Rosehill Resources 10-K 28 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 22, 2019	Jun. 30, 2018
Document And Entity Information
Entity Registrant Name	Rosehill Resources Inc.
Central Index Key	0001659122
Document Type	10-K
Trading Symbol	ROSE
Document Period-End Date	Dec. 31, 2018
Amendment Flag	false
Current Fiscal Year-End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2018
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Emerging Growth Company	true
Ex Transition Period	false
Small Business	true
Entity Shell Company	false
Entity Public Float			$ 27.2
Class A Common Stock
Entity Common Stock, Shares Outstanding		13,760,136
Class B Common Stock
Entity Common Stock, Shares Outstanding		29,807,692

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 20,157	$ 20,677
Restricted cash	0	4,005
Accounts receivable	32,260	1,527
Accounts receivable, related parties	78	16,022
Derivative assets	30,819	0
Prepaid and other current assets	1,371	1,312
Total current assets	84,685	43,543
Property and equipment:
Oil and natural gas properties (successful efforts), net	666,797	431,332
Other property and equipment, net	2,592	1,283
Total property and equipment, net	669,389	432,615
Other assets, net	4,678	824
Derivative assets	58,314	0
Total assets	817,066	476,982
Current liabilities:
Accounts payable	21,013	31,868
Accounts payable, related parties	287	223
Derivative liabilities	0	10,772
Accrued liabilities and other	27,335	15,492
Accrued capital expenditures	30,529	45,045
Total current liabilities	79,164	103,400
Long-term liabilities:
Long-term debt, net	288,298	93,199
Asset retirement obligations, net of current portion	13,524	8,522
Deferred tax liabilities	9,278	153
Derivative liabilities	696	8,008
Other liabilities	3,658	168
Total long-term liabilities	315,454	110,050
Total liabilities	394,618	213,450
Commitments and contingencies (Note 16)
Stockholders’ equity
Additional paid-in capital	42,271	29,946
Retained earnings	26,661	0
Total common stockholders’ equity	68,936	29,950
Noncontrolling interest	113,770	12,054
Total stockholders’ equity	267,337	122,664
Total liabilities, mezzanine and stockholders’ equity	817,066	476,982
Series B Preferred Stock
Mezzanine equity
Series B Preferred Stock; $0.0001 par value, 10.0% Redeemable, $1,000 per share liquidation preference; of the 1,000,000 shares of Preferred Stock authorized, 210,000 shares designated, 156,746 and 150,626 shares issued and outstanding as of December 31, 2018 and 2017, respectively	155,111	140,868
Series A Preferred Stock
Stockholders’ equity
Series A Preferred Stock; $0.0001 par value, 8.0% Cumulative Perpetual Convertible, $1,000 per share liquidation preference; of the 1,000,000 shares of Preferred Stock authorized, 150,000 shares designated, 101,669 and 97,698 shares issued and outstanding as of December 31, 2018 and 2017, respectively	84,631	80,660
Class A Common Stock
Stockholders’ equity
Common stock	1	1
Class B Common Stock
Stockholders’ equity
Common stock	$ 3	$ 3

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Series B Preferred Stock
Series B preferred stock, par value (USD per share)	$ 0.0001	$ 0.0001
Series B preferred stock, dividend rate (as a percent)	10.00%	10.00%
Series B preferred stock, liquidation preference (USD per share)	$ 1,000	$ 1,000
Series B preferred stock authorized (shares)	1,000,000	1,000,000
Series B preferred stock designated (shares)	210,000	210,000
Series B preferred stock issued (shares)	156,746	150,626
Series B preferred stock outstanding (shares)	156,746	150,626
Series A Preferred Stock
Series A preferred stock, par value (USD per share)	$ 0.0001	$ 0.0001
Series A preferred stock, dividend rate (as a percent)	8.00%	8.00%
Series A preferred stock, liquidation preference (USD per share)	$ 1,000	$ 1,000
Series A preferred stock authorized (shares)	1,000,000	1,000,000
Series A preferred stock designated (shares)	150,000	150,000
Series A preferred stock issued (shares)	101,669	97,698
Series A preferred stock outstanding (shares)	101,669	97,698
Class A Common Stock
Common stock, par value (USD per share)	$ 0.0001	$ 0.0001
Common stock authorized (shares)	250,000,000	95,000,000
Common stock issued (shares)	13,760,136	6,222,299
Common stock outstanding (shares)	13,760,136	6,222,299
Class B Common Stock
Common stock, par value (USD per share)	$ 0.0001	$ 0.0001
Common stock authorized (shares)	30,000,000	30,000,000
Common stock issued (shares)	29,807,692	29,807,692
Common stock outstanding (shares)	29,807,692	29,807,692

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Total revenues	$ 301,875,000	$ 76,236,000	$ 34,645,000
Operating expenses:
Lease operating expenses	39,010,000	10,881,000	4,800,000
Production taxes	14,506,000	3,535,000	1,541,000
Gathering and transportation	4,939,000	2,976,000	2,398,000
Depreciation, depletion, amortization and accretion	141,815,000	36,091,000	24,965,000
Impairment of oil and natural gas properties	0	1,061,000	0
Exploration costs	4,374,000	1,747,000	794,000
General and administrative	30,469,000	13,428,000	6,166,000
Transaction costs	0	2,618,000	2,834,000
(Gain) loss on disposition of property and equipment	499,000	(4,995,000)	(50,000)
Total operating expenses	235,612,000	67,342,000	43,448,000
Operating income	66,263,000	8,894,000	(8,803,000)
Other income (expense):
Interest expense, net	(19,489,000)	(2,532,000)	(1,822,000)
Gain (loss) on commodity derivative instruments, net	92,604,000	(16,336,000)	(4,169,000)
Other expense, net	(3,254,000)	(284,000)	(247,000)
