsidiary of Midstates (“Merger Sub”). Pursuant to the terms of the Merger Agreement, Merger Sub merged with and into Legacy Amplify, with Legacy Amplify surviving the Merger as a wholly owned subsidiary of Midstates, and immediately following the Merger, Legacy Amplify merged with and into Alpha Mike Holdings LLC, a Delaware limited liability company and wholly owned subsidiary of Midstates (“LLC Sub”), with LLC Sub surviving as a wholly owned subsidiary of Midstates. On the effective date of the Merger, Midstates changed its name to “Amplify Energy Corp.” (the “Company”) and LLC Sub changed its name to “Amplify Energy Holdings LLC.” For financial reporting purposes, the Merger represented a “reverse merger” and Legacy Amplify was deemed to be the accounting acquirer in the transaction. Legacy Amplify’s historical results of operations will replace Midstates’ historical results of operations for all periods prior to the Merger and, for all periods following the Merger, the Company’s financial statements will reflect the results of operations of the combined company. Accordingly, the financial statements for the Company included in this Quarterly Report for periods prior to the Merger are not the same as Midstates prior reported filings with the SEC, which were derived from the operations of Midstates. As a result, period-to-period comparisons of our operating results may not be meaningful. The results of any one quarter should not be relied upon as an indication of future performance. We operate in one reportable segment engaged in the acquisition, development, exploitation and production of oil and natural gas properties. Our management evaluates performance based on one reportable business segment as the economic environments are not different within the operation of our oil and natural gas properties. Our assets consist primarily of producing oil and natural gas properties and are located in Oklahoma, the Rockies, federal waters offshore Southern California, East Texas / North Louisiana and South Texas. Most of our oil and natural gas properties are located in large, mature oil and natural gas reservoirs. The Company’s properties consist primarily of operated and non-operated working interests in producing and undeveloped leasehold acreage and working interests in identified producing wells. Basis of Presentation Our Unaudited Condensed Consolidated Financial Statements included herein have been prepared pursuant to the rules and guidelines of the Securities and Exchange Commission (the “SEC”). The results reported in these Unaudited Condensed Consolidated Financial Statements should not necessarily be taken as indicative of results that may be expected for the entire year. In our opinion, the accompanying Unaudited Condensed Consolidated Financial Statements include all adjustments of a normal recurring nature necessary for fair presentation. Although we believe the disclosures in these financial statements are adequate, certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the SEC. The Unaudited Condensed Consolidated Financial Statements have been prepared as if the Company is a going concern and reflect the application of Accounting Standards Codification 852 “Reorganizations” (“ASC 852”). ASC 852 requires that the financial statements, for periods subsequent to the Chapter 11 filing, distinguish transactions and events that are directly associated with the reorganization from the ongoing operations of the business. Accordingly, certain expenses, gains and losses that were realized or incurred in the bankruptcy proceedings are recorded in “reorganization items, net” on the Company’s Unaudited Condensed Statements of Consolidated Operations. All material intercompany transactions and balances have been eliminated in preparation of our consolidated financial statements. Beginning in 2019, the Company has elected to change its reporting convention from natural gas equivalent (Mcfe) to barrels of oil equivalent (Boe). The change in presentation reflects our liquids-weighted production and reserve profile with a balanced approach to development of our oil and natural gas asset portfolio. Legacy Amplify’s proved reserves as of year-end 2018 were 50% crude oil, 15% natural gas liquids and 35% natural gas. Definitive Merger Agreement On May 5, 2019, as discussed above, the Company entered into the Merger Agreement pursuant to which Legacy Amplify merged with a subsidiary of Midstates in an all-stock merger-of-equals. Under the terms of the Merger Agreement, Legacy Amplify stockholders received 0.933 shares of newly issued Company common stock for each share of Legacy Amplify common stock that they owned. The Merger closed on August 6, 2019. Use of Estimates The preparation of the accompanying Unaudited Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates include, but are not limited to, oil and natural gas reserves; depreciation, depletion, and amortization of proved oil and natural gas properties; future cash flows from oil and natural gas properties; impairment of long-lived assets; fair value of derivatives; fair value of equity compensation; fair values of assets acquired and liabilities assumed in business combinations and asset retirement obligations.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	A discussion of our significant accounting policies and estimates is included in Legacy Amplify Form 10-K. Reorganization Items, Net The Company has incurred significant costs associated with the reorganization. Reorganization items, net, which are expensed as incurred, represent costs and income directly associated with the Chapter 11 proceedings since January 16, 2017, the petition date. The following table summarizes the components of reorganization items, net included in the accompanying Unaudited Condensed Statements of Consolidated Operations (in thousands): For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Professional fees 104 (14 ) (241 ) (638 ) Other (137 ) (452 ) (443 ) (1,114 ) Reorganization items, net $ (33 ) $ (466 ) $ (684 ) $ (1,752 ) Lease Recognition In February 2016, the Financial Accounting Standards Board (“FASB”) issued guidance regarding the accounting for leases. The FASB retained a dual model, requiring leases to be classified as either direct financing or operating leases. The classification will be based on criteria that are similar to the current lease accounting treatment. The Company is the lessee under various agreements for office space, compressors, equipment, vehicles and surface rentals (right of use assets) that are currently accounted for as operating leases. The Company applied the revised lease rules for our interim and annual reporting periods starting January 1, 2019 using the modified retrospective approach with a cumulative impact to retained earnings in that period, and including several optional practical expedients relating to leases commenced before the effective date. The practical expedients the Company adopted are: (1) the original correct assessment of a contract containing a lease will be accepted without further review on all existing or expired contracts; (2) the original lease classification as an operating lease will convert as an operating lease under the new guidance; (3) initial direct costs for any existing leases will not be reassessed; (4) existing land easements or right of use agreements will continue under current accounting policy and only new agreements will be evaluated in the future; and (5) short-term leases for twelve months or less will not be evaluated under the guidance. See Note 12 for additional information regarding the adoption of the leases standard. New Accounting Pronouncements Financial Instruments — Credit Losses . In May 2019 the FASB issued an accounting standards update to provide entities with an option to irrevocably elect the fair value option applied on an instrument-by-instrument basis for certain financial assets upon the adoption. The fair value option election does not apply to held-to-maturity debt securities. The new guidance is effective for annual periods beginning after December 15, 2019, and interim periods within those annual periods. The Company notes that the impact of this guidance will not be material to the Company’s financial statements and related disclosures. Other accounting standards that have been issued by the FASB or other standards-setting bodies are not expected to have a material impact on the Company’s financial position, results of operations and cash flows.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2019
Revenue From Contract With Customer [Abstract]
Revenue	Revenue from contracts with customers The Company adopted Accounting Standard Update (ASU) No. 2014-09, revenue from contracts with customers (ASC 606), on January 1, 2018 using the modified retrospective method of adoption. Adoption of the ASU did not require an adjustment to the opening balance of equity and did not materially change the Company’s amount and timing of revenues. The Company applied the ASU only to contracts that were not completed as of January 1, 2018. The reclassification of certain fees between oil and natural gas sales and gathering, processing and transportation is the result of the Company’s assessment of the point in time at which its performance obligations under its commodity sales contracts are satisfied and control of the commodity is transferred to the customer. The Company has determined that its contracts for the sale of crude oil, unprocessed natural gas, residue gas and NGLs contain monthly performance obligations to deliver product at locations specified in the contract. Control is transferred at the delivery location, at which point the performance obligation has been satisfied and revenue is recognized. Fees included in the contract that are incurred prior to control transfer are classified as gathering, processing and transportation and fees incurred after control transfers are included as a reduction to the transaction price. The transaction price at which revenue is recognized consists entirely of variable consideration based on quoted market prices less various fees and the quantity of volumes delivered. Oil and natural gas revenues are recorded using the sales method. Under this method, revenues are recognized based on actual volumes of oil and natural gas sold to purchasers, regardless of whether the sales are proportionate to our ownership in the property. An asset or a liability is recognized to the extent there is an imbalance in excess of the proportionate share of the remaining recoverable reserves on the underlying properties. No significant imbalances existed at September 30, 2019. Disaggregation of Revenue We have identified three material revenue streams in our business: oil, natural gas and NGLs. The following table present our revenues disaggregated by revenue stream. For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 (in thousands) Revenues Oil $ 55,011 $ 52,576 $ 136,754 $ 165,843 NGLs 4,306 12,132 15,509 34,009 Natural gas 13,109 20,738 44,715 64,335 Oil and natural gas sales $ 72,426 $ 85,446 $ 196,978 $ 264,187 Contract Balances Under our sales contracts, we invoice customers once our performance obligations have been satisfied, at which point payment is unconditional. Accordingly, our contracts do not give rise to contract assets or liabilities. Accounts receivable attributable to our revenue contracts with customers was $28.2 million at September 30, 2019 and $25.0 million at December 31, 2018. Transaction Price Allocated to Remaining Performance Obligations For our contracts that have a contract term greater than one year, we have utilized the practical expedient in ASC 606, which states that a company is not required to disclose the transaction price allocated to remaining performance obligations if the variable consideration is allocated entirely to a wholly unsatisfied performance obligation. Under our contracts, each unit of product delivered to the customer represents a separate performance obligation; therefore, future volumes are wholly unsatisfied and disclosure of the transaction price allocated to remaining performance obligations is not required. For our contracts that have a contract term of one year or less, we have utilized the practical expedient in ASC 606, which states that a company is not required to disclose the transaction price allocated to remaining performance obligations if the performance obligation is part of a contract that has an original expected duration of one year or less.

Acquisitions and Divestitures

Acquisitions and Divestitures	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Acquisitions and Divestitures	Acquisition and Divestiture Related Expenses Acquisition and divestiture related expenses for both related party and third party transactions are included in general and administrative expense in the accompanying Unaudited Condensed Statements of Consolidated Operations for the periods indicated below (in thousands): For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 $ 12,833 $ 82 $ 16,655 $ 969 Business Combination Acquisitions qualifying as a business combination are accounted for under the acquisition method of accounting, which requires, among other items, that assets acquired and liabilities assumed be recognized on the condensed consolidated balance sheet at their fair values as of the acquisition date. The fair value measurements of the oil and natural gas properties acquired and asset retirement obligations assumed were derived utilizing an income approach and based, in part, on significant inputs not observable in the market. These inputs represent Level 3 measurements in the fair value hierarchy and include, but are not limited to, estimates of reserves, future operating and development costs, estimated future cash flows and appropriate discount rates. These inputs required significant judgments and estimates at the time of the valuation. Merger On May 5, 2019, Midstates, Legacy Amplify and Merger Sub entered into the Merger Agreement pursuant to which, Merger Sub merged with and into Legacy Amplify, with Legacy Amplify surviving the Merger as a wholly owned subsidiary of Midstates. At the effective time of the Merger, each share of Legacy Amplify common stock issued and outstanding immediately prior to the effective time (other than excluded shares) were cancelled and converted into the right to receive 0.933 shares of Midstates common stock, par value $0.01 per share. On August 6, 2019, the effective date of the Merger, Midstates changed its name to “Amplify Energy Corp.” Purchase Price Allocation The Merger has been accounted for using the acquisition method, with Legacy Amplify treated as the acquirer for accounting purposes. The following table represents the preliminary allocation of the total purchase price of Midstates to the identifiable assets acquired and the liabilities assumed based on the fair values as of the acquisition date. Certain data necessary to complete the purchase price allocation is not yet available, and includes, but is not limited to, valuation of pre-acquisition contingencies, final tax returns that provide the underlying tax basis of Midstates assets and liabilities and final appraisals of assets acquired and liabilities assumed. We expect 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. Purchase Price Allocation (In thousands) Consideration: Fair value of Midstates common stock issued in the Merger (a) $ 90,150 Fair value of Midstates warrants issued in the Merger 2 Total consideration $ 90,152 Fair value of liabilities assumed: Current liabilities $ 24,135 Long-term debt 76,559 Long-term asset retirement obligation 9,440 Other long-term liabilities 5,067 Amounts attributable to liabilities assumed $ 115,201 Fair value of assets acquired: Cash and cash equivalents $ 19,250 Other current assets 17,862 Oil and natural gas properties 142,642 Other property and equipment 6,280 Long-term asset retirement cost 9,440 Other non-current assets 9,879 Amounts attributable to assets acquired $ 205,353 Total identifiable net assets $ 90,152 (a) Based on 20,415,005 Midstates common shares issued at closing at $4.12 per share (closing price as of August 6, 2019). We included in our condensed consolidated statements of operations revenues of $12.7 million, direct operating expense of $17.7 million and other expenses of $0.2 million for our Oklahoma properties for the period after the Merger closed. During the quarter ended September 30, 2019, the Company completed an analysis of Midstates asset retirement obligations as of the acquisition date. Based on this analysis, the Company recorded a measurement period adjustment of $0.9 to increase the asset retirement obligations liability. During the quarter ended September 30, 2019, the Company completed an analysis of Midstates leases under ASC 842 as of the acquisition date. Based on this analysis, the Company recorded an operating lease right of use asset and liability of approximately $0.3 million. Unaudited Pro Forma Financials The following unaudited pro forma financial information for the three and nine months ended September 30, 2019 and 2018, respectively, is based on our historical consolidated financial statements adjusted to reflect as if the Merger had occurred on January 1, 2018. The information below reflects pro forma adjustments based on available information and certain assumptions that we believe are reasonable, including adjustments to conform the classification of expenses in Midstates statements of operations to our classification for similar expenses and the estimated tax impact of pro forma adjustments. The unaudited pro forma financial information is not necessarily indicative of what actually would have occurred if the acquisition had been completed as of the beginning of the periods presented, nor is it necessarily indicative of future results. For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 (Unaudited) (In thousands, except per unit amounts) Revenues $ 80,482 $ 139,870 $ 258,547 $ 425,306 Net income (loss) 6,845 20,542 6,236 25,269 Earnings per share: Basic $ 0.20 $ 0.41 $ 0.24 $ 0.50 Diluted $ 0.20 $ 0.41 $ 0.24 $ 0.50 Divestitures On May 30, 2018, we closed a transaction to divest certain of our non-core assets located in South Texas (the “South Texas Divestiture”) for total proceeds of approximately $17.1 million, including final post-closing adjustments.