Total other income (expense), net	69,861,000	(19,152,000)	(6,238,000)
Income (loss) before income taxes	136,124,000	(10,258,000)	(15,041,000)
Income tax expense	18,162,000	1,690,000	148,000
Net income (loss)	117,962,000	(11,948,000)	(15,189,000)
Net income (loss) attributable to noncontrolling interest	59,926,000	(18,811,000)	0
Net income attributable to Rosehill Resources Inc. before preferred stock dividends	58,036,000	6,863,000	(15,189,000)
Series A Preferred Stock dividends and deemed dividends	7,938,000	12,936,000	0
Series B Preferred Stock dividends, deemed dividends, and return	23,437,000	2,447,000	0
Net income (loss) attributable to Rosehill Resources Inc. common stockholders	26,661,000	(8,520,000)	(15,189,000)
Net Income (Loss) Available to Common Stockholders, Diluted	$ 82,031,000	$ (8,520,000)	$ (15,189,000)
Earnings (loss) per common share:
Basic (USD per share)	$ 3.25	$ (1.43)	$ (2.59)
Diluted (USD per share)	$ 1.76	$ (1.43)	$ (2.59)
Weighted average common shares outstanding:
Basic (shares)	8,196	5,945	5,857
Diluted (shares)	46,499	5,945	5,857
Oil sales
Revenues:
Total revenues	$ 271,539,000	$ 61,596,000	$ 24,807,000
Natural gas sales
Revenues:
Total revenues	9,392,000	7,171,000	5,304,000
Natural gas liquids sales
Revenues:
Total revenues	$ 20,944,000	$ 7,469,000	$ 4,534,000

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Total Common Stockholders’ Equity	Preferred Stock Series A	Common Stock	Additional Paid-in Capital	Retained Earnings (Deficit)	Non-controlling Interest	Parent Net Investment	Class A Common StockCommon Stock	Class B Common StockCommon Stock
Balance at beginning of period (shares) at Dec. 31, 2015			0						0	0
Balance at beginning of period at Dec. 31, 2015	$ 78,977	$ 0	$ 0		$ 0	$ 0	$ 0	$ 78,977	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(15,189)							(15,189)
Net distribution to parent	1,432							1,432
Balance at end of period (shares) at Dec. 31, 2016			0						0	0
Balance at end of period at Dec. 31, 2016	65,220	0	$ 0		0	0	0	65,220	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(11,948)	2,449				2,449	(18,811)	4,414
Net distribution to parent	(2,267)							(2,267)
Benefit from reversal of valuation allowance	1,537	1,537			1,537
Issuance of stock and warrants (shares)			95,000	4,900,776					588,276
Issuance of stock and warrants	90,780	20,186	$ 70,594		20,186
Proceeds and shares obtained in the Transaction (shares)									5,856,581	29,807,692
Proceeds and shares obtained in the Transaction	18,688	7,451			7,447		78,604	(67,367)	$ 1	$ 3
Distribution to noncontrolling interest, net	(38,106)						(38,106)
Restricted shares granted to directors and employee service awards (shares)									119,456
Restricted shares granted to directors and employee service awards	0
Stock-based compensation	1,245	1,245			1,245
Series A Preferred stock dividends (shares)			5,530
Series A Preferred stock dividends	(38)	(12,936)	$ 12,898		(10,487)	(2,449)
Series A Preferred stock conversions (shares)			(2,832)						246,262
Series A Preferred stock conversions	0	2,832	$ (2,832)		2,832
Series B Preferred Stock dividends, deemed dividends and return	(2,447)	(2,447)			(2,447)
Impact of transactions affecting noncontrolling interest	0	9,633			9,633		(9,633)
Balance at end of period (shares) at Dec. 31, 2017			97,698						6,222,299	29,807,692
Balance at end of period at Dec. 31, 2017	122,664	29,950	$ 80,660		29,946	0	12,054	$ 0	$ 1	$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	117,962	58,036				58,036	59,926
Adjustment to deferred taxes	6,119	6,119			6,119
Benefit from reversal of valuation allowance	2,912	2,912			2,912
Issuance of stock and warrants (shares)									6,990,744
Issuance of stock and warrants	39,356	39,356			39,356
Restricted stock issued (shares)									640,814
Restricted stock issued	0
Restricted stock withheld for taxes (shares)									(93,721)
Restricted stock withheld for taxes	(749)	(749)			(749)
Stock-based compensation	6,477	6,477			6,477
Series A Preferred stock dividends (shares)			3,971
Series A Preferred stock dividends	(3,967)	(7,938)	$ 3,971		0	(7,938)
Series B Preferred Stock dividends, deemed dividends and return	(23,437)	(23,437)			0	(23,437)
Impact of transactions affecting noncontrolling interest	0	(41,790)			(41,790)		41,790
Balance at end of period (shares) at Dec. 31, 2018			101,669						13,760,136	29,807,692
Balance at end of period at Dec. 31, 2018	$ 267,337	$ 68,936	$ 84,631		$ 42,271	$ 26,661	$ 113,770		$ 1	$ 3

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 117,962	$ (11,948)	$ (15,189)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, amortization, accretion and impairment of oil and gas properties	141,815	37,152	24,965
Deferred income taxes	18,157	1,690	0
Stock-based compensation	6,522	1,245	0
(Gain) loss on sale of fixed assets	499	(4,995)	(50)
(Gain) loss on derivative instruments	(92,534)	16,706	4,630
Net cash received (paid) in settlement of derivative instruments	(14,683)	74	(1,608)
Amortization of debt issuance costs	2,139	274	113
Settlement of asset retirement obligations	(801)	(840)	(53)
Tax Receivable Agreement Expense	3,518	0	0
Changes in operating assets and liabilities:
(Increase) in accounts receivable and accounts receivable, related parties	(14,816)	(8,230)	(3,091)
(Increase) decrease in prepaid and other assets	(59)	(451)	53
Increase in accounts payable and accrued liabilities and other	8,526	7,476	1,691
Increase (decrease) in accounts payable, related parties	64	(394)	0
Net cash provided by operating activities	176,309	37,759	11,461
Cash flows from investing activities:
Additions to oil and natural gas properties	(377,897)	(149,832)	(22,004)
Acquisition of White Wolf	(4,005)	(114,843)	0
Acquisition of land and leasehold, royalty and mineral interest	(15,281)	(6,500)	0
Additions to other property and equipment	(2,160)	(574)	(263)
Proceeds from sale of other property and equipment	0	6,252	103
Net cash used in investing activities	(399,343)	(265,497)	(22,164)
Cash flows from financing activities:
Proceeds from revolving credit facility	274,000	66,000	10,000
Repayment on revolving credit facility	(80,000)	(121,000)	0
Repayment of long-term debt	0	0	(20,000)
Proceeds from Class A Common Stock offering	40,511	0	0
Class A Common Stock offering issuance costs	(1,155)
Proceeds from issuance of Series A Preferred Stock and Warrants	0	95,000	0
Series A Preferred Stock issuance costs	0	(4,220)	0
Proceeds from issuance of Series B Preferred Stock	0	150,000	0
Series B Preferred Stock upfront fees and transaction costs	(20)	(10,017)	0
Proceeds from Second lien notes, net	0	97,000	0
Net proceeds from the Transaction	0	18,688	0
Distribution to noncontrolling interest	0	(40,487)	0
Distribution to Tema	0	(2,267)	1,432
Debt issuance costs	(3,330)	(4,640)	0
Dividends paid on preferred stock	(10,716)	(38)	0
Restricted stock used for tax withholdings	(749)	0	0
Payment on capital lease obligation	(32)	(33)	(29)
Net cash provided by (used in) financing activities	218,509	243,986	(8,597)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(4,525)	16,248	(19,300)
Cash, cash equivalents, and restricted cash beginning of period	24,682	8,434	27,734
Cash, cash equivalents, and restricted cash end of period	20,157	24,682	8,434
Supplemental disclosures:
Cash paid for interest	17,065	1,889	1,794
Supplemental noncash activity:
Asset retirement obligations incurred	4,697	5,766	1,641
Changes in accrued capital expenditures	14,516	42,602	(1,434)
Changes in accounts payable for capital expenditures	7,456	25,541	0
Reconciliation of Cash, Cash Equivalents and Restricted Cash
Total cash, cash equivalents and restricted cash	24,682	8,434	27,734
Series A Preferred Stock
Supplemental noncash activity:
Series A Preferred Stock paid-in-kind	3,971	5,530	0
Series B Preferred Stock
Supplemental noncash activity:
Series B Preferred Stock dividends paid-in-kind	6,120	626	0
Series B Preferred Stock deemed dividend	$ 1,345	$ 174	$ 0

Organization and Basis of Prese

Organization and Basis of Presentation	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization Rosehill Resources Inc. (the “Company” or “Rosehill”) is an independent oil and natural gas company focused on the acquisition, exploration, development and production of unconventional oil and associated liquids-rich natural gas reserves in the Permian Basin. The Company’s assets are concentrated in the Delaware Basin, a sub-basin of the Permian Basin. The Company was incorporated in Delaware on September 21, 2015 as a special purpose acquisition company under the name of KLR Energy Acquisition Corp. (“KLRE”) for the purpose of effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination involving the Company and one or more businesses. On April 27, 2017, the Company acquired a portion of the equity of Rosehill Operating Company, LLC (“Rosehill Operating”), in a transaction structured as a reverse recapitalization (the “Transaction”), into which Tema Oil & Gas Company (“Tema”), a wholly owned subsidiary of Rosemore, Inc. (“Rosemore”), contributed certain assets and liabilities. At the closing of the Transaction, the Company became the sole managing member of Rosehill Operating. Following the Transaction, the Company changed its name to Rosehill Resources Inc. As the sole managing member of Rosehill Operating, the Company, through its officers and directors, is responsible for all operational and administrative decision-making and control of all of the day-to-day business affairs of Rosehill Operating without the approval of any other member, unless specified in the Second Amended and Restated Limited Liability Company Agreement of Rosehill Operating (the “LLC Agreement”). Transaction On April 27, 2017, upon closing the Transaction, the Company acquired a portion of the common units of Rosehill Operating (the “Rosehill Operating Common Units”) for (i) the contribution to Rosehill Operating by the Company of $35 million in cash (the “Cash Consideration”), excluding the working capital adjustment, and the issuance to Rosehill Operating by the Company of 29,807,692 shares of its Class B Common Stock, (ii) the assumption by Rosehill Operating of $55 million in Tema indebtedness and (iii) the contribution to Rosehill Operating by the Company of the remaining cash proceeds of the Company’s initial public offering net of redemptions of approximately $60.6 million . In connection with the closing of the Transaction, the Company issued to Rosehill Operating 4,000,000 warrants exercisable for shares of the Company’s Class A Common Stock (the “Tema warrants”) in exchange for 4,000,000 warrants exercisable for Rosehill Operating Common Units (the “Rosehill warrants”). The Cash Consideration, estimated working capital adjustment, Tema warrants and shares of Class B Common Stock were immediately distributed to Tema. The working capital adjustment was originally estimated to be $5.6 million and was contributed to Rosehill Operating by the Company upon closing the