Fair Value Measurements of Fina

Fair Value Measurements of Financial Instruments	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements of Financial Instruments	Note 5. Fair Value Measurements of Financial Instruments 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 a specified measurement date. Fair value estimates are based on either (i) actual market data or (ii) assumptions that other market participants would use in pricing an asset or liability, including estimates of risk. A three-tier hierarchy has been established that classifies fair value amounts recognized or disclosed in the financial statements. The hierarchy considers fair value amounts based on observable inputs (Levels 1 and 2) to be more reliable and predictable than those based primarily on unobservable inputs (Level 3). All the derivative instruments reflected on the accompanying Unaudited Condensed Consolidated Balance Sheets were considered Level 2. The carrying values of accounts receivables, accounts payables (including accrued liabilities), restricted investments and amounts outstanding under long-term debt agreements with variable rates included in the accompanying Unaudited Condensed Consolidated Balance Sheets approximated fair value at September 30, 2019 and December 31, 2018. The fair value estimates are based upon observable market data and are classified within Level 2 of the fair value hierarchy. These assets and liabilities are not presented in the following tables. Assets and Liabilities Measured at Fair Value on a Recurring Basis The fair market values of the derivative financial instruments reflected on the accompanying Unaudited Condensed Consolidated Balance Sheets as of September 30, 2019 and December 31, 2018 were based on estimated forward commodity prices. Financial assets and liabilities are classified based on the lowest level of input that is significant to the fair value measurement in its entirety. The significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of the fair value of assets and liabilities and their placement within the fair value hierarchy levels. The following table presents the gross derivative assets and liabilities that are measured at fair value on a recurring basis at September 30, 2019 and December 31, 2018 for each of the fair value hierarchy levels: Fair Value Measurements at September 30, 2019 Using Quoted Prices in Significant Other Significant Active Market Observable Inputs Unobservable Inputs (Level 1) (Level 2) (Level 3) Fair Value (In thousands) Assets: Commodity derivatives $ — $ 41,758 $ — $ 41,758 Interest rate derivatives — 307 — 307 Total assets $ — $ 42,065 $ — $ 42,065 Liabilities: Commodity derivatives $ — $ 3,584 $ — $ 3,584 Interest rate derivatives — 755 — 755 Total liabilities $ — $ 4,339 $ — $ 4,339 Fair Value Measurements at December 31, 2018 Using Quoted Prices in Significant Other Significant Active Market Observable Inputs Unobservable Inputs (Level 1) (Level 2) (Level 3) Fair Value (In thousands) Assets: Commodity derivatives $ — $ 25,515 $ — $ 25,515 Liabilities: Commodity derivatives $ — $ 4,372 $ — $ 4,372 See Note 6 for additional information regarding our derivative instruments. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Certain assets and liabilities are reported at fair value on a nonrecurring basis as reflected on the accompanying Unaudited Condensed Consolidated Balance Sheets. The following methods and assumptions are used to estimate the fair values: • The fair value of asset retirement obligations (“AROs”) is based on discounted cash flow projections using numerous estimates, assumptions and judgments regarding factors such as the existence of a legal obligation for an ARO; amounts and timing of settlements; the credit-adjusted risk-free rate; and inflation rates. The initial fair value estimates are based on unobservable market data and are classified within Level 3 of the fair value hierarchy. See Note 7 for a summary of changes in AROs. • Proved oil and natural gas properties are reviewed for impairment when events and circumstances indicate a possible decline in the recoverability of the carrying value of such properties. The factors used to determine fair value include, but are not limited to, estimates of proved reserves, estimates of probable reserves, future commodity prices, the timing of future production and capital expenditures and a discount rate commensurate with the risk reflective of the lives remaining for the respective oil and natural gas properties. • Unproved oil and natural gas properties are reviewed for impairment based on time or geologic factors. Information such as drilling results, reservoir performance, seismic interpretation or future plans to develop acreage is also considered. • No impairments were recognized during the three or nine months ended September 30, 2019 and 2018, respectively.

Risk Management and Derivative

Risk Management and Derivative Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Risk Management and Derivative Instruments	Derivative instruments are utilized to manage exposure to commodity price fluctuations and achieve a more predictable cash flow in connection with natural gas and oil sales from production and borrowing related activities. These instruments limit exposure to declines in prices, but also limit the benefits that would be realized if prices increase. Certain inherent business risks are associated with commodity derivative contracts, including market risk and credit risk. Market risk is the risk that the price of natural gas or oil will change, either favorably or unfavorably, in response to changing market conditions. Credit risk is the risk of loss from nonperformance by the counterparty to a contract. It is our policy to enter into derivative contracts, only with creditworthy counterparties, which generally are financial institutions, deemed by management as competent and competitive market makers. Some of the lenders, or certain of their affiliates, under our previous and current credit agreements are counterparties to our derivative contracts. While collateral is generally not required to be posted by counterparties, credit risk associated with derivative instruments is minimized by limiting exposure to any single counterparty and entering into derivative instruments only with creditworthy counterparties that are generally large financial institutions. Additionally, master netting agreements are used to mitigate risk of loss due to default with counterparties on derivative instruments. We have also entered into International Swaps and Derivatives Association Master Agreements (“ISDA Agreements”) with each of our counterparties. The terms of the ISDA Agreements provide us and each of our counterparties with rights of set-off upon the occurrence of defined acts of default by either us or our counterparty to a derivative, whereby the party not in default may set-off all liabilities owed to the defaulting party against all net derivative asset receivables from the defaulting party. Had all counterparties failed completely to perform according to the terms of the existing contracts, we would have had the right to offset $36.6 million against amounts outstanding under our New Revolving Credit Facility (as defined below) at September 30, 2019, reducing our maximum credit exposure to approximately $1.4 million, of which approximately $1.2 million was with one counterparty. See Note 8 for additional information regarding our Emergence Credit Facility (as defined below) and our New Revolving Credit Facility (as defined below). Commodity Derivatives We may use a combination of commodity derivatives (e.g., floating-for-fixed swaps, put options, costless collars and three-way collars) to manage exposure to commodity price volatility. We recognize all derivative instruments at fair value. We enter into natural gas derivative contracts that are indexed to NYMEX-Henry Hub. We also enter into oil derivative contracts indexed to either NYMEX-WTI or ICE Brent. Our NGL derivative contracts are primarily indexed to OPIS Mont Belvieu. At September 30, 2019, we had the following open commodity positions: Remaining 2019 2020 2021 2022 Natural Gas Derivative Contracts: Fixed price swap contracts: Average monthly volume (MMBtu) 1,643,333 150,000 187,500 — Weighted-average fixed price $ 2.84 $ 2.65 $ 2.56 $ — Collar contracts: Two-way collars Average monthly volume (MMBtu) — 520,000 162,500 — Weighted-average floor price $ — $ 2.64 $ 2.58 $ — Weighted-average ceiling price $ — $ 2.96 $ 2.84 $ — Three-way collars Average monthly volume (MMBtu) 202,667 76,000 — — Weighted-average ceiling price $ 3.45 $ 3.45 $ — $ — Weighted-average floor price $ 2.65 $ 2.65 $ — $ — Weighted-average sub-floor price $ 2.15 $ 2.15 $ — $ — Natural Gas Basis Swaps: PEPL basis swaps: Average monthly volume (Bbls) — 600,000 500,000 — Weighted-average fixed price $ — $ (0.46 ) $ (0.40 ) $ — Crude Oil Derivative Contracts: Fixed price swap contracts: Average monthly volume (Bbls) 180,333 153,050 116,250 30,000 Weighted-average fixed price $ 55.25 $ 57.54 $ 56.05 $ 55.32 Collar contracts: Two-way collars Average monthly volume (Bbls) 76,000 14,300 — — Weighted-average floor price $ 55.00 $ 55.00 $ — $ — Weighted-average ceiling price $ 63.85 $ 62.10 $ — $ — Three-way collars Average monthly volume (MMBtu) 61,200 30,500 — — Weighted-average ceiling price $ 63.14 $ 65.75 $ — $ — Weighted-average floor price $ 53.75 $ 50.00 $ — $ — Weighted-average sub-floor price $ 43.75 $ 40.00 $ — $ — NGL Derivative Contracts: Fixed price swap contracts: Average monthly volume (Bbls) 72,000 65,425 22,800 — Weighted-average fixed price $ 29.96 $ 25.20 $ 24.25 $ — Interest Rate Swaps Periodically, we enter into interest rate swaps to mitigate exposure to market rate fluctuations by converting variable interest rates such as those in our credit agreement to fixed interest rates. At September 30, 2019, we had the following interest rate swap open positions: Remaining 2019 2020 2021 2022 Average Monthly Notional (in thousands) $ 125,000 $ 125,000 $ 125,000 $ 75,000 Weighted-average fixed rate 1.612 % 1.612 % 1.612 % 1.281 % Floating rate 1 Month LIBOR 1 Month LIBOR 1 Month LIBOR 1 Month LIBOR Balance Sheet Presentation The following table summarizes both: (i) the gross fair value of derivative instruments by the appropriate balance sheet classification even when the derivative instruments are subject to netting arrangements and qualify for net presentation in the balance sheet and (ii) the net recorded fair value as reflected on the balance sheet at September 30, 2019 and December 31, 2018. There was no cash collateral received or pledged associated with our derivative instruments since most of the counterparties, or certain of their affiliates, to our derivative contracts are lenders under our credit agreement. Asset Derivatives Liability Derivatives Asset Derivatives Liability Derivatives September 30, September 30, December 31, December 31, Type Balance Sheet Location 2019 2019 2018 2018 (In thousands) Commodity contracts Short-term derivative instruments $ 23,043 $ 2,584 $ 21,217 $ 2,543 Interest rate swaps Short-term derivative instruments 275 234 — — Gross fair value 23,318 2,818 21,217 2,543 Netting arrangements (2,609 ) (2,609 ) (2,404 ) (2,404 ) Net recorded fair value Short-term derivative instruments $ 20,709 $ 209 $ 18,813 $ 139 Commodity contracts Long-term derivative instruments $ 18,715 $ 1,000 $ 4,298 $ 1,829 Interest rate swaps Long-term derivative instruments 32 521 — — Gross fair value 18,747 1,521 4,298 1,829 Netting arrangements (1,032 ) (1,032 ) (1,829 ) (1,829 ) Net recorded fair value Long-term derivative instruments $ 17,715 $ 489 $ 2,469 $ — (Gains) Losses on Derivatives We do not designate derivative instruments as hedging instruments for accounting and financial reporting purposes. Accordingly, all gains and losses, including changes in the derivative instruments’ fair values, have been recorded in the accompanying Unaudited Condensed Statements of Consolidated Operations. The following table details the gains and losses related to derivative instruments for the periods indicated (in thousands): For the Three Months Ended For the Nine Months Ended Statements of September 30, September 30, Operations Location 2019 2018 2019 2018 Commodity derivative contracts (Gain) loss on commodity derivatives $ (28,725 ) $ 21,110 $ (19,231 ) $ 67,218 Interest rate derivatives Interest expense, net (199 ) — 334 —

Asset Retirement Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	The Company’s asset retirement obligations primarily relate to the Company’s portion of future plugging and abandonment costs for wells and related facilities. The following table presents the changes in the asset retirement obligations for the nine months ended September 30, 2019 (in thousands): Asset retirement obligations at beginning of period $ 76,344 Liabilities added from acquisition or drilling 9,477 Liabilities settled (259 ) Accretion expense 4,071 Revision of estimates (52 ) Asset retirement obligation at end of period 89,581 Less: Current portion (477 ) Asset retirement obligations - long-term portion $ 89,104

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Long-Term Debt	The following table presents our consolidated debt obligations at the dates indicated: September 30, December 31, 2019 2018 (In thousands) New Revolving Credit Facility (1) $ 278,000 $ 294,000 Long-term debt $ 278,000 $ 294,000 (1) The carrying amount of our New Revolving Credit Facility approximates fair value because the interest rates are variable and reflective of market rates. New Revolving Credit Facility Amplify Energy Operating LLC, our wholly owned subsidiary (“OLLC”), is a party to a reserve-based revolving credit facility (the “New Revolving Credit Facility”), subject to a borrowing base of $530.0 million as of September 30, 2019, which is guaranteed by us and all of our current subsidiaries. The New Revolving Credit Facility matures on November 2, 2023. In connection with the Merger, on August 6, 2019, Amplify Energy Operating LLC and Amplify Acquisitionco LLC entered into a Borrowing Base Redetermination, Commitment Increase and Joinder Agreement to Credit Agreement, with the guarantors party thereto, the lenders party thereto and Bank of Montreal, as administrative agent (the “Joinder Agreement”). The Joinder Agreement amends the New Revolving Credit Facility to, among other things: • redetermine the borrowing base of the New Revolving Credit Facility, by increasing the borrowing base from $425.0 million to $530.0 million; • increase the commitments of certain of the original lenders under the New Revolving Credit Facility; and • add additional lenders as parties to the New Revolving Credit Facility. Upon closing of the Merger on August 6, 2019, Midstates’ existing reserve-based revolving credit facility was terminated and all remaining borrowings were repaid by the Company. On June 24, 2019, as discussed in Note 15, the Company received the release of $90.0 million from the Beta decommissioning trust account and used the proceeds to reduce amounts outstanding under our New Revolving Credit Facility. Our borrowing base under our New Revolving Credit Facility is subject to redetermination on at least a semi-annual basis primarily based on a reserve engineering report with respect to our estimated natural gas, oil and NGL reserves, which takes into account the prevailing natural gas, oil and NGL prices at such time, as adjusted for the impact of our commodity derivative contracts. Second Amendment to New Revolving Credit Facility On July 16, 2019, OLLC entered into the Second Amendment to Credit Agreement (the “Second Amendment”), among OLLC, Amplify Acquisitionco Inc., Amplify Energy, the guarantors party thereto, the lenders party thereto and Bank of Montreal, as administrative agent (the “Administrative Agent”). The Second Amendment amends the parties’ existing Credit Agreement, dated as of November 2, 2018, in connection with the completion of the Merger, following which Midstates may contribute, through a series of transactions, the equity interests it holds in Midstates Petroleum Company, LLC, a Delaware limited liability company, to the borrower (the “Contribution”), to, among other things, (i) provide that if the Merger and the Contribution are not consummated on or prior to August 31, 2019, the Administrative Agent and the lenders have the right (but not the obligation) to redetermine the borrowing base on or after September 1, 2019 and (ii) amend certain other provisions of the New Revolving Credit Facility. First Amendment to New Revolving Credit Facility On May 5, 2019, OLLC entered into the First Amendment to Credit Agreement, among OLLC, Amplify Acquisitionco Inc., Amplify Energy, the guarantors party thereto, the lenders party thereto and Bank of Montreal, as administrative agent (the “First Amendment”). The First Amendment amends the New Revolving Credit Facility to, among other things, (i) modify certain defined terms in connection with the completion of the transactions contemplated by the Merger Agreement, including the Merger; (ii) allow certain structural changes for tax planning activities; and (iii) modify certain covenants in the New Revolving Credit Facility that restrict Amplify Energy’s ability to take certain actions or engage in certain business such that, once the First Amendment is effective, the occurrence of such actions or business in connection with the Merger Agreement or completion of the transactions contemplated thereby, including the Merger, will not be so restricted. Certain of the modifications to the New Revolving Credit Facility, including those permitting pre-Merger tax restrictions, became effective upon the signing of the First Amendment. The remaining modifications become effective concurrently with the consummation of the Merger, subject to certain closing conditions. The First Amendment also contains customary representations, warranties and agreements of OLLC and the guarantors. All other material terms and conditions of the New Revolving Credit Facility were unchanged by the First Amendment. The foregoing description of the First Amendment is qualified in its entirety by reference to the First Amendment, which is attached as Exhibit 10.1 to Legacy Amplify’s current report on Form 8-K filed on May 6, 2019. Emergence Credit Facility At September 30, 2018, OLLC, was a party to a $1.0 billion revolving credit facility (our “Emergence Credit Facility”) which was guaranteed by us and all of our current subsidiaries. On November 2, 2018, in connection with entry into our New Revolving Credit Facility, the Emergence Credit Facility was terminated and repaid in full. Weighted-Average Interest Rates The following table presents the weighted-average interest rates paid, excluding commitment fees, on our consolidated variable-rate debt obligations for the periods presented: For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 New Revolving Credit Facility 4.89% n/a 4.99% n/a Emergence Credit Facility n/a 5.94% n/a 5.73% Letters of Credit At September 30, 2019, we had $1.7 million of letters of credit outstanding, primarily related to operations at our Wyoming properties. Unamortized Deferred Financing Costs Unamortized deferred financing costs associated with our New Revolving Credit Facility was $5.0 million at September 30, 2019. At September 30, 2019, the unamortized deferred financing costs are amortized over the remaining life of our New Revolving Credit Facility.

Equity (Deficit)

Equity (Deficit)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Equity (Deficit)	Common Stock The Company’s authorized capital stock includes 300,000,000 shares of common stock, $0.01 par value per share. The following is a summary of the changes in our common stock issued for the nine months ended September 30, 2019: Common Shares Balance, December 31, 2018 22,181,881 Issuance of common stock — Restricted stock units vested 412,938 Repurchase of common shares (120,163 ) Common stock repurchased and retired under share repurchase program (169,400 ) Balance, June 30, 2019 22,305,256 Restricted stock units vested 38,181 Repurchase of common shares (9,427 ) Balance, August 5, 2019 22,334,010 Ratio to convert Amplify shares 0.933 Common stock issued to Legacy Amplify stockholders 20,837,633 Midstates stock outstanding and acquired with the Merger 20,415,005 Treasury shares acquired from the Merger 205,861 Restricted stock units vested 602,053 Repurchase of common shares (11,740 ) Common stock repurchased and retired under share repurchase program (1,723,146 ) Cancelation and retirement of shares (347,567 ) Balance, September 30, 2019 39,978,099 Treasury Stock As of August 5, 2019, Midstates had 205,861 treasury shares outstanding. After the Merger closed, the Company retired and cancelled all treasury stock outstanding. No treasury stock remained outstanding at September 30, 2019. Warrants On the May 4, 2017 (the “Effective Date”), Legacy Amplify entered into a warrant agreement (the “Warrant Agreement”) with American Stock Transfer & Trust Company, LLC, as warrant agent (“AST”), pursuant to which Legacy Amplify issued warrants to purchase up to 2,173,913 shares of Legacy Amplify’s common stock (representing 8% of Legacy Amplify’s outstanding common stock as of the Effective Date including shares of Legacy Amplify’s common stock issuable upon full exercise of the warrants, but excluding any common stock issuable under Legacy Amplify’s Management Incentive Plan (the “MIP”)), exercisable for a five-year period commencing on the Effective Date at an exercise price of $42.60 per share. On the effective date of the Merger, Legacy Amplify, Midstates and AST entered into an Assignment and Assumption Agreement, pursuant to which the Company agreed to assume Legacy Amplify’s Warrant Agreement. As of August 5, 2019, Midstates had outstanding warrants of 4,647,520 Third Lien Notes Warrants at an exercise price of $22.78 per share (the “Third Lien Warrants”) and 2,332,089 Unsecured Creditor Warrants at an exercise price of $43.67 per share (the “Unsecured Creditor Warrants” and collectively with the Third Lien Warrants, the “Warrants”). The Warrants expire on April 21, 2020. As a result of the Merger, the value of the outstanding Warrants were adjusted downward based on the low stock price and estimated fair value as of the Merger date. See Note 4 for additional information regarding the purchase price allocation of the Merger. Share Repurchase Program On December 21, 2018, Legacy Amplify’s board of directors authorized the repurchase of up to $25.0 million of Legacy Amplify outstanding shares of common stock, with repurchases beginning on January 9, 2019. During the six months ended June 30, 2019, Legacy Amplify repurchased 169,400 shares of common stock at an average price of $7.35 for a total cost of approximately $1.3 million. On April 18, 2019, in anticipation of the Merger, Legacy Amplify terminated the repurchase program. In connection, with the closing of the Merger, the board of directors approved the commencement of an open market share repurchase program of up to $25.0 million of the Company’s outstanding shares of common stock, with repurchases beginning on or after August 6, 2019. During the three months ended September 30, 2019, the Company repurchased 1,773,146 shares of common stock at an average price of $5.81 for a total cost of approximately $10.4 million. Cash Dividend Payment On August 6, 2019, our board of directors approved a dividend of $0.20 per share of outstanding common stock or $8.2 million in aggregate, which was paid on September 18, 2019, to stockholders of record at the close of business on September 4, 2019. The amount of future dividends is subject to discretionary approval by the board of directors.

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings per Share	The following sets forth the calculation of earnings (loss) per share, or EPS, for the periods indicated (in thousands, except per share amounts): For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Net income (loss) $ 5,157 $ (2,598 ) $ (7,679 ) $ (24,638 ) Less: Net income allocated to participating restricted stockholders 128 — — — Basic and diluted earnings available to common stockholders $ 5,029 $ (2,598 ) $ (7,679 ) $ (24,638 ) Common shares/units: Common shares outstanding — basic 33,707 25,073 26,093 25,037 Dilutive effect of potential common shares — — — — Common shares outstanding — diluted 33,707 25,073 26,093 25,037 Net earnings per share: Basic $ 0.15 $ (0.10 ) $ (0.29 ) $ (0.98 ) Diluted $ 0.15 $ (0.10 ) $ (0.29 ) $ (0.98 ) Antidilutive stock options (1) 3 116 3 116 Antidilutive warrants (2) 9,154 2,174 9,154 2,174 (1) Amount represents options to purchase common stock that are excluded from the diluted net earnings per share calculations because of their antidilutive effect. (2) Amount represents warrants to purchase common stock that are excluded from the diluted net earnings per share calculations because of their antidilutive effect.

Long-Term Incentive Plans

Long-Term Incentive Plans	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Long-Term Incentive Plans	In May 2017, Legacy Amplify implemented the Management Incentive Plan (the “MIP”). An aggregate of 2,166,803 shares of Legacy Amplify common stock were reserved for issuance under the MIP. In connection with the closing of the Merger, on August 6, 2019, the Company assumed the MIP. Restricted Stock Units Restricted Stock Units with Service Vesting Condition The restricted stock units with service vesting conditions (“TSUs”) are accounted for as equity-classified awards. The grant-date fair value is recognized as compensation cost on a straight-line basis over the requisite service period and forfeitures are accounted for as they occur. Compensation costs are recorded as general and administrative expense. The unrecognized cost associated with the TSUs was $3.2 million at September 30, 2019. We expect to recognize the unrecognized compensation cost for these awards over a weighted-average period of approximately 1.6 years. The following table summarizes information regarding the TSUs granted under the MIP for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) TSUs outstanding at December 31, 2018 557,963 $ 11.41 Granted (2) 280,416 $ 6.80 Forfeited (35,596 ) $ 11.13 Vested (444,142 ) $ 9.01 TSUs outstanding at September 30, 2019 358,641 $ 10.71 (1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued. (2) The aggregate grant date fair value of TSUs issued for the nine months ended September 30, 2019 was $1.9 million based on a grant date market price ranging from $4.48 to $8.70 per share. Restricted Stock Units with Market and Service Vesting Conditions The restricted stock units with market and service vesting conditions (“PSUs”) are accounted for as equity-classified awards. The grant-date fair value is recognized as compensation cost on a graded-vesting basis. As such, the Company recognizes compensation cost over the requisite service period for each separately vesting tranche of the award as though the award were, in substance, multiple awards. The Company accounts for forfeitures as they occur. Compensation costs are recorded as general and administrative expense. The unrecognized cost related to the PSUs was $0.6 million at September 30, 2019. We expect to recognize the unrecognized compensation cost for these awards over a weighted-average period of approximately 1.2 years. The PSUs will vest based on the satisfaction of service and market vesting conditions with market vesting based on the Company’s achievement of certain share price targets. The PSUs are subject to service-based vesting such that 50% of the PSUs service vest on the applicable market vesting date and an additional 25% of the PSUs service vest on each of the first and second anniversaries of the applicable market vesting date. In the event of a qualifying termination, subject to certain conditions, (i) all PSUs that have satisfied the market vesting conditions will fully service vest, upon such termination, and (ii) if the termination occurs between the second and third anniversaries of the grant date, then PSUs that have not market vested as of the termination will market vest to the extent that the share targets (in each case, reduced by $0.25) are achieved as of such termination. Subject to the foregoing, any unvested PSUs will be forfeited upon termination of employment. A Monte Carlo simulation was used in order to determine the fair value of these awards at the grant date. The assumptions used to estimate the fair value of the PSUs are as follows: Share price targets $ 12.50 $ 15.00 $ 17.50 Risk-free interest rate: Awards Issued on January 1, 2019 2.44 % 2.44 % 2.44 % Awards Issued on April 1, 2019 2.28 % 2.28 % 2.28 % Awards Issued on July 1, 2019 1.73 % 1.73 % 1.73 % Dividend yield — — — Expected volatility: Awards Issued on January 1, 2019 54.0 % 54.0 % 54.0 % Awards Issued on April 1, 2019 50.0 % 50.0 % 50.0 % Awards Issued on July 1, 2019 57.0 % 57.0 % 57.0 % Calculated fair value per PSU: Awards Issued on January 1, 2019 $ 6.76 $ 5.86 $ 5.11 Awards Issued on April 1, 2019 $ 4.22 $ 3.43 $ 2.80 Awards Issued on July 1, 2019 $ 2.63 $ 2.05 $ 1.64 The following table summarizes information regarding the PSUs granted under the MIP for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) PSUs outstanding at December 31, 2018 367,141 $ 8.14 Granted (2) 16,562 $ 4.06 Forfeited (44,552 ) $ 7.59 Vested — $ — PSUs outstanding at September 30, 2019 339,151 $ 8.01 (1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued. (2) The aggregate grant date fair value of PSUs issued for the nine months ended September 30, 2019 was less than $0.1 million based on a calculated fair value price ranging from $1.64 to $6.76 per share. 2017 Non-Employee Directors Compensation Plan In June 2017, Legacy Amplify implemented the 2017 Non-Employee Directors Compensation Plan (“Directors Compensation Plan”) to attract and retain the services of experienced non-employee directors of Legacy Amplify or its subsidiaries. An aggregate of 186,600 shares of Legacy Amplify’s common stock were reserved for issuance under the Directors Compensation Plan. In connection with the closing of the Merger, on August 6, 2019, the Company assumed the Directors Compensation Plan. The restricted stock units with a service vesting condition (“Board RSUs”) are accounted for as equity-classified awards. The grant-date fair value is recognized as compensation cost on a straight-line basis over the requisite service period and forfeitures are accounted for as they occur. Compensation costs are recorded as general and administrative expense. The unrecognized cost associated with restricted stock unit awards was $0.4 million at September 30, 2019. We expect to recognize the unrecognized compensation cost for these awards over a weighted-average period of approximately 2.1 years. The following table summarizes information regarding the Board RSUs granted under the Directors Compensation Plan for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) Board RSUs outstanding at December 31, 2018 36,955 $ 11.36 Granted (2) 40,060 $ 6.95 Forfeited — $ — Vested (46,396 ) $ 9.54 Board RSUs outstanding at September 30, 2019 30,619 $ 8.35 (1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued. (2) The aggregate grant date fair value of Board RSUs issued for the nine months ended September 30, 2019 was $0.3 million based on grant date market price of $6.95 per share. Compensation Expense The following table summarizes the amount of recognized compensation expense associated with the MIP and Directors Compensation Plan, which are reflected in the accompanying Unaudited Condensed Statements of Consolidated Operations for the periods presented (in thousands): For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Equity classified awards TSUs $ 650 $ 490 $ 1,852 $ 601 PSUs 120 495 825 747 Board RSUs 58 44 221 98 Restricted stock options — 39 — 115 $ 828 $ 1,068 $ 2,898 $ 1,561 Midstates 2016 Long Term Incentive Plan On October 21, 2016, Midstates established the 2016 Long-term Incentive Plan (“Midstates 2016 LTIP”) and filed a Form S-8 with the SEC, registering 3,513,950 shares for issuance under the terms of the Midstates 2016 LTIP to employees, directors and certain other persons (the “Award Shares”). The types of awards that may be granted under the Midstates 2016 LTIP include stock options, restricted stock units, restricted stock, performance awards and other forms of awards granted or denominated in shares of common stock, as well as certain cash-based awards (the “Awards”). The terms of each award were determined by Midstates compensation committee of the board of directors. Awards that expire, or are canceled, forfeited, exchanged, settled in cash or otherwise terminated, will again be available for future issuance under the Midstates 2016 LTIP. Midstates Restricted Stock Units At September 30, 2019, the Company had 25,662 non-vested restricted stock units outstanding to employees and non-employee directors pursuant to the Midstates 2016 LTIP, excluding restricted stock units issued to non-employee directors containing a market condition, which are discussed below. The Midstates non-vested restricted stock units are accounted for as equity-classified awards. Restricted stock units granted to employees in 2019 under the Midstates 2016 LTIP vest in full on March 1, 2021, or upon the occurrence of a change in control, provided the employee has not terminated employment prior to such vesting date. Remaining non-vested employee restricted stock units will vest upon termination after the Merger transition period in the fourth quarter of 2019. Restricted stock units granted to non-employee directors during 2019 vest on the first to occur of (i) December 31, 2019, (ii) the date the non-employee director ceases to be a director of the board of directors (other than for cause), (iii) the director’s death, (iv) the director’s disability or (v) a change in control of Midstates. The following table summarizes the Midstates non-vested restricted stock unit award activity for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) Midstates non-vested restricted stock units outstanding at August 6, 2019 353,464 $ 12.25 Granted — $ — Forfeited — $ — Vested (327,802 ) $ 12.02 Midstates non-vested restricted stock units outstanding at September 30, 2019 25,662 $ 15.23 Midstates Stock Options At September 30, 2019, the Company had 3,495 non-vested options outstanding pursuant to the Midstates 2016 LTIP. The Midstates stock options are accounted for as equity-classified awards. Stock Option Awards currently outstanding under Midstates 2016 LTIP vest ratably over a period of three years: one-sixth vest on the six-month anniversary of the grant date, an additional one-sixth vest on the twelve-month anniversary of the grant date, an additional one-third vest on the twenty-four month anniversary of the grant date and the final one-third vest on the thirty-six month anniversary of the grant date. Stock Option Awards expire 10 years from the grant date. The following table summarizes the Midstates 2016 LTIP non-vested stock option activity for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) Midstates stock options outstanding at August 6, 2019 54,365 $ 19.68 Granted — $ — Forfeited — $ — Vested (50,870 ) $ 19.68 Midstates stock options outstanding at September 30, 2019 3,495 $ 19.66 Non-Employee Director Restricted Stock Units Containing a Market Condition On November 23, 2016, Midstates issued restricted stock units to non-employee directors that contained a market vesting condition. Midstates previously recognized the non-employee director restricted stock units containing a market condition as liability awards. These restricted stock units would have vested (i) on the first business day following the date on which the trailing 60-day average share price (including any dividends paid) of Midstates common stock is equal to or greater than $30.00 or (ii) upon a change in control (as defined in the Midstates 2016 LTIP). Additionally, all unvested restricted stock units containing a market vesting condition will be immediately forfeited upon the first to occur of (i) the fifth anniversary of the grant date or (ii) any participant’s termination as a director for any reason (except for a termination as part of a change in control of Midstates). On August 5, 2019, Midstates had 50,864 market condition awards outstanding and on August 5, 2019 all 50,864 shares were vested. No shares were outstanding at September 30, 2019 related to non-employee director restricted stock units containing a market condition. As of September 30, 2019, there were no unrecognized stock-based compensation expense related to market condition awards. Midstates Chief Executive Officer (“CEO”) Restricted Stock Units Containing a Market Condition On November 1, 2017, Midstates issued 135,778 restricted stock units to its CEO that contained a market vesting condition. These restricted stock units will vest, if at all, based on Midstates total stockholder return for the performance period of October 25, 2017, through October 31, 2020. Market conditions under this grant are (i) with respect to 50% of the restricted stock units granted, Midstates cumulative total shareholder return (“TSR”) which is defined as the change in the value of the stock over the performance period with the beginning and ending stock price based on a 20-day average stock price and (ii) with respect to the remaining 50% of the restricted stock units granted, the percentile rank of Midstates TSR compared to the TSR of the Peer Group over the performance period (“Relative TSR”). To the extent that actual TSR or Relative TSR for the performance period is between specified vesting levels, the portion of the restricted stock units that shall become vested based on actual and Relative TSR performance shall be determined on a pro-rata basis using straight-line interpolation; provided that the maximum portion of the RSUs that may become vested based on actual cumulative TSR or Relative TSR for the performance period shall not exceed 120% of the awards granted. On August 5, 2019, Midstates had 135,778 restricted stock units outstanding to its CEO and on August 5, 2019 all 135,778 shares were vested. No shares were outstanding at September 30, 2019. Midstates 2018 Performance Stock Units Issued to Certain Members of Executive Management Containing a Market Condition On March 1, 2018, Midstates issued 96,305 restricted stock units to certain members of Midstates executive management team that contained a market vesting condition. Midstates previously accounted for these restricted stock award as equity awards. If a member of Midstates executive management team had terminated its employment prior to vesting, the outstanding award would have been forfeited. Midstates executive management restricted stock units with a market condition were subject to accelerated vesting in the event the executive’s employment is terminated prior to vesting by Midstates without “Cause” or by the participant with “Good Reason” (each, as defined in the Midstates 2016 LTIP) or due to the executive’s death or disability. Upon a change in control (as defined in the Midstates 2016 LTIP), the Midstates compensation committee of the board of directors could (i) accelerate all or a portion of the award, (ii) cancel all of the award and pay cash, stock or combination equal to the change in control price, (iii) provide for the assumption or substitution or continuation by the successor company, (iv) certify to the extent to which the vesting conditions had been achieved prior to the conclusion of the performance period or (v) adjust restricted stock units to reflect the change in control. On August 5, 2019 all 96,305 restricted stock units issued had vested noting no shares outstanding at September 30, 2019. Midstates 2019 Performance Stock Units Issued to Certain Members of Executive Management Containing a Market Condition On March 7, 2019, Midstates issued 193,921 restricted stock units to certain members of Midstates executive management team that contained a market vesting condition. Midstates previously accounted for these restricted stock awards as equity awards. On August 5, 2019 all 193,921 restricted stock units issued were cancelled and no shares were outstanding at September 30, 2019.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	Note 12. Leases As discussed in Note 2, the Company adopted ASU 842, leases, on January 1, 2019 using the modified retrospective approach with a cumulative impact to retained earnings. The adoption of this standard has resulted in an increase in the assets and liabilities on the Company’s Unaudited Condensed Consolidated Balance Sheet. The Company has completed the review and evaluation of current and potential leases which resulted primarily in our corporate office lease and some minor equipment and vehicle leases qualifying under the new guidance. Based upon this analysis, the impact of the new guidance established a liability and the corresponding asset of $5.4 million at January 1, 2019. For the quarter ended September 30, 2019, our leases qualify as operating leases and we did not have any existing or new leases qualifying as financing leases. We have leases for office space and equipment in our corporate office and operating regions as well as vehicles, compressors and surface rentals related to our business operations. In addition, we have offshore Southern California pipeline right-of-way use agreements. Most of our leases, other than our corporate office lease, have an initial term and may be extended on a month-to-month basis after expiration of the initial term. Most of our leases can be terminated with 30-day prior written notice. The majority of our month-to-month leases are not included as a lease liability in our balance sheet under ASC 842 because continuation of the lease is not reasonably certain. Additionally, the Company elected the short-term practical expedient to exclude leases with a term of twelve months or less. Our corporate office lease does not provide an implicit rate. To determine the present value of the lease payments, we use our incremental borrowing rate based on the information available at the inception date. To determine the incremental borrowing rate, we apply a portfolio approach based on the applicable lease terms and the current economic environment. We use a reasonable market interest rate for our office equipment and vehicle leases. The following table presents the Company’s right-of-use assets and lease liabilities as of September 30, 2019. September 30, 2019 (In thousands) Right-of-use asset $ 4,925 Lease liabilities: Current lease liability 1,732 Long-term lease liability 3,214 Total lease liability $ 4,946 The following table reflects the Company’s maturity analysis of the minimum lease payment obligations under non-cancelable operating leases with a remaining term in excess of one year (in thousands): Office leases Leased vehicles and office equipment Total Remaining 2019 $ 399 $ 175 $ 574 2020 1,231 537 1,768 2021 1,727 627 2,354 2022 and thereafter 411 119 530 Total lease payments $ 3,768 $ 1,458 $ 5,226 Less: interest $ 220 $ 60 $ 280 Present value of lease liabilities $ 3,548 $ 1,398 $ 4,946 The following is a schedule of the Company’s future contractual payment for operating leases prepared in accordance with accounting standards prior to the adoption of ASC 842, as of December 31, 2018 (in thousands): Payment or Settlement Due by Period Operating leases Total 2019 2020 2021 2022 2023 Thereafter Operating leases $ 11,846 $ 5,893 $ 2,072 $ 2,109 $ 337 $ 205 $ 1,230 The weighted average remaining lease terms and discount rate for all of our operating leases were as follow as of September 30, 2019: September 30, 2019 Weighted average remaining lease term (years): Office leases 1.67 Vehicles 0.53 Office equipment 0.09 Weighted average discount rate: Office leases 3.61 % Vehicles 0.85 % Office equipment 0.18 % During the three months ended September 30, 2019, the Company recorded a $4.2 million loss on lease, which relates to the Midstates corporate office lease. The office will be vacated by mid-November. Because of excess sublease inventory in the local market, a liability has been accrued for rent and other operating expenses based upon the term and provisions of the lease. We have instituted internal controls going forward to monitor and evaluate new leases for appropriate accounting under the new guidance.