Transaction. The final working capital adjustment of $2.4 million due to the Company from Tema was reflected as a reduction to the preliminary purchase price. In connection with the Transaction, the Company issued and sold 75,000 shares of its 8% Series A Cumulative Perpetual Convertible Preferred Stock (the “Series A Preferred Stock”) and 5,000,000 warrants in a private placement to certain qualified institutional buyers and accredited investors (the “PIPE Investors”) for net proceeds of $70.8 million (the “PIPE Investment”). The Company issued an additional 20,000 shares of Series A Preferred Stock to Rosemore Holdings, Inc. (wholly owned subsidiary of Rosemore) and KLR Energy Sponsor, LLC (the “Sponsor”) in connection with the closing of the Transaction for net proceeds of $20 million . The Company contributed the net proceeds from the PIPE Investment and from the issuance of 20,000 shares of Series A Preferred Stock to Rosemore Holdings, Inc. and the Sponsor to Rosehill Operating in exchange for Rosehill Operating Series A Preferred Units and additional Rosehill warrants. Of these proceeds, $55 million was used to retire the indebtedness assumed by Rosehill Operating. Net cash provided by the Company upon the closing of the Transaction was $109.5 million , which consisted of $90.8 million of net proceeds from the sale of Series A Preferred Stock and $18.7 million from the sale of common shares prior to the Transaction, net of redemptions and offering and transaction costs. Basis of Presentation The consolidated financial results of the Company consist of the financial results of Rosehill and Rosehill Operating, its consolidated subsidiary. Pursuant to the Transaction described above, the Company acquired approximately 16.4% of the Rosehill Operating Common Units, while Tema retained approximately 83.6% of the Rosehill Operating Common Units. As of December 31, 2018 , the Company owns approximately 31.6% of the Rosehill Operating Common Units and Tema owns approximately 68.4% of the Rosehill Operating Common Units. The Transaction was accounted for as a reverse recapitalization. As a result, the reports filed by the Company subsequent to the Transaction are prepared “as if” Rosehill Operating is the predecessor and legal successor to the Company. The historical operations of Rosehill Operating are deemed to be those of the Company. Thus, the financial statements included in this report reflect (i) the historical operating results of Rosehill Operating prior to the Transaction; (ii) the combined results of the Company and Rosehill Operating following the Transaction; (iii) the assets and liabilities of Rosehill Operating at their historical cost; and (iv) the Company’s equity and earnings per share for all periods presented. All periods prior to the date of the Transaction shown in the accompanying consolidated financial statements have been prepared on a “carve-out” basis and are derived from the accounting records of Tema. The accompanying consolidated financial statements prior to the Transaction include direct expenses related to Rosehill Operating and expense allocations for certain functions of Tema including, but not limited to, general corporate expenses related to finance, legal, information technology, human resources, communications, insurance, utilities and compensation. These expenses have been allocated on the basis of direct usage when identifiable, actual volumes and revenues, with the remainder allocated proportionately on a barrel of oil equivalent (“Boe”) basis. Management considers the basis on which the expenses have been allocated to reasonably reflect the utilization of services provided to or the benefit received by Rosehill Operating during the periods presented. The allocations may not, however, reflect the expenses that would have been incurred as an independent company for the periods presented. Actual costs that may have been incurred prior to the Transaction would depend on a number of factors, including the organizational structure, whether functions were outsourced or performed by employees and strategic decisions made in areas such as information technology and infrastructure. The allocations and related estimates and assumptions are described more fully in Note 15 - Transactions with Related Parties. The consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”). All intercompany balances and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current presentation on the accompanying consolidated financial statements. Such reclassifications had no impact on net income, cash flows or shareholders’ equity previously reported. Variable Interest Entities Rosehill Operating is a variable interest entity. The Company determined that it is the primary beneficiary of Rosehill Operating as the Company is the sole managing member and has the power to direct the activities most significant to Rosehill Operating’s economic performance as well as the obligation to absorb losses and receive benefits that are potentially significant. The Company consolidated 100% of Rosehill Operating’s assets and liabilities and results of operations in the Company’s consolidated financial statements. Although Tema had a larger ownership interest in Rosehill Operating, because it has disproportionately fewer voting rights, Tema is shown as a noncontrolling interest holder of Rosehill Operating. For further discussion, see Noncontrolling Interest in Note 13 - Stockholders’ Equity .