Supplemental Disclosures to the

Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows	9 Months Ended
	Sep. 30, 2019
Supplemental Disclosures To Condensed Consolidated Statements Of Cash Flows [Abstract]
Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows	Note 13. Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows Accrued Liabilities Current accrued liabilities consisted of the following at the dates indicated (in thousands): September 30, December 31, 2019 2018 Accrued lease operating expense $ 11,561 $ 10,469 Accrued capital expenditures 5,448 4,349 Accrued general and administrative expense 4,459 4,393 Accrued ad valorem tax 2,541 729 Operating lease liability 1,732 — Asset retirement obligations 477 477 Accrued interest payable 38 2,476 Other 71 262 Accrued liabilities $ 26,327 $ 23,155 Cash and Cash Equivalents Reconciliation The following table provides a reconciliation of cash and cash equivalents on the Unaudited Condensed Consolidated Balance Sheet to cash, cash equivalents and restricted cash on the Unaudited Condensed Statements of Consolidated Cash Flows (in thousands): September 30, December 31, 2019 2018 Cash and cash equivalents $ 7,408 $ 49,704 Restricted cash 325 325 Total cash, cash equivalents and restricted cash $ 7,733 $ 50,029 Supplemental Cash Flows Supplemental cash flows for the periods presented (in thousands): For the Nine Months Ended September 30, 2019 2018 Supplemental cash flows: Cash paid for interest, net of amounts capitalized $ 12,477 $ 15,405 Cash paid for reorganization items, net 684 2,004 Noncash investing and financing activities: Increase (decrease) in capital expenditures in payables and accrued liabilities 324 (565 ) Assets acquired & liabilities assumed in the Merger: Accounts receivable 14,633 — Prepaids and other current assets 3,229 — Other non-current assets 9,879 Oil and natural gas properties 142,642 — Other property and equipment 6,280 Accounts payable and accrued liabilities (24,135 ) — Other non-current liabilities (5,067 ) — Long-term debt (76,559 ) — Issuance of common stock in connection with the Merger 90,150 —

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Agreements There have been no transactions in excess of $120,000 between us and any related person in which the related person had a direct or indirect material interest for the three and nine months ended September 30, 2019 and 2018, respectively.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Litigation and Environmental We are not aware of any litigation, pending or threatened, that we believe will have a material adverse effect on our financial position, results of operations or cash flows; however, cash flow could be significantly impacted in the reporting periods in which such matters are resolved. Although we are insured against various risks to the extent we believe it is prudent, there is no assurance that the nature and amount of such insurance will be adequate, in every case, to indemnify us against liabilities arising from future legal proceedings. At September 30, 2019 and December 31, 2018, we had no environmental reserves recorded on our Unaudited Condensed Consolidated Balance Sheet. Supplemental Bond for Decommissioning Liabilities Trust Agreement Beta Operating Company, LLC (“Beta”), has an obligation with the BOEM in connection with its 2009 acquisition of our properties in federal waters offshore Southern California. The Company had previously supported this obligation with $71.3 million of A-rated surety bonds and $90.2 million of cash, but $90.0 million of cash was released to the Company on June 24, 2019. Following the release, Beta’s decommissioning obligations remain fully supported by $161.3 million in A-rated surety bonds and $0.3 million in cash.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 16. Income Taxes The Company had no income tax benefit/(expense) for the three months ended September 30, 2019 and had less than $0.1 million income tax benefit/(expense) for the nine months ended September 30, 2019, and no income tax benefit/(expense) for the three and nine months ended September 30, 2018. The Company’s effective tax rate was 0.0% and 0.6% for the three and nine months ended September 30, 2019, respectively, and 0.0% for the three and nine months ended September 30, 2018, respectively. The effective tax rates for the three and nine months ended September 30, 2019 and 2018 are different from the statutory U.S. federal income tax rate primarily due to our recorded valuation allowances.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
General	General On August 6, 2019, Midstates Petroleum Company, Inc. (“Midstates”) completed its business combination (the “Merger”) with Amplify Energy Corp. (“Legacy Amplify”) in accordance with the terms of that certain Agreement and Plan of Merger, dated May 5, 2019 (the “Merger Agreement”), by and among Midstates, Legacy Amplify and Midstates Holdings, Inc., a Delaware corporation and direct, wholly owned subsidiary of Midstates (“Merger Sub”). Pursuant to the terms of the Merger Agreement, Merger Sub merged with and into Legacy Amplify, with Legacy Amplify surviving the Merger as a wholly owned subsidiary of Midstates, and immediately following the Merger, Legacy Amplify merged with and into Alpha Mike Holdings LLC, a Delaware limited liability company and wholly owned subsidiary of Midstates (“LLC Sub”), with LLC Sub surviving as a wholly owned subsidiary of Midstates. On the effective date of the Merger, Midstates changed its name to “Amplify Energy Corp.” (the “Company”) and LLC Sub changed its name to “Amplify Energy Holdings LLC.” For financial reporting purposes, the Merger represented a “reverse merger” and Legacy Amplify was deemed to be the accounting acquirer in the transaction. Legacy Amplify’s historical results of operations will replace Midstates’ historical results of operations for all periods prior to the Merger and, for all periods following the Merger, the Company’s financial statements will reflect the results of operations of the combined company. Accordingly, the financial statements for the Company included in this Quarterly Report for periods prior to the Merger are not the same as Midstates prior reported filings with the SEC, which were derived from the operations of Midstates. As a result, period-to-period comparisons of our operating results may not be meaningful. The results of any one quarter should not be relied upon as an indication of future performance. We operate in one reportable segment engaged in the acquisition, development, exploitation and production of oil and natural gas properties. Our management evaluates performance based on one reportable business segment as the economic environments are not different within the operation of our oil and natural gas properties. Our assets consist primarily of producing oil and natural gas properties and are located in Oklahoma, the Rockies, federal waters offshore Southern California, East Texas / North Louisiana and South Texas. Most of our oil and natural gas properties are located in large, mature oil and natural gas reservoirs. The Company’s properties consist primarily of operated and non-operated working interests in producing and undeveloped leasehold acreage and working interests in identified producing wells.
Basis of Presentation	Basis of Presentation Our Unaudited Condensed Consolidated Financial Statements included herein have been prepared pursuant to the rules and guidelines of the Securities and Exchange Commission (the “SEC”). The results reported in these Unaudited Condensed Consolidated Financial Statements should not necessarily be taken as indicative of results that may be expected for the entire year. In our opinion, the accompanying Unaudited Condensed Consolidated Financial Statements include all adjustments of a normal recurring nature necessary for fair presentation. Although we believe the disclosures in these financial statements are adequate, certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the SEC. The Unaudited Condensed Consolidated Financial Statements have been prepared as if the Company is a going concern and reflect the application of Accounting Standards Codification 852 “Reorganizations” (“ASC 852”). ASC 852 requires that the financial statements, for periods subsequent to the Chapter 11 filing, distinguish transactions and events that are directly associated with the reorganization from the ongoing operations of the business. Accordingly, certain expenses, gains and losses that were realized or incurred in the bankruptcy proceedings are recorded in “reorganization items, net” on the Company’s Unaudited Condensed Statements of Consolidated Operations. All material intercompany transactions and balances have been eliminated in preparation of our consolidated financial statements. Beginning in 2019, the Company has elected to change its reporting convention from natural gas equivalent (Mcfe) to barrels of oil equivalent (Boe). The change in presentation reflects our liquids-weighted production and reserve profile with a balanced approach to development of our oil and natural gas asset portfolio. Legacy Amplify’s proved reserves as of year-end 2018 were 50% crude oil, 15% natural gas liquids and 35% natural gas.
Definitive Merger Agreement	Definitive Merger Agreement On May 5, 2019, as discussed above, the Company entered into the Merger Agreement pursuant to which Legacy Amplify merged with a subsidiary of Midstates in an all-stock merger-of-equals. Under the terms of the Merger Agreement, Legacy Amplify stockholders received 0.933 shares of newly issued Company common stock for each share of Legacy Amplify common stock that they owned. The Merger closed on August 6, 2019.
Use of Estimates	Use of Estimates The preparation of the accompanying Unaudited Condensed Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant estimates include, but are not limited to, oil and natural gas reserves; depreciation, depletion, and amortization of proved oil and natural gas properties; future cash flows from oil and natural gas properties; impairment of long-lived assets; fair value of derivatives; fair value of equity compensation; fair values of assets acquired and liabilities assumed in business combinations and asset retirement obligations.
Lease Recognition	Lease Recognition In February 2016, the Financial Accounting Standards Board (“FASB”) issued guidance regarding the accounting for leases. The FASB retained a dual model, requiring leases to be classified as either direct financing or operating leases. The classification will be based on criteria that are similar to the current lease accounting treatment. The Company is the lessee under various agreements for office space, compressors, equipment, vehicles and surface rentals (right of use assets) that are currently accounted for as operating leases. The Company applied the revised lease rules for our interim and annual reporting periods starting January 1, 2019 using the modified retrospective approach with a cumulative impact to retained earnings in that period, and including several optional practical expedients relating to leases commenced before the effective date. The practical expedients the Company adopted are: (1) the original correct assessment of a contract containing a lease will be accepted without further review on all existing or expired contracts; (2) the original lease classification as an operating lease will convert as an operating lease under the new guidance; (3) initial direct costs for any existing leases will not be reassessed; (4) existing land easements or right of use agreements will continue under current accounting policy and only new agreements will be evaluated in the future; and (5) short-term leases for twelve months or less will not be evaluated under the guidance. See Note 12 for additional information regarding the adoption of the leases standard.
New Accounting Pronouncements	New Accounting Pronouncements Financial Instruments — Credit Losses . In May 2019 the FASB issued an accounting standards update to provide entities with an option to irrevocably elect the fair value option applied on an instrument-by-instrument basis for certain financial assets upon the adoption. The fair value option election does not apply to held-to-maturity debt securities. The new guidance is effective for annual periods beginning after December 15, 2019, and interim periods within those annual periods. The Company notes that the impact of this guidance will not be material to the Company’s financial statements and related disclosures. Other accounting standards that have been issued by the FASB or other standards-setting bodies are not expected to have a material impact on the Company’s financial position, results of operations and cash flows.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Schedule of Reorganization Items, Net	The following table summarizes the components of reorganization items, net included in the accompanying Unaudited Condensed Statements of Consolidated Operations (in thousands): For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Professional fees 104 (14 ) (241 ) (638 ) Other (137 ) (452 ) (443 ) (1,114 ) Reorganization items, net $ (33 ) $ (466 ) $ (684 ) $ (1,752 )

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2019
Revenue From Contract With Customer [Abstract]
Summary of Revenues Disaggregated	We have identified three material revenue streams in our business: oil, natural gas and NGLs. The following table present our revenues disaggregated by revenue stream. For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 (in thousands) Revenues Oil $ 55,011 $ 52,576 $ 136,754 $ 165,843 NGLs 4,306 12,132 15,509 34,009 Natural gas 13,109 20,738 44,715 64,335 Oil and natural gas sales $ 72,426 $ 85,446 $ 196,978 $ 264,187

Acquisitions and Divestitures (

Acquisitions and Divestitures (Tables)	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Acquisition and Divestiture Related Expenses	Acquisition and divestiture related expenses for both related party and third party transactions are included in general and administrative expense in the accompanying Unaudited Condensed Statements of Consolidated Operations for the periods indicated below (in thousands): For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 $ 12,833 $ 82 $ 16,655 $ 969
Summary of Preliminary Purchase Price Allocation to Identifiable Assets Acquired and Liabilities Assumed	The following table represents the preliminary allocation of the total purchase price of Midstates to the identifiable assets acquired and the liabilities assumed based on the fair values as of the acquisition date. Purchase Price Allocation (In thousands) Consideration: Fair value of Midstates common stock issued in the Merger (a) $ 90,150 Fair value of Midstates warrants issued in the Merger 2 Total consideration $ 90,152 Fair value of liabilities assumed: Current liabilities $ 24,135 Long-term debt 76,559 Long-term asset retirement obligation 9,440 Other long-term liabilities 5,067 Amounts attributable to liabilities assumed $ 115,201 Fair value of assets acquired: Cash and cash equivalents $ 19,250 Other current assets 17,862 Oil and natural gas properties 142,642 Other property and equipment 6,280 Long-term asset retirement cost 9,440 Other non-current assets 9,879 Amounts attributable to assets acquired $ 205,353 Total identifiable net assets $ 90,152 (a) Based on 20,415,005 Midstates common shares issued at closing at $4.12 per share (closing price as of August 6, 2019).
Summary of Unaudited Pro Forma Financial Information	The following unaudited pro forma financial information for the three and nine months ended September 30, 2019 and 2018, respectively, is based on our historical consolidated financial statements adjusted to reflect as if the Merger had occurred on January 1, 2018. For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 (Unaudited) (In thousands, except per unit amounts) Revenues $ 80,482 $ 139,870 $ 258,547 $ 425,306 Net income (loss) 6,845 20,542 6,236 25,269 Earnings per share: Basic $ 0.20 $ 0.41 $ 0.24 $ 0.50 Diluted $ 0.20 $ 0.41 $ 0.24 $ 0.50

Fair Value Measurements of Fi_2

Fair Value Measurements of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table presents the gross derivative assets and liabilities that are measured at fair value on a recurring basis at September 30, 2019 and December 31, 2018 for each of the fair value hierarchy levels: Fair Value Measurements at September 30, 2019 Using Quoted Prices in Significant Other Significant Active Market Observable Inputs Unobservable Inputs (Level 1) (Level 2) (Level 3) Fair Value (In thousands) Assets: Commodity derivatives $ — $ 41,758 $ — $ 41,758 Interest rate derivatives — 307 — 307 Total assets $ — $ 42,065 $ — $ 42,065 Liabilities: Commodity derivatives $ — $ 3,584 $ — $ 3,584 Interest rate derivatives — 755 — 755 Total liabilities $ — $ 4,339 $ — $ 4,339 Fair Value Measurements at December 31, 2018 Using Quoted Prices in Significant Other Significant Active Market Observable Inputs Unobservable Inputs (Level 1) (Level 2) (Level 3) Fair Value (In thousands) Assets: Commodity derivatives $ — $ 25,515 $ — $ 25,515 Liabilities: Commodity derivatives $ — $ 4,372 $ — $ 4,372

Risk Management and Derivativ_2

Risk Management and Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Open Commodity Positions	At September 30, 2019, we had the following open commodity positions: Remaining 2019 2020 2021 2022 Natural Gas Derivative Contracts: Fixed price swap contracts: Average monthly volume (MMBtu) 1,643,333 150,000 187,500 — Weighted-average fixed price $ 2.84 $ 2.65 $ 2.56 $ — Collar contracts: Two-way collars Average monthly volume (MMBtu) — 520,000 162,500 — Weighted-average floor price $ — $ 2.64 $ 2.58 $ — Weighted-average ceiling price $ — $ 2.96 $ 2.84 $ — Three-way collars Average monthly volume (MMBtu) 202,667 76,000 — — Weighted-average ceiling price $ 3.45 $ 3.45 $ — $ — Weighted-average floor price $ 2.65 $ 2.65 $ — $ — Weighted-average sub-floor price $ 2.15 $ 2.15 $ — $ — Natural Gas Basis Swaps: PEPL basis swaps: Average monthly volume (Bbls) — 600,000 500,000 — Weighted-average fixed price $ — $ (0.46 ) $ (0.40 ) $ — Crude Oil Derivative Contracts: Fixed price swap contracts: Average monthly volume (Bbls) 180,333 153,050 116,250 30,000 Weighted-average fixed price $ 55.25 $ 57.54 $ 56.05 $ 55.32 Collar contracts: Two-way collars Average monthly volume (Bbls) 76,000 14,300 — — Weighted-average floor price $ 55.00 $ 55.00 $ — $ — Weighted-average ceiling price $ 63.85 $ 62.10 $ — $ — Three-way collars Average monthly volume (MMBtu) 61,200 30,500 — — Weighted-average ceiling price $ 63.14 $ 65.75 $ — $ — Weighted-average floor price $ 53.75 $ 50.00 $ — $ — Weighted-average sub-floor price $ 43.75 $ 40.00 $ — $ — NGL Derivative Contracts: Fixed price swap contracts: Average monthly volume (Bbls) 72,000 65,425 22,800 — Weighted-average fixed price $ 29.96 $ 25.20 $ 24.25 $ —
Interest Rate Swap Open Positions	At September 30, 2019, we had the following interest rate swap open positions: Remaining 2019 2020 2021 2022 Average Monthly Notional (in thousands) $ 125,000 $ 125,000 $ 125,000 $ 75,000 Weighted-average fixed rate 1.612 % 1.612 % 1.612 % 1.281 % Floating rate 1 Month LIBOR 1 Month LIBOR 1 Month LIBOR 1 Month LIBOR
Gross Fair Value of Derivative Instruments by Appropriate Balance Sheet	The following table summarizes both: (i) the gross fair value of derivative instruments by the appropriate balance sheet classification even when the derivative instruments are subject to netting arrangements and qualify for net presentation in the balance sheet and (ii) the net recorded fair value as reflected on the balance sheet at September 30, 2019 and December 31, 2018. There was no cash collateral received or pledged associated with our derivative instruments since most of the counterparties, or certain of their affiliates, to our derivative contracts are lenders under our credit agreement. Asset Derivatives Liability Derivatives Asset Derivatives Liability Derivatives September 30, September 30, December 31, December 31, Type Balance Sheet Location 2019 2019 2018 2018 (In thousands) Commodity contracts Short-term derivative instruments $ 23,043 $ 2,584 $ 21,217 $ 2,543 Interest rate swaps Short-term derivative instruments 275 234 — — Gross fair value 23,318 2,818 21,217 2,543 Netting arrangements (2,609 ) (2,609 ) (2,404 ) (2,404 ) Net recorded fair value Short-term derivative instruments $ 20,709 $ 209 $ 18,813 $ 139 Commodity contracts Long-term derivative instruments $ 18,715 $ 1,000 $ 4,298 $ 1,829 Interest rate swaps Long-term derivative instruments 32 521 — — Gross fair value 18,747 1,521 4,298 1,829 Netting arrangements (1,032 ) (1,032 ) (1,829 ) (1,829 ) Net recorded fair value Long-term derivative instruments $ 17,715 $ 489 $ 2,469 $ —
Unrealized and Realized Gains and Losses Related to Derivative Instruments	The following table details the gains and losses related to derivative instruments for the periods indicated (in thousands): For the Three Months Ended For the Nine Months Ended Statements of September 30, September 30, Operations Location 2019 2018 2019 2018 Commodity derivative contracts (Gain) loss on commodity derivatives $ (28,725 ) $ 21,110 $ (19,231 ) $ 67,218 Interest rate derivatives Interest expense, net (199 ) — 334 —

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]
Summary of Changes in Asset Retirement Obligations	The Company’s asset retirement obligations primarily relate to the Company’s portion of future plugging and abandonment costs for wells and related facilities. The following table presents the changes in the asset retirement obligations for the nine months ended September 30, 2019 (in thousands): Asset retirement obligations at beginning of period $ 76,344 Liabilities added from acquisition or drilling 9,477 Liabilities settled (259 ) Accretion expense 4,071 Revision of estimates (52 ) Asset retirement obligation at end of period 89,581 Less: Current portion (477 ) Asset retirement obligations - long-term portion $ 89,104

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Consolidated Debt Obligations	The following table presents our consolidated debt obligations at the dates indicated: September 30, December 31, 2019 2018 (In thousands) New Revolving Credit Facility (1) $ 278,000 $ 294,000 Long-term debt $ 278,000 $ 294,000 (1) The carrying amount of our New Revolving Credit Facility approximates fair value because the interest rates are variable and reflective of market rates.
Summary of Weighted-Average Interest Rates Paid Excluding Commitment Fees on Variable-Rate Debt Obligations	The following table presents the weighted-average interest rates paid, excluding commitment fees, on our consolidated variable-rate debt obligations for the periods presented: For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 New Revolving Credit Facility 4.89% n/a 4.99% n/a Emergence Credit Facility n/a 5.94% n/a 5.73%

Equity (Deficit) (Tables)

Equity (Deficit) (Tables)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Summary of Changes in Common Stock Issued	The following is a summary of the changes in our common stock issued for the nine months ended September 30, 2019: Common Shares Balance, December 31, 2018 22,181,881 Issuance of common stock — Restricted stock units vested 412,938 Repurchase of common shares (120,163 ) Common stock repurchased and retired under share repurchase program (169,400 ) Balance, June 30, 2019 22,305,256 Restricted stock units vested 38,181 Repurchase of common shares (9,427 ) Balance, August 5, 2019 22,334,010 Ratio to convert Amplify shares 0.933 Common stock issued to Legacy Amplify stockholders 20,837,633 Midstates stock outstanding and acquired with the Merger 20,415,005 Treasury shares acquired from the Merger 205,861 Restricted stock units vested 602,053 Repurchase of common shares (11,740 ) Common stock repurchased and retired under share repurchase program (1,723,146 ) Cancelation and retirement of shares (347,567 ) Balance, September 30, 2019 39,978,099

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Calculation of Earnings (Loss) per Share	The following sets forth the calculation of earnings (loss) per share, or EPS, for the periods indicated (in thousands, except per share amounts): For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Net income (loss) $ 5,157 $ (2,598 ) $ (7,679 ) $ (24,638 ) Less: Net income allocated to participating restricted stockholders 128 — — — Basic and diluted earnings available to common stockholders $ 5,029 $ (2,598 ) $ (7,679 ) $ (24,638 ) Common shares/units: Common shares outstanding — basic 33,707 25,073 26,093 25,037 Dilutive effect of potential common shares — — — — Common shares outstanding — diluted 33,707 25,073 26,093 25,037 Net earnings per share: Basic $ 0.15 $ (0.10 ) $ (0.29 ) $ (0.98 ) Diluted $ 0.15 $ (0.10 ) $ (0.29 ) $ (0.98 ) Antidilutive stock options (1) 3 116 3 116 Antidilutive warrants (2) 9,154 2,174 9,154 2,174 (1) Amount represents options to purchase common stock that are excluded from the diluted net earnings per share calculations because of their antidilutive effect. (2) Amount represents warrants to purchase common stock that are excluded from the diluted net earnings per share calculations because of their antidilutive effect.