Summary of Significant Accounti

Summary of Significant Accounting Policies and Recently Issued Accounting Standards	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Recently Issued Accounting Standards	Summary of Significant Accounting Policies and Recently Issued Accounting Standards Use of Estimates The preparation of the Company’s consolidated financial statements requires the Company’s management to make various assumptions, judgments and estimates to determine the reported amounts of assets, liabilities, revenues, expenses and in the disclosures of commitments and contingencies. Changes in these assumptions, judgments, and estimates will occur as a result of the passage of time and the occurrence of future events and, accordingly, actual results could differ from amounts previously reported. The more significant areas requiring the use of assumptions, judgments and estimates include: • the quantities and values of proved oil, natural gas and natural gas liquids (“NGLs”) reserves used in calculating depletion and assessing impairment of oil and natural gas properties and related present value estimates of future net cash flows therefrom, • the carrying value of oil and natural gas properties, • impairment of oil and natural gas properties, • asset retirement obligations, • oil and natural gas reserve quantities, • the fair value of commodity derivative instruments and positions, • fair value of the Company’s warrants, • estimates of the fair value of equity-based compensation, • estimates of current and deferred income taxes and • deferred income tax valuation allowances and amounts associated with the Company’s Tax Receivable Agreement with Tema (the “Tax Receivable Agreement”) (see Note 12 – Income Taxes) . While management believes these estimates are reasonable, changes in facts and assumptions, or the discovery of new information may result in revised estimates. Actual results could differ from these estimates and it is reasonably possible these estimates could be revised in the near term, and these revisions could be material. Cash and Cash Equivalents The Company considers all cash on hand, and highly liquid instruments with an original maturity of three months or less to be cash and cash equivalents. The Company’s cash and cash equivalents are held in financial institutions in amounts that may exceed the insurance limits of the Federal Deposit Insurance Corporation, however, management believes the Company’s counter-party risks are minimal based on the reputation and history of the institutions selected. Accounts Receivable Accounts receivable consist of receivables from joint interest owners on properties the Company operates and from sales of oil and natural gas production delivered to purchasers. The purchasers remit payment for production directly to the Company. Most payments are received within three months after the production date. Accounts receivable are not collateralized. Amounts due from joint interest owners or purchasers are stated net of an allowance for doubtful accounts when the Company believes collection is doubtful. For receivables from joint interest owners, the Company typically has the ability to withhold future revenue disbursements to recover any non-payment of joint interest billings. Accounts receivable outstanding longer than the contractual payment terms are considered past due. The Company determines its allowance by considering a number of factors, including the length of time accounts receivable are past due, the Company’s previous loss history, the debtor’s current ability to pay its obligation to the Company, the condition of the general economy and the industry as a whole. The Company writes off specific accounts receivable when they become uncollectible, and payments subsequently received on such receivables are credited to the allowance for doubtful accounts. No allowance was deemed necessary at December 31, 2018 or December 31, 2017. See details of the Company’s accounts receivable balance in Note 4 - Accounts Receivable . Revenue Recognition The Company derives its revenue primarily from the sale of produced oil, natural gas, and NGLs. Revenue is recognized when the Company’s production is delivered to the purchaser, but payment is generally received between 30 and 90 days after the date of production. No revenue is recognized unless it is determined that title to the product has transferred to a purchaser. At the end of each month, the Company make estimates of the amount of production delivered to the purchaser and the price it will receive. The Company uses its knowledge of its properties, contractual arrangements, NYMEX and local spot market prices, and other factors as the basis for these estimates. Variances between the estimates and the actual amounts received are recorded in the month payment is received. Transportation expenses for oil are included as a reduction to oil revenues, while gathering and transportation expenses for natural gas and NGLs are recorded within gathering and transportation. See Recently Issued Accounting Standards Not Yet Adopted within Note 2 for an update on the impact of ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASC 606”) , on how the Company will recognize revenue in 2019 and beyond. The table below presents percentages by purchaser that accounted for 10% or more of our total oil, natural gas and NGL sales for each year as presented: Year Ended December 31, 2018 2017 2016 Customer Gateway (1) 60 % 80 % 70 % Plains 17 — — Targa 13 — — ETC Field Services, LLC — 10 17 Enlink Midstream Services, LLC — — 10 Other 10 10 3 Total 100 % 100 % 100 % (1) For a further discussion see Note 15 - Related Party Transactions Successful Efforts Method of Accounting for Oil and Natural Gas Activities Oil and natural gas exploration, development and production activities are accounted for under the successful efforts method of accounting. Under this method, the costs incurred to acquire, drill and complete productive wells and development wells are capitalized. Oil and gas lease acquisition costs are also capitalized. Proved Oil and Natural Gas Properties . If proved reserves are found for these properties, costs incurred to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing oil, natural gas and NGLs are capitalized. All costs incurred to drill and equip successful exploratory wells, development