Long-Term Incentive Plans (Tabl

Long-Term Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Information Regarding Restricted Stock Unit Awards	The following table summarizes the Midstates non-vested restricted stock unit award activity for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) Midstates non-vested restricted stock units outstanding at August 6, 2019 353,464 $ 12.25 Granted — $ — Forfeited — $ — Vested (327,802 ) $ 12.02 Midstates non-vested restricted stock units outstanding at September 30, 2019 25,662 $ 15.23
Summary of Amount of Compensation Expense Recognized	The following table summarizes the amount of recognized compensation expense associated with the MIP and Directors Compensation Plan, which are reflected in the accompanying Unaudited Condensed Statements of Consolidated Operations for the periods presented (in thousands): For the Three Months Ended For the Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Equity classified awards TSUs $ 650 $ 490 $ 1,852 $ 601 PSUs 120 495 825 747 Board RSUs 58 44 221 98 Restricted stock options — 39 — 115 $ 828 $ 1,068 $ 2,898 $ 1,561
Summary of Non-vested Stock Option Activity	The following table summarizes the Midstates 2016 LTIP non-vested stock option activity for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) Midstates stock options outstanding at August 6, 2019 54,365 $ 19.68 Granted — $ — Forfeited — $ — Vested (50,870 ) $ 19.68 Midstates stock options outstanding at September 30, 2019 3,495 $ 19.66
2017 Non-Employee Directors Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Information Regarding Restricted Stock Unit Awards	The following table summarizes information regarding the Board RSUs granted under the Directors Compensation Plan for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) Board RSUs outstanding at December 31, 2018 36,955 $ 11.36 Granted (2) 40,060 $ 6.95 Forfeited — $ — Vested (46,396 ) $ 9.54 Board RSUs outstanding at September 30, 2019 30,619 $ 8.35 (1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued. (2) The aggregate grant date fair value of Board RSUs issued for the nine months ended September 30, 2019 was $0.3 million based on grant date market price of $6.95 per share.
TSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Information Regarding Restricted Stock Unit Awards	The following table summarizes information regarding the TSUs granted under the MIP for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) TSUs outstanding at December 31, 2018 557,963 $ 11.41 Granted (2) 280,416 $ 6.80 Forfeited (35,596 ) $ 11.13 Vested (444,142 ) $ 9.01 TSUs outstanding at September 30, 2019 358,641 $ 10.71 (1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued. (2) The aggregate grant date fair value of TSUs issued for the nine months ended September 30, 2019 was $1.9 million based on a grant date market price ranging from $4.48 to $8.70 per share.
PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Information Regarding Restricted Stock Unit Awards	The following table summarizes information regarding the PSUs granted under the MIP for the period presented: Weighted- Average Grant Number of Date Fair Value Units per Unit (1) PSUs outstanding at December 31, 2018 367,141 $ 8.14 Granted (2) 16,562 $ 4.06 Forfeited (44,552 ) $ 7.59 Vested — $ — PSUs outstanding at September 30, 2019 339,151 $ 8.01 (1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued. (2) The aggregate grant date fair value of PSUs issued for the nine months ended September 30, 2019 was less than $0.1 million based on a calculated fair value price ranging from $1.64 to $6.76 per share.
Schedule of Fair Value Assumptions for PSUs	A Monte Carlo simulation was used in order to determine the fair value of these awards at the grant date. The assumptions used to estimate the fair value of the PSUs are as follows: Share price targets $ 12.50 $ 15.00 $ 17.50 Risk-free interest rate: Awards Issued on January 1, 2019 2.44 % 2.44 % 2.44 % Awards Issued on April 1, 2019 2.28 % 2.28 % 2.28 % Awards Issued on July 1, 2019 1.73 % 1.73 % 1.73 % Dividend yield — — — Expected volatility: Awards Issued on January 1, 2019 54.0 % 54.0 % 54.0 % Awards Issued on April 1, 2019 50.0 % 50.0 % 50.0 % Awards Issued on July 1, 2019 57.0 % 57.0 % 57.0 % Calculated fair value per PSU: Awards Issued on January 1, 2019 $ 6.76 $ 5.86 $ 5.11 Awards Issued on April 1, 2019 $ 4.22 $ 3.43 $ 2.80 Awards Issued on July 1, 2019 $ 2.63 $ 2.05 $ 1.64

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Schedule of Right-of-Use Assets and Lease Liabilities	The following table presents the Company’s right-of-use assets and lease liabilities as of September 30, 2019. September 30, 2019 (In thousands) Right-of-use asset $ 4,925 Lease liabilities: Current lease liability 1,732 Long-term lease liability 3,214 Total lease liability $ 4,946
Schedule of Maturity Analysis of Minimum Lease Payment Obligation Under Non-cancellable Operating Leases	The following table reflects the Company’s maturity analysis of the minimum lease payment obligations under non-cancelable operating leases with a remaining term in excess of one year (in thousands): Office leases Leased vehicles and office equipment Total Remaining 2019 $ 399 $ 175 $ 574 2020 1,231 537 1,768 2021 1,727 627 2,354 2022 and thereafter 411 119 530 Total lease payments $ 3,768 $ 1,458 $ 5,226 Less: interest $ 220 $ 60 $ 280 Present value of lease liabilities $ 3,548 $ 1,398 $ 4,946
Schedule of Future Contractual Payment for Operating Leases	The following is a schedule of the Company’s future contractual payment for operating leases prepared in accordance with accounting standards prior to the adoption of ASC 842, as of December 31, 2018 (in thousands): Payment or Settlement Due by Period Operating leases Total 2019 2020 2021 2022 2023 Thereafter Operating leases $ 11,846 $ 5,893 $ 2,072 $ 2,109 $ 337 $ 205 $ 1,230
Schedule of Weighted Average Remaining Lease Terms and Discount Rate of Operating Leases	The weighted average remaining lease terms and discount rate for all of our operating leases were as follow as of September 30, 2019: September 30, 2019 Weighted average remaining lease term (years): Office leases 1.67 Vehicles 0.53 Office equipment 0.09 Weighted average discount rate: Office leases 3.61 % Vehicles 0.85 % Office equipment 0.18 %

Supplemental Disclosures to t_2

Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows (Tables)	9 Months Ended
	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Summary of Current Accrued Liabilities	Current accrued liabilities consisted of the following at the dates indicated (in thousands): September 30, December 31, 2019 2018 Accrued lease operating expense $ 11,561 $ 10,469 Accrued capital expenditures 5,448 4,349 Accrued general and administrative expense 4,459 4,393 Accrued ad valorem tax 2,541 729 Operating lease liability 1,732 — Asset retirement obligations 477 477 Accrued interest payable 38 2,476 Other 71 262 Accrued liabilities $ 26,327 $ 23,155
Summary of Cash and Cash Equivalents Reconciliation	The following table provides a reconciliation of cash and cash equivalents on the Unaudited Condensed Consolidated Balance Sheet to cash, cash equivalents and restricted cash on the Unaudited Condensed Statements of Consolidated Cash Flows (in thousands): September 30, December 31, 2019 2018 Cash and cash equivalents $ 7,408 $ 49,704 Restricted cash 325 325 Total cash, cash equivalents and restricted cash $ 7,733 $ 50,029
Summary of Supplemental Cash Flows	Supplemental cash flows for the periods presented (in thousands): For the Nine Months Ended September 30, 2019 2018 Supplemental cash flows: Cash paid for interest, net of amounts capitalized $ 12,477 $ 15,405 Cash paid for reorganization items, net 684 2,004 Noncash investing and financing activities: Increase (decrease) in capital expenditures in payables and accrued liabilities 324 (565 ) Assets acquired & liabilities assumed in the Merger: Accounts receivable 14,633 — Prepaids and other current assets 3,229 — Other non-current assets 9,879 Oil and natural gas properties 142,642 — Other property and equipment 6,280 Accounts payable and accrued liabilities (24,135 ) — Other non-current liabilities (5,067 ) — Long-term debt (76,559 ) — Issuance of common stock in connection with the Merger 90,150 —

Organization and Basis of Pre_3

Organization and Basis of Presentation - Additional Information (Detail)	May 05, 2019shares	Sep. 30, 2019shares	Sep. 30, 2019Segment	Dec. 31, 2018
Consolidation And Basis Of Presentation [Line Items]
Number of reportable business segments | Segment			1
Number of common stock share for each share		0.933
Legacy Amplify [Member]
Consolidation And Basis Of Presentation [Line Items]
Number of common stock share for each share	0.933
Crude Oil Reserves [Member]
Consolidation And Basis Of Presentation [Line Items]
Proved reserves				50.00%
Natural Gas Reserves [Member]
Consolidation And Basis Of Presentation [Line Items]
Proved reserves				35.00%
Natural Gas Liquids Reserves [Member]
Consolidation And Basis Of Presentation [Line Items]
Proved reserves				15.00%

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Schedule of Reorganization Items, net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Professional fees	$ 104	$ (14)	$ (241)	$ (638)
Other	(137)	(452)	(443)	(1,114)
Reorganization items, net	$ (33)	$ (466)	$ (684)	$ (1,752)

Revenue - Summary of Revenues D

Revenue - Summary of Revenues Disaggregated (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 72,959	$ 85,522	$ 197,646	$ 264,442
Oil and Natural Gas Sales [Member]
Revenues:
Total revenues	72,426	85,446	196,978	264,187
Oil [Member]
Revenues:
Total revenues	55,011	52,576	136,754	165,843
NGLs [Member]
Revenues:
Total revenues	4,306	12,132	15,509	34,009
Natural Gas [Member]
Revenues:
Total revenues	$ 13,109	$ 20,738	$ 44,715	$ 64,335

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Accounts receivable attributable to revenue contracts with customers	$ 28.2	$ 25

Acquisitions and Divestitures -

Acquisitions and Divestitures - Acquisition and Divestiture Related Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
General and Administrative Expense [Member]
Business Acquisition [Line Items]
Business Acquisition and Divestiture, Related Expenses	$ 12,833	$ 82	$ 16,655	$ 969

Acquisitions and Divestitures_2

Acquisitions and Divestitures - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	May 05, 2019	May 30, 2018	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Business Acquisition And Divestiture [Line Items]
Merger conversion ratio			0.933
Common stock par value per share			$ 0.01		$ 0.0001
Measurement period adjustment amount of increase asset retirement obligations liability			$ 89,581		$ 76,344
Operating lease - long term right-of-use asset			4,925		$ 0
Operating Liabilities			4,946
Disposal Group Not Discontinued Operation [Member] | South Texas Divestiture [Member]
Business Acquisition And Divestiture [Line Items]
Total net proceeds from divestitures		$ 17,100
ASU 2016-02 [Member]
Business Acquisition And Divestiture [Line Items]
Operating lease - long term right-of-use asset				$ 5,400
Operating Liabilities				$ 5,400
Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member]
Business Acquisition And Divestiture [Line Items]
Merger conversion ratio	0.933
Common stock par value per share	$ 0.01
Measurement period adjustment amount of increase asset retirement obligations liability			900
Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member] | ASU 2016-02 [Member]
Business Acquisition And Divestiture [Line Items]
Operating lease - long term right-of-use asset			300
Operating Liabilities			300
Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member] | Oklahoma Properties [Member]
Business Acquisition And Divestiture [Line Items]
Business acquisition, revenues			12,700
Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member] | Direct Operating Expense [Member] | Oklahoma Properties [Member]
Business Acquisition And Divestiture [Line Items]
Business acquisition, expenses			17,700
Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member] | Other Expenses [Member] | Oklahoma Properties [Member]
Business Acquisition And Divestiture [Line Items]
Business acquisition, expenses			$ 200

Acquisitions and Divestitures_3

Acquisitions and Divestitures - Summary of Purchase Price Allocation (Detail) - Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member] $ in Thousands	Aug. 06, 2019USD ($)
Consideration:
Fair value of Midstates common stock issued in the Merger (a)	$ 90,150
Fair value of Midstates warrants issued in the Merger	2
Total consideration	90,152
Fair value of liabilities assumed:
Current liabilities	24,135
Long-term debt	76,559
Long-term asset retirement obligation	9,440
Other long-term liabilities	5,067
Amounts attributable to liabilities assumed	115,201
Fair value of assets acquired:
Cash and cash equivalents	19,250
Other current assets	17,862
Oil and natural gas properties	142,642
Other property and equipment	6,280
Long-term asset retirement cost	9,440
Other non-current assets	9,879
Amounts attributable to assets acquired	205,353
Total identifiable net assets	$ 90,152

Acquisitions and Divestitures_4

Acquisitions and Divestitures - Summary of Purchase Price Allocation (Parenthetical) (Detail) - Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member]	Aug. 06, 2019$ / sharesshares
Business Acquisition [Line Items]
Business acquisition, common shares issued | shares	20,415,005
Business acquisition, share price | $ / shares	$ 4.12

Acquisitions and Divestitures_5

Acquisitions and Divestitures - Summary of Unaudited Pro Forma Financial Information (Detail) - Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Revenues	$ 80,482	$ 139,870	$ 258,547	$ 425,306
Net income (loss)	$ 6,845	$ 20,542	$ 6,236	$ 25,269
Earnings per share:
Basic	$ 0.20	$ 0.41	$ 0.24	$ 0.50
Diluted	$ 0.20	$ 0.41	$ 0.24	$ 0.50

Fair Value Measurements of Fi_3

Fair Value Measurements of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	$ 42,065
Total liabilities	4,339
Quoted Prices in Active Market (Level 1) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	0
Total liabilities	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	42,065
Total liabilities	4,339
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	0
Total liabilities	0
Commodity derivatives [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	41,758	$ 25,515
Total liabilities	3,584	4,372
Commodity derivatives [Member] | Quoted Prices in Active Market (Level 1) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	0	0
Total liabilities	0	0
Commodity derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	41,758	25,515
Total liabilities	3,584	4,372
Commodity derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	0	0
Total liabilities	0	$ 0
Interest rate derivatives [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	307
Total liabilities	755
Interest rate derivatives [Member] | Quoted Prices in Active Market (Level 1) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	0
Total liabilities	0
Interest rate derivatives [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	307
Total liabilities	755
Interest rate derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total assets	0
Total liabilities	$ 0

Fair Value Measurements of Fi_4

Fair Value Measurements of Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Impairment of proved oil and natural gas properties	$ 0	$ 0	$ 0	$ 0

Risk Management and Derivativ_3

Risk Management and Derivative Instruments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019USD ($)
Derivative Instruments Gain Loss [Line Items]
Conditional rights of set-off under ISDA Master Agreement reduce the maximum amount of loss due to credit risk	$ 36,600,000
Maximum credit exposure	1,400,000
One Counterparty [Member]
Derivative Instruments Gain Loss [Line Items]
Maximum credit exposure	$ 1,200,000

Risk Management and Derivativ_4

Risk Management and Derivative Instruments - Open Commodity Positions (Detail)	9 Months Ended
	Sep. 30, 2019MMBTU$ / MMBTU$ / bblbbl
Natural Gas Derivative Contracts Fixed Price Swap 2022 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average fixed price | $ / MMBTU	0
Natural Gas Derivative Two Way Collars Contracts 2022 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average floor price	0
Weighted-average ceiling price	0
Crude Oil Derivative Contracts Fixed Price Swap 2022 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	30,000
Weighted-average fixed price	55.32
Natural Gas Derivative Three Way Collars Contracts 2022 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average floor price	0
Weighted-average ceiling price	0
Weighted-average sub-floor price	0
Crude Oil Derivative Two Way Collars Contracts 2022 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average floor price	0
Weighted-average ceiling price	0
Natural Gas PEPL Basis Swaps 2022 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	0
Weighted-average fixed price	0
NGL Derivative Contracts Fixed Price Swap 2022 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	0
Weighted-average fixed price	0
Crude Oil Derivative Three Way Collars Contracts 2022 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average floor price	0
Weighted-average ceiling price	0
Weighted-average sub-floor price	0
Natural Gas Derivative Contracts Fixed Price Swap 2021 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	187,500
Weighted-average fixed price | $ / MMBTU	2.56
Natural Gas Derivative Two Way Collars Contracts 2021 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	162,500
Weighted-average floor price	2.58
Weighted-average ceiling price	2.84
Crude Oil Derivative Contracts Fixed Price Swap 2021 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	116,250
Weighted-average fixed price	56.05
Natural Gas Derivative Three Way Collars Contracts 2021 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average floor price	0
Weighted-average ceiling price	0
Weighted-average sub-floor price	0
Crude Oil Derivative Two Way Collars Contracts 2021 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average floor price	0
Weighted-average ceiling price	0
Natural Gas PEPL Basis Swaps 2021 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	500,000
Weighted-average fixed price	(0.40)
NGL Derivative Contracts Fixed Price Swap 2021 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	22,800
Weighted-average fixed price	24.25
Crude Oil Derivative Two Way Collars Contracts 2021 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average floor price	0
Weighted-average ceiling price	0
Weighted-average sub-floor price	0
Natural Gas Derivative Contracts Fixed Price Swap 2020 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	150,000
Weighted-average fixed price | $ / MMBTU	2.65
Natural Gas Derivative Two Way Collars Contracts 2020 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	520,000
Weighted-average floor price	2.64
Weighted-average ceiling price	2.96
Crude Oil Derivative Contracts Fixed Price Swap 2020 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	153,050
Weighted-average fixed price	57.54
Natural Gas Derivative Three Way Collars Contracts 2020 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	76,000
Weighted-average floor price	2.65
Weighted-average ceiling price	3.45
Weighted-average sub-floor price	2.15
Crude Oil Derivative Two Way Collars Contracts 2020 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	14,300
Weighted-average floor price	55
Weighted-average ceiling price	62.10
Natural Gas PEPL Basis Swaps 2020 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	600,000
Weighted-average fixed price	(0.46)
NGL Derivative Contracts Fixed Price Swap 2020 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	65,425
Weighted-average fixed price	25.20
Crude Oil Derivative Three Way Collars Contracts 2020 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	30,500
Weighted-average floor price	50
Weighted-average ceiling price	65.75
Weighted-average sub-floor price	40
Natural Gas Derivative Contracts Fixed Price Swap Remaining 2019 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	1,643,333
Weighted-average fixed price | $ / MMBTU	2.84
Natural Gas Derivative Two Way Collars Contracts Remaining 2019 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	0
Weighted-average floor price	0
Weighted-average ceiling price	0
Crude Oil Derivative Contracts Fixed Price Swap Remaining 2019 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	180,333
Weighted-average fixed price	55.25
Natural Gas Derivative Three Way Collars Contracts Remaining 2019 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	202,667
Weighted-average floor price	2.65
Weighted-average ceiling price	3.45
Weighted-average sub-floor price	2.15
Crude Oil Derivative Two Way Collars Contracts Remaining 2019 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	76,000
Weighted-average floor price	55
Weighted-average ceiling price	63.85
Natural Gas PEPL Basis Swaps 2019 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	0
Weighted-average fixed price	0
NGL Derivative Contracts Fixed Price Swap Remaining 2019 [Member]
Derivative [Line Items]
Average monthly volume (Bbls) | bbl	72,000
Weighted-average fixed price	29.96
Crude Oil Derivative Three Way Collars Contracts Remaining 2019 [Member]
Derivative [Line Items]
Average monthly volume (MMBtu) | MMBTU	61,200
Weighted-average floor price	53.75
Weighted-average ceiling price	63.14
Weighted-average sub-floor price	43.75

Risk Management and Derivativ_5

Risk Management and Derivative Instruments - Interest Rate Swap Open Positions (Detail)	9 Months Ended
	Sep. 30, 2019USD ($)
Interest Rate Swap Open Position Remaining 2019 [Member]
Derivative [Line Items]
Average Monthly Notional (in thousands)	$ 125,000,000
Weighted-average fixed rate	1.612%
Floating rate	1 Month LIBOR
Interest Rate Swap Open Position 2020 [Member]
Derivative [Line Items]
Average Monthly Notional (in thousands)	$ 125,000,000
Weighted-average fixed rate	1.612%
Floating rate	1 Month LIBOR
Interest Rate Swap Open Position 2021 [Member]
Derivative [Line Items]
Average Monthly Notional (in thousands)	$ 125,000,000
Weighted-average fixed rate	1.612%
Floating rate	1 Month LIBOR
Interest Rate Swap Open Position 2022 [Member]
Derivative [Line Items]
Average Monthly Notional (in thousands)	$ 75,000,000
Weighted-average fixed rate	1.281%
Floating rate	1 Month LIBOR

Risk Management and Derivativ_6

Risk Management and Derivative Instruments - Gross Fair Value of Derivative Instruments by Appropriate Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative Instruments and Hedges, Assets [Abstract]
Asset Derivatives, Net recorded fair value	$ 20,709	$ 18,813
Asset Derivatives, Net recorded fair value	17,715	2,469
Liability Derivatives, Net recorded fair value	209	139
Liability Derivatives, Net recorded fair value	489	0
Short-Term Derivative Instruments [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Asset Derivatives, Gross fair value	23,318	21,217
Asset Derivatives, Netting arrangements	(2,609)	(2,404)
Asset Derivatives, Net recorded fair value	20,709	18,813
Liability Derivatives, Gross fair value	2,818	2,543
Liability Derivatives, Netting arrangements	(2,609)	(2,404)
Liability Derivatives, Net recorded fair value	209	139
Short-Term Derivative Instruments [Member] | Commodity derivatives [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Asset Derivatives, Gross fair value	23,043	21,217
Liability Derivatives, Gross fair value	2,584	2,543
Short-Term Derivative Instruments [Member] | Interest Rate Swaps [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Asset Derivatives, Gross fair value	275	0
Liability Derivatives, Gross fair value	234	0
Long-Term Derivative Instruments [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Asset Derivatives, Gross fair value	18,747	4,298
Asset Derivatives, Netting arrangements	(1,032)	(1,829)
Asset Derivatives, Net recorded fair value	17,715	2,469
Liability Derivatives, Gross fair value	1,521	1,829
Liability Derivatives, Netting arrangements	(1,032)	(1,829)
Liability Derivatives, Net recorded fair value	489	0
Long-Term Derivative Instruments [Member] | Commodity derivatives [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Asset Derivatives, Gross fair value	18,715	4,298
Liability Derivatives, Gross fair value	1,000	1,829
Long-Term Derivative Instruments [Member] | Interest Rate Swaps [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Asset Derivatives, Gross fair value	32	0
Liability Derivatives, Gross fair value	$ 521	$ 0

Risk Management and Derivativ_7

Risk Management and Derivative Instruments - Unrealized and Realized Gains and Losses Related to Derivative Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments Gain Loss [Line Items]
(Gain) loss on commodity derivative instruments	$ (28,725)	$ 21,110	$ (19,231)	$ 67,218
Interest expense, net	(5,276)	(5,336)	(13,787)	(17,395)
Commodity derivatives [Member]
Derivative Instruments Gain Loss [Line Items]
(Gain) loss on commodity derivative instruments	(28,725)	21,110	(19,231)	67,218
Interest rate derivatives [Member]
Derivative Instruments Gain Loss [Line Items]
Interest expense, net	$ (199)	$ 0	$ 334	$ 0

Asset Retirement Obligations -

Asset Retirement Obligations - Summary of Changes in Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligations at beginning of period			$ 76,344
Liabilities added from acquisition or drilling			9,477
Liabilities settled			(259)
Accretion expense	$ 1,428	$ 1,272	4,071	$ 4,419
Revision of estimates			(52)
Asset retirement obligation at end of period	89,581		89,581
Less: Current portion	(477)		(477)		$ (477)
Asset retirement obligations - long-term portion	$ 89,104		$ 89,104		$ 75,867

Long-Term Debt - Consolidated D

Long-Term Debt - Consolidated Debt Obligations (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Line Of Credit Facility [Line Items]
Long-term debt	$ 278,000	$ 294,000
New Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Aggregate principal outstanding	$ 278,000	$ 294,000

Long-Term Debt - Credit Facilit

Long-Term Debt - Credit Facility - Additional Information (Detail) - USD ($)	Jun. 24, 2019	Sep. 30, 2019	Aug. 06, 2019	Aug. 05, 2019	Dec. 31, 2018	Sep. 30, 2018
Line Of Credit Facility [Line Items]
Proceeds from Beta Decommissioning Trust account	$ 90,000,000	$ 0
Letters of credit outstanding		1,700,000
New Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Borrowing base		$ 530,000,000
Maturity date		Nov. 2, 2023
Borrowing base			$ 530,000,000	$ 425,000,000
Proceeds from Beta Decommissioning Trust account	$ 90,000,000
Revolving credit facility		$ 278,000,000			$ 294,000,000
Emergence Credit Facility [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility						$ 1,000,000,000

Long-Term Debt - Summary of Wei

Long-Term Debt - Summary of Weighted-Average Interest Rates Paid Excluding Commitment Fees on Variable-Rate Debt Obligations (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
New Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility, weighted-average interest rates	4.89%		4.99%
Emergence Credit Facility [Member]
Line Of Credit Facility [Line Items]
Revolving credit facility, weighted-average interest rates		5.94%		5.73%

Long-Term Debt - Unamortized De

Long-Term Debt - Unamortized Deferred Financing Costs - Additional Information (Detail) $ in Millions	Sep. 30, 2019USD ($)
New Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Unamortized deferred financing costs	$ 5

Equity (Deficit)- Additional In

Equity (Deficit)- Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Sep. 18, 2019	Aug. 06, 2019	May 04, 2017	Sep. 30, 2019	Jun. 30, 2019	Aug. 05, 2019	Dec. 31, 2018	Dec. 21, 2018
Equity And Distributions [Line Items]
Common stock, shares authorized				300,000,000			300,000,000
Common stock, par value				$ 0.01			$ 0.0001
Treasury shares outstanding				0
Warrants outstanding				9,153,522			2,173,913
Warrant expiry date						Apr. 21, 2020
Shares repurchased during period				1,773,146
Total cost of share repurchase				$ 10.4
Average price per share repurchased				$ 5.81
Dividends declared per share		$ 0.20
Dividends paid	$ 8.2
Dividend declared date		Aug. 6, 2019
Dividend payable record date		Sep. 4, 2019
Maximum [Member]
Equity And Distributions [Line Items]
Stock repurchase authorized amount		$ 25
Midstates [Member]
Equity And Distributions [Line Items]
Treasury shares outstanding						205,861
Common Stock [Member]
Equity And Distributions [Line Items]
Stock repurchase authorized amount								$ 25
Shares repurchased during period					169,400
Average common stock price					$ 7.35
Total cost of share repurchase					$ 1.3
Warrants [Member]
Equity And Distributions [Line Items]
Warrant life period			5 years
Percentage of common shares to be issued upon exercise of warrants			8.00%
Warrant issued during period			2,173,913
Warrant exercise price			$ 42.60
Third Lien Notes Warrants [Member]
Equity And Distributions [Line Items]
Warrant exercise price						$ 22.78
Warrants outstanding						4,647,520
Unsecured Creditor Warrants [Member]
Equity And Distributions [Line Items]
Warrant exercise price						$ 43.67
Warrants outstanding						2,332,089

Equity (Deficit) - Summary of C

Equity (Deficit) - Summary of Changes in Number of Outstanding Common Units and Shares of Common Stock (Detail) - shares	1 Months Ended	2 Months Ended	6 Months Ended	9 Months Ended
	Aug. 05, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2019
Equity [Abstract]
Balance	22,305,256	22,334,010	22,181,881	22,181,881
Issuance of common stock			0
Ratio to convert Amplify shares		0.933
Common stock issued to Legacy Amplify stockholders		20,837,633		20,837,633
Midstates stock outstanding and acquired with Merger		20,415,005
Treasury shares acquired from the Merger		205,861
Restricted stock units vested	38,181	602,053	412,938
Repurchase of common shares	(9,427)	(11,740)	(120,163)
Common stock repurchased and retired under share repurchase program		(1,723,146)	(169,400)
Cancelation and retirement of shares		(347,567)
Balance	22,334,010	39,978,099	22,305,256	39,978,099

Earnings per Share - Calculatio

Earnings per Share - Calculation of Earnings (Loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Line Items]
Net income (loss)		$ 5,157	$ 18,641	$ (31,477)	$ (2,598)	$ (25,279)	$ 3,239	$ (7,679)	$ (24,638)
Less: Net income allocated to participating restricted stockholders		128			0			0	0
Net income (loss) attributable to common stockholders		$ 5,029			$ (2,598)			$ (7,679)	$ (24,638)
Common shares/units:
Common shares outstanding — basic		33,707			25,073			26,093	25,037
Dilutive effect of potential common shares		0			0			0	0
Common shares outstanding — diluted		33,707			25,073			26,093	25,037
Net earnings per share:
Basic		$ 0.15			$ (0.10)			$ (0.29)	$ (0.98)
Diluted		$ 0.15			$ (0.10)			$ (0.29)	$ (0.98)
Stock Options [Member]
Net earnings per share:
Antidilutive stock options or warrants	[1]	3			116			3	116
Warrants [Member]
Net earnings per share:
Antidilutive stock options or warrants	[2]	9,154			2,174			9,154	2,174
[1]	Amount represents options to purchase common stock that are excluded from the diluted net earnings per share calculations because of their antidilutive effect.
[2]	Amount represents warrants to purchase common stock that are excluded from the diluted net earnings per share calculations because of their antidilutive effect.

Long-Term Incentive Plans - Add

Long-Term Incentive Plans - Additional Information (Detail) - USD ($)

Aug. 05, 2019

Mar. 07, 2019

Mar. 01, 2018

Nov. 01, 2017

Nov. 23, 2016

Aug. 05, 2019

Sep. 30, 2019

Jun. 30, 2019

Sep. 30, 2019

Dec. 31, 2018

Jun. 30, 2017

May 31, 2017

Oct. 21, 2016

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares vested

38,181

602,053

412,938

TSUs [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Unrecognized compensation cost

$ 3,200,000

$ 3,200,000

Weighted-average period of unrecognized compensation cost

1 year 7 months 6 days

PSUs [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Unrecognized compensation cost

$ 600,000

$ 600,000

Weighted-average period of unrecognized compensation cost

1 year 2 months 12 days

Decrease in share targets

$ 0.25

Shares outstanding

25,662

25,662

PSUs [Member] | Market Vesting Date [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock units vesting percentage

50.00%

PSUs [Member] | First Anniversary Market-Vesting Date [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock units vesting percentage

25.00%

PSUs [Member] | Second Anniversary Market-Vesting Date [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock units vesting percentage

25.00%

Restricted Stock Units (RSUs) [Member] | Non-Employee Director [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Trailing average share price period based on common stock

60 days

Restricted Stock Units (RSUs) [Member] | Non-Employee Director [Member] | Minimum [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Market Price Hurdle

$ 30

Restricted Stock Units (RSUs) [Member] | CEO [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares outstanding

135,778

135,778

0

0

Shares vested

135,778

0

Shares granted

135,778

Vesting percent, actual TSR

50.00%

Days considered for calculation of average stock price

20 days

Vesting percent, relative TSR

50.00%

Restricted Stock Units (RSUs) [Member] | CEO [Member] | Maximum [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Stock units vesting percentage

120.00%

Restricted Stock Units (RSUs) [Member] | Market Condition Awards [Member] | Non-Employee Director [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares outstanding

50,864

50,864

0

0

Shares vested

50,864

0

Share-based payment arrangement, unrecognized stock-based compensation expense

$ 0

$ 0

2018 Performance Stock Units [Member] | Executive Management [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares granted

96,305

Midstates 2018 Performance Stock Units

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares outstanding

0

0

Shares vested

96,305

Midstates 2019 Performance Stock Units

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares outstanding

0

0

Shares vested

193,921

Shares granted

193,921

Management Incentive Plan [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Aggregate shares of common stock reserved for issuance

2,166,803

Management Incentive Plan [Member] | TSUs [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares outstanding

358,641

358,641

557,963

Shares vested

444,142

Shares granted

[1]

280,416

Management Incentive Plan [Member] | PSUs [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares outstanding

339,151

339,151

367,141

Shares vested

0

Shares granted

[2]

16,562

2017 Non-Employee Directors Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Aggregate shares of common stock reserved for issuance

186,600

Unrecognized compensation cost

$ 400,000

$ 400,000

Weighted-average period of unrecognized compensation cost

2 years 1 month 6 days

Shares outstanding

30,619

30,619

36,955

Shares vested

46,396

Shares granted

[3]

40,060

Midstates 2016 Long Term Incentive Plan [Member] | PSUs [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Aggregate shares of common stock reserved for issuance

3,513,950

Midstates 2016 Long Term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Shares outstanding

353,464

353,464

25,662

25,662

Shares vested

327,802

Shares granted

0

Midstates 2016 Long Term Incentive Plan [Member] | Stock Options [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Options outstanding

3,495

3,495

Vesting period

3 years

Expiration period

10 years

[1]

The aggregate grant date fair value of TSUs issued for the nine months ended September 30, 2019 was $1.9 million based on a grant date market price ranging from $4.48 to $8.70 per share.