wells, development-type stratigraphic test wells and service wells, including unsuccessful development wells, are capitalized. Capitalized costs attributed to the properties and mineral interests are subject to depreciation, depletion and amortization (“DD&A”). Depletion of capitalized costs is provided using the units-of-production method based on proved oil and gas reserves related to the associated reservoir. If no proved reserves have been found, the costs of each of the related exploratory wells are charged to expense. Unproved Properties . Acquisition costs associated with the acquisition of non-producing leaseholds are recorded as unproved leasehold costs and capitalized as incurred. These consist of costs incurred in obtaining a mineral interest or right in a property, such as a lease in addition to options to lease, broker fees, recording fees and other similar costs related to acquiring properties. Leasehold costs are classified as unproved until proved reserves are discovered, at which time related costs are transferred to proved oil and natural gas properties. Exploration Costs . Exploration costs, other than exploration drilling costs, are charged to expense as incurred. These costs include personnel and other internal costs, geological and geophysical expenses, exploratory dry holes, delay rentals for leases and cost associated with unsuccessful lease acquisitions. The costs of drilling exploratory wells and exploratory-type stratigraphic wells are initially capitalized pending determination of whether the well has discovered proved commercial reserves. If the exploratory well is determined to be unsuccessful, the cost of the well is transferred to expense. In some cases, a determination of proved reserves cannot be made at the completion of drilling, requiring additional testing and evaluation of the wells. The costs of such exploratory wells are expensed if a determination of proved reserves has not been made within a 12-month period after drilling is complete. For sales of a complete or partial unit of proved and unproved properties and related facilities, the cost and related accumulated DD&A are removed from the property accounts and gain or loss is recognized for the difference between the proceeds received and the net carrying value of the properties sold. Impairment of Oil and Natural Gas Properties The Company’s proved oil and natural gas properties are recorded at cost. The Company’s proved properties are evaluated for impairment on a field-by-field basis whenever events or changes in circumstances indicate that an asset’s carrying value may not be recoverable. The Company compares expected undiscounted future cash flows to the net book value of the asset. If the future undiscounted expected cash flows, based on its estimate of future oil and natural gas prices, operating costs and anticipated production from proved reserves and risk-adjusted probable and possible reserves, are lower than the net book value of the asset, the capitalized cost is reduced to fair value. Commodity pricing is estimated by using WTI and Henry Hub natural gas NYMEX strip market pricing, adjusted for quality, transportation fees and a regional price differential. Fair value is calculated by discounting the future cash flows at a rate of 10% . The Company believes a 10% discount rate is commonly used by oil and gas industry peers, analysts and investors in evaluating the monetary significance of oil and gas properties and for comparing the size and value of proved reserves among companies in our industry. Accordingly, the Company currently believes a 10% discount rate is consistent with a rate a market participant would consider in evaluating onshore domestic proved oil and gas reserves and produces a reasonable estimate of fair value. Unproved oil and natural gas properties are assessed periodically, and no less than annually, for impairment on an aggregate basis based on remaining lease term, drilling results, reservoir performance, seismic interpretation and future plans to develop acreage. As unproved oil and natural gas properties are developed and reserves are proved, the capitalized costs are subject to depreciation and depletion. If the development of these properties is deemed unsuccessful, the capitalized costs related to the unsuccessful activity is expensed in the year the determination is made. The rate at which the unproved oil and natural gas properties are written off or reclassified to proved oil and natural gas properties depends on the timing and success of the Company’s future exploration and development program. Oil and Natural Gas Reserve Quantities The Company’s estimated proved reserve quantities and future net cash flows are critical to the understanding of the value of its business. They are used in comparative financial ratios and are the basis for significant accounting estimates in its financial statements, including the calculations of depletion and impairment of proved oil and natural gas properties. Future cash inflows and future production and development costs are determined by applying prices and costs, including transportation, quality differentials and basis differentials, applicable to each period to the estimated quantities of proved reserves remaining to be produced as of the end of that period. Expected cash flows are discounted to present value using an appropriate discount rate. For example, the standardized measure calculations require a 10% discount rate to be applied. Although reserve estimates are inherently imprecise, and estimates of new discoveries and undeveloped locations are more imprecise than those of established producing oil and gas properties, the Company makes a considerable effort in estimating our reserves. The Company expects proved reserve estimates will change as additional information becomes available and as commodity prices and operating and capital costs change. The Company has and expects to evaluate and estimate its proved reserves each year-end. For purposes of depletion and impairment, reserve quantities are adjusted in accordance with U.S. GAAP for the impact of additions and dispositions. Other Property and Equipment Other property and equipment such as office furniture and equipment, buildings, computer hardware and software is recorded at cost. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets ranging from three to twenty years. Major renewals and improvements are capitalized while expenditures for maintenance and repairs are expensed as incurred. When other property and equipment is sold or retired, the capitalized costs and related accumulated depreciation are removed from the accounts. Asset Retirement Obligations An asset retirement obligation (“ARO”) represents the estimated present value of the amount a company will incur to retire a long-lived asset at the end of its productive life, in accordance with applicable state laws. The Company recognizes an estimated liability for future costs primarily associated with the abandonment of its oil and natural gas properties and related assets. The amount of the ARO is determined by calculating the present value of estimated cash flows related to the liability. The retirement obligation is recorded as a liability at its estimated present value at inception (i.e. at the time the well is drilled or acquired and related assets are placed into service) with an offsetting increase in the carrying amount of the related long-lived asset that is included in proved oil and natural gas properties in the accompanying consolidated balance sheets. Periodic accretion of discount of the estimated liability is recorded as an expense in the consolidated statement of operations. The Company depreciates the long-lived asset, including the asset retirement cost, over its useful life, and recognizes expense in connection with the accretion of the discounted liability over the remaining estimated economic lives of the respective oil and natural gas properties. An asset retirement liability is determined using significant assumptions, including current estimates of plugging and abandonment costs, annual inflation of these costs, the productive lives of assets and the Company’s risk-adjusted interest rate. Changes in any of these assumptions can result in significant revisions to the estimated asset retirement obligation. Because of the subjectivity of assumptions, the costs to ultimately retire the Company’s wells may vary significantly from prior estimates. See Note 8 - Asset Retirement Obligations for a further discussion. Deferred Financing Costs Deferred financing costs and discounts related to the Company’s Revolving Credit Facility and its Second Lien Notes are included in other long-term assets and long-term debt, respectively, in the consolidated balance sheets and are stated at cost, net of amortization. The deferred financing costs associated with the Revolving Credit Facility and the Second Lien Notes are amortized to interest expense on a straight-line basis and an effective rate of interest method, respectively, over the borrowing terms. See Note 10 - Long term debt, net for a further discussion. Commodity Derivative Instruments The Company utilizes commodity derivative instruments including swaps, collars, basis swaps and other similar agreements to manage its exposure to oil, natural gas and NGL price volatility (i.e., price risk) associated with the forecasted sale of a portion its oil and natural gas production. These commodity derivative instruments are not designated as hedges for accounting purposes. Accordingly, the Company records derivative instruments on the consolidated balance sheets as either an asset or liability measured at fair value and records changes in the fair value of derivatives in current earnings in the consolidated statements of operations as they occur in the period of change. Gains and losses on commodity derivatives and premiums paid for put options are included in cash flows from operating activities. To the extent legal right of offset exists with a counterparty, the Company reports derivative assets and liabilities on a net basis. The Company has exposure to credit risk to the extent the counterparty is unable to satisfy its settlement obligation. The Company actively monitors the creditworthiness of counterparties and assesses the impact, if any, on its derivative position. See Note 5 - Derivative Instruments for a further discussion. Fair Value of Financial Instruments Fair value represents the price that would be received to sell the asset or paid to transfer the liability in an orderly transaction between market participants at the reporting date. The Company’s assets and liabilities that are measured at fair value at each reporting date are classified according to a hierarchy that prioritizes inputs and assumptions underlying the valuation techniques. This fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs and consists of three broad levels: Level 1 : Observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets as of the reporting date. Level 2 : Observable market-based inputs or unobservable inputs that are corroborated by market data. These are inputs other than quoted prices in active markets included in Level 1 that are either directly or indirectly observable as of the reporting date. Level 3 : Unobservable inputs that are not corroborated by market data and may be used with internally developed methodologies that result in management’s best estimate of fair value. Valuation techniques that maximize the use of observable inputs are favored. Assets and liabilities are classified in their entirety based on the lowest priority level of input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the placement of assets and liabilities within the levels of the fair value hierarchy. Reclassifications of fair value between Level 1, Level 2 and Level 3 of the fair value hierarchy, if applicable, are made at the end of each quarter. See Note 6 – Fair Value Measurements for more fair value disclosures. Income Taxes The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are calculated by applying existing tax laws and the rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in the year of the enacted rate change. The Company accounts for uncertainty in income taxes using a recognition and measurement threshold for tax positions taken or expected to be taken in a tax return, which are subject to examination by federal and state taxing authorities. The tax benefit from an uncertain tax position is recognized when it is more likely than not that the position will be sustained upon examination by taxing authorities based on technical merits of the position. The amount of the tax benefit recognized is the largest amount of the benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. The effective tax rate and the tax basis of assets and liabilities reflect management’s estimates of the ultimate outcome of various tax uncertainties. The Company recognizes penalties and interest related to uncertain tax positions within the provision (benefit) for income taxes line in the accompanying consolidated statements of operations. Rosehill Operating, the Company’s accounting predecessor, is a limited liability company treated as a partnership for U.S. federal income tax purposes that is not subject to U.S. federal income tax. Earnings (Loss) Per Share The two-class method of computing earnings per share is required for entities that have participating securities. The two-class method is an earnings allocation formula that determines earnings per share for participating securities according to dividends declared (or accumulated) and participation rights in undistributed earnings. Our Class B Common Stock has no economic interest in the earnings of the Company. Basic earnings (loss) per common share is calculated by dividing net income (loss) attributable to common shareholders by the weighted average number of shares of Class A Common Stock outstanding each period. Diluted earnings per share adds to those shares the incremental shares that would have been outstanding assuming exchanges of the Company’s outstanding Class B Common Stock, Series A Preferred Stock and warrants for Class A Common Stock, and the vesting of unvested restricted stock units of Class A Common Stock. An anti-dilutive impact is an increase in earnings per share or a reduction in net loss per share resulting from the conversion, exercise, or contingent issuance of certain securities. The Company uses the “if-converted” method to determine the potential dilutive effect of conversions of its outstanding Class B Common Stock and Series A Preferred Stock, and the treasury stock method to determine the potential dilutive effect of its outstanding warrants exercisable for shares of Class A Common Stock and the vesting of unvested restricted stock units of Class A Common Stock. See Note 3 - Earnings Per Share for the Company’s earnings (loss) per share calculation. Accounting Standards Adopted in 2018 Equity-based Compensation. In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-09 – Compensation – Stock Compensation (Topic 718); Scope of Modification Accounting. The new guidance clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award as equity or liability changes as a result of the change in terms or conditions. The Company adopted ASU 2017-09 in 2018. The adoption of ASU 2017-09 did not have a material impact on the Company’s consolidated financial statements for the year ended December 31, 2018. Recently Issued Accounting Standards Not Yet Adopted Revenue Recognition. ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASC 606”), supersedes the revenue recognition requirements in Topic 605, Revenue Recognition , and industry-specific guidance in Subtopic 932-605, Extractive Activities-Oil and Gas-Revenue Recognition and requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients , as clarifying guidance to improve the operability and understandability of the implementation guidance on principal versus agent considerations. ASC 606 became effective for the Company on January 1, 2019, and the Company has elected to adopt it using the modified retrospective method. The Company has substantially completed its review of the impact of ASC 606 on its significant contracts and determined that upon adoption of ASC 606, the Company will not be required to record a cumulative effect adjustment due to ASC 606 not having a quantitative impact compared to existing GAAP. While the Company does not expect 2019 net income (loss) or cash flows from operations to be impacted by the implementation of ASC 606, there will be certain changes to the presentation of revenues and related expenses beginning January 1, 2019. Prior to adoption, the Company recorded all gathering and processing fees incurred for natural gas and NGLs in “Gathering and transportation.” Upon adoption of ASC 606, where the Company delivers raw gas to midstream processing companies and retains control of its natural gas and plant products until tailgate of the plant, the cost of such gathering and processing will continue to be reflected in the Company’s “Gathering and transportation” as has been its practice historically. In the case where the Company delivers raw gas to the midstream processing companies and transfer control of its raw natural gas at the inlet to the midstream processing companies, such costs will be reported as a reduction to “Natural gas sales” and “Natural gas liquids sales.” Financial Assets and Financial Liabilities. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . The pronouncement requires, among other things, public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset. For the Company, these changes become effective for fiscal years beginning after December 15, 2018. In February 2018, the FASB issued ASU 2018-03, Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , which clarifies certain aspects of the guidance issued in ASU 2016-01 including: the ability to irrevocably elect to change the measurement approach for equity securities measured using the practical expedient (at cost plus or minus observable transactions less impairment) to a fair value method in accordance with Topic 820, Fair Value Measurement; clarification that if an observable transaction occurs for such securities, the adjustment is as of the observable transaction date; clarification that the prospective transition approach for equity securities without a readily determinable fair value is meant only for instances in which the practical expedient is elected; and various other clarifications. The expected adoption of ASU 2016-01 and ASU 2018-03 are being evaluated by the Company and the adoption is not expected to have a significant impact on the Company’s consolidated financial statements. Leases. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current U.S. GAAP. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842 , which provides clarifying guidance regarding land easements and adds practical expedients. In July 2018, further amendments were issued