[2]

The aggregate grant date fair value of PSUs issued for the nine months ended September 30, 2019 was less than $0.1 million based on a calculated fair value price ranging from $1.64 to $6.76 per share.

[3]

The aggregate grant date fair value of Board RSUs issued for the nine months ended September 30, 2019 was $0.3 million based on grant date market price of $6.95 per share.

Long-Term Incentive Plans - Sum

Long-Term Incentive Plans - Summary of Information Regarding Restricted Stock Unit Awards (Detail) - $ / shares		1 Months Ended	2 Months Ended	6 Months Ended	9 Months Ended
		Aug. 05, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested, Number of Units		(38,181)	(602,053)	(412,938)
PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of Units, Ending Balance			25,662		25,662
Management Incentive Plan [Member] | TSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of Units, Beginning Balance				557,963	557,963
Granted, Number of Units	[1]				280,416
Forfeited, Number of Units					(35,596)
Vested, Number of Units					(444,142)
Outstanding, Number of Units, Ending Balance			358,641		358,641
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance	[2]			$ 11.41	$ 11.41
Granted, Weighted-Average Grant Date Fair Value per Unit	[2]				6.80
Forfeited, Weighted-Average Grant Date Fair Value per Unit	[2]				11.13
Vested, Weighted-Average Grant Date Fair Value per Unit	[2]				9.01
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance	[2]		$ 10.71		$ 10.71
Management Incentive Plan [Member] | PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of Units, Beginning Balance				367,141	367,141
Granted, Number of Units	[3]				16,562
Forfeited, Number of Units					(44,552)
Vested, Number of Units					0
Outstanding, Number of Units, Ending Balance			339,151		339,151
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance	[2]			$ 8.14	$ 8.14
Granted, Weighted-Average Grant Date Fair Value per Unit	[2],[3]				4.06
Forfeited, Weighted-Average Grant Date Fair Value per Unit	[2]				7.59
Vested, Weighted-Average Grant Date Fair Value per Unit	[2]				0
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance	[2]		$ 8.01		$ 8.01
[1]	The aggregate grant date fair value of TSUs issued for the nine months ended September 30, 2019 was $1.9 million based on a grant date market price ranging from $4.48 to $8.70 per share.
[2]	Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.
[3]	The aggregate grant date fair value of PSUs issued for the nine months ended September 30, 2019 was less than $0.1 million based on a calculated fair value price ranging from $1.64 to $6.76 per share.

Long-Term Incentive Plans - S_2

Long-Term Incentive Plans - Summary of Information Regarding Restricted Stock Unit Awards (Parenthetical) (Detail) $ / shares in Units, $ in Millions	Sep. 30, 2019USD ($)$ / shares
TSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate grant date fair value of restricted stock units issued | $	$ 1.9
TSUs [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant Date Market Price	$ 4.48
TSUs [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant Date Market Price	8.70
PSUs [Member] | Minimum [Member] | Management Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Calculated fair value price	$ 1.64
PSUs [Member] | Maximum [Member] | Management Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate grant date fair value of restricted stock units issued | $	$ 0.1
Calculated fair value price	$ 6.76

Long-Term Incentive Plans - S_3

Long-Term Incentive Plans - Summary of Fair Value Assumptions (Detail) - PSUs [Member] - $ / shares	Jul. 01, 2019	Apr. 01, 2019	Jan. 01, 2019	Sep. 30, 2019
Share Price Target 12.50 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price targets				$ 12.50
Risk-free interest rate	1.73%	2.28%	2.44%
Expected volatility	57.00%	50.00%	54.00%
Calculated fair value per PSU	$ 2.63	$ 4.22	$ 6.76
Share Price Target 15.00 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price targets				15
Risk-free interest rate	1.73%	2.28%	2.44%
Expected volatility	57.00%	50.00%	54.00%
Calculated fair value per PSU	$ 2.05	$ 3.43	$ 5.86
Share Price Target 17.50 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price targets				$ 17.50
Risk-free interest rate	1.73%	2.28%	2.44%
Expected volatility	57.00%	50.00%	54.00%
Calculated fair value per PSU	$ 1.64	$ 2.80	$ 5.11

Long-Term Incentive Plans - S_4

Long-Term Incentive Plans - Summary of Information Regarding Board RSUs Granted (Detail) - $ / shares		1 Months Ended	2 Months Ended	6 Months Ended	9 Months Ended
		Aug. 05, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested, Number of Units		(38,181)	(602,053)	(412,938)
2017 Non-Employee Directors Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of Units, Beginning Balance				36,955	36,955
Granted, Number of Units	[1]				40,060
Forfeited, Number of Units					0
Vested, Number of Units					(46,396)
Outstanding, Number of Units, Ending Balance			30,619		30,619
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance	[2]			$ 11.36	$ 11.36
Granted, Weighted-Average Grant Date Fair Value per Unit	[2]				6.95
Forfeited, Weighted-Average Grant Date Fair Value per Unit	[2]				0
Vested, Weighted-Average Grant Date Fair Value per Unit	[2]				9.54
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance	[2]		$ 8.35		$ 8.35
[1]	The aggregate grant date fair value of Board RSUs issued for the nine months ended September 30, 2019 was $0.3 million based on grant date market price of $6.95 per share.
[2]	Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.

Long-Term Incentive Plans - S_5

Long-Term Incentive Plans - Summary of Information Regarding Board RSUs Granted (Parenthetical) (Detail) - 2017 Non-Employee Directors Compensation Plan [Member] - Restricted Stock Units (RSUs) [Member] $ / shares in Units, $ in Millions	Sep. 30, 2019USD ($)$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate grant date fair value of restricted stock units issued | $	$ 0.3
Grant Date Market Price | $ / shares	$ 6.95

Long-Term Incentive Plans - S_6

Long-Term Incentive Plans - Summary of Amount of Compensation Expense Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity based compensation expense (benefit)	$ 828	$ 1,068	$ 2,898	$ 1,561
TSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity based compensation expense (benefit)	650	490	1,852	601
PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity based compensation expense (benefit)	120	495	825	747
Board RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity based compensation expense (benefit)	58	44	221	98
Restricted Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity based compensation expense (benefit)	$ 0	$ 39	$ 0	$ 115

Long-Term Incentive Plans - S_7

Long-Term Incentive Plans - Summary of Non-vested Restricted Stock Unit Award Activity (Detail) - $ / shares	1 Months Ended	2 Months Ended	6 Months Ended
	Aug. 05, 2019	Sep. 30, 2019	Jun. 30, 2019
Units
Vested, Number of Units	(38,181)	(602,053)	(412,938)
Restricted Stock Units (RSUs) [Member] | Midstates 2016 Long Term Incentive Plan [Member]
Units
Outstanding, Number of Units, Beginning Balance		353,464
Granted, Number of Units		0
Forfeited, Number of units		0
Vested, Number of Units		(327,802)
Outstanding, Number of Units, Ending Balance	353,464	25,662
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance		$ 12.25
Granted, Weighted-Average Grant Date Fair Value per Unit		0
Forfeited, Weighted-Average Grant Date Fair Value per Unit		0
Vested, Weighted-Average Grant Date Fair Value per Unit		12.02
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance	$ 12.25	$ 15.23

Long-Term Incentive Plans - S_8

Long-Term Incentive Plans - Summary of Non-vested Stock Option Activity (Detail) - Stock Options [Member] - Midstates 2016 Long Term Incentive Plan [Member]	2 Months Ended
	Sep. 30, 2019$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of units, Beginning balance | shares	54,365
Granted, Number of units | shares	0
Forfeited, Number of units | shares	0
Vested, Number of units | shares	(50,870)
Outstanding, Number of units, Ending balance | shares	3,495
Outstanding, Weighted average grant date fair value per unit, Beginning balance | $ / shares	$ 19.68
Granted, Weighted average grant date fair value per unit | $ / shares	0
Forfeited, Weighted average grant date fair value per unit | $ / shares	0
Vested, Weighted average grant date fair value per unit | $ / shares	19.68
Outstanding, Weighted average grant date fair value per unit, Ending balance | $ / shares	$ 19.66

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Lessee Lease Description [Line Items]
Operating lease - long term right-of-use asset	$ 4,925		$ 4,925			$ 0
Operating Liabilities	$ 4,946		4,946
Lease, option to terminate	leases can be terminated with 30-day prior written notice
Lease termination period with prior written notice	30 days
Loss on lease	$ 4,237	$ 0	$ 4,237	$ 0
ASU 2016-02 [Member]
Lessee Lease Description [Line Items]
Operating lease - long term right-of-use asset					$ 5,400
Operating Liabilities					$ 5,400

Leases - Schedule of Right-of-U

Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease - long term right-of-use asset	$ 4,925	$ 0
Current lease liability	1,732	0
Operating lease liability	3,214	$ 0
Total lease liability	$ 4,946

Leases - Schedule of Maturity A

Leases - Schedule of Maturity Analysis of Minimum Lease Payment Obligation Under Non-cancellable Operating Leases (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Lessee Lease Description [Line Items]
Remaining 2019	$ 574
2020	1,768
2021	2,354
2022 and thereafter	530
Total lease payments	5,226
Less: interest	280
Present value of lease liabilities	4,946
Office Leases [Member]
Lessee Lease Description [Line Items]
Remaining 2019	399
2020	1,231
2021	1,727
2022 and thereafter	411
Total lease payments	3,768
Less: interest	220
Present value of lease liabilities	3,548
Leased Vehicles and Office Equipment [Member]
Lessee Lease Description [Line Items]
Remaining 2019	175
2020	537
2021	627
2022 and thereafter	119
Total lease payments	1,458
Less: interest	60
Present value of lease liabilities	$ 1,398

Leases - Schedule of Future Con

Leases - Schedule of Future Contractual Payment for Operating Leases (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
Future contractual payment for operating leases, Total	$ 11,846
Future contractual payment for operating leases, 2019	5,893
Future contractual payment for operating leases, 2020	2,072
Future contractual payment for operating leases, 2021	2,109
Future contractual payment for operating leases, 2022	337
Future contractual payment for operating leases, 2023	205
Future contractual payment for operating leases, After 2023	$ 1,230

Leases - Schedule of Weighted A

Leases - Schedule of Weighted Average Remaining Lease Terms and Discount Rate of Operating Leases (Detail)	Sep. 30, 2019
Office Leases [Member]
Lessee Lease Description [Line Items]
Weighted average remaining lease term	1 year 8 months 1 day
Weighted average discount rate	3.61%
Vehicles [Member]
Lessee Lease Description [Line Items]
Weighted average remaining lease term	6 months 10 days
Weighted average discount rate	0.85%
Office Equipment [Member]
Lessee Lease Description [Line Items]
Weighted average remaining lease term	1 month 2 days
Weighted average discount rate	0.18%

Supplemental Disclosures to t_3

Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows - Summary of Current Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accrued Liabilities Current [Abstract]
Accrued lease operating expense	$ 11,561	$ 10,469
Accrued capital expenditures	5,448	4,349
Accrued general and administrative expense	4,459	4,393
Accrued ad valorem tax	2,541	729
Operating lease liability	1,732	0
Asset retirement obligations	477	477
Accrued interest payable	38	2,476
Other	71	262
Accrued liabilities	$ 26,327	$ 23,155

Supplemental Disclosures to t_4

Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows - Summary of Cash and Cash Equivalents Reconciliation (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 7,408	$ 49,704
Restricted cash	325	325
Total cash, cash equivalents and restricted cash	$ 7,733	$ 50,029	$ 12,187	$ 6,392

Supplemental Disclosures to t_5

Supplemental Disclosures to the Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Cash Flows - Summary of Supplemental Cash Flows (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Supplemental cash flows:
Cash paid for interest, net of amounts capitalized	$ 12,477	$ 15,405
Cash paid for reorganization items, net	684	2,004
Noncash investing and financing activities:
Increase (decrease) in capital expenditures in payables and accrued liabilities	324	(565)
Assets acquired & liabilities assumed in the Merger:
Accounts receivable	14,633	0
Prepaids and other current assets	3,229	0
Other non-current assets	9,879	0
Oil and natural gas properties	142,642	0
Other property and equipment	6,280	0
Accounts payable and accrued liabilities	(24,135)	0
Other non-current liabilities	(5,067)	0
Long-term debt	(76,559)	0
Issuance of common stock in connection with the Merger	$ 90,150	$ 0

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Maximum [Member]
Related Party Transaction [Line Items]
Amount of related party transaction	$ 120,000	$ 120,000	$ 120,000	$ 120,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	Jun. 24, 2019	Sep. 30, 2019	Dec. 31, 2018
Commitments and Contingencies Additional Textual [Abstract]
Remaining environmental accrued liability recorded		$ 0	$ 0
Beta's decommissioning obligations, previously supported by surety bonds		71,300,000
Beta's decommissioning obligations, cash		90,200,000
Proceeds from Beta Decommissioning Trust account	$ 90,000,000	0
Beta's decommissioning obligations, full supported by surety bonds		161,300,000
Beta's decommissioning remaining obligations, cash		$ 300,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Line Items]
Income tax benefit (expense)	$ 0	$ 0	$ 50,000	$ 0
Effective tax rate	0.00%	0.00%	0.60%	0.00%
Maximum [Member]
Income Tax Disclosure [Line Items]
Income tax benefit (expense)			$ 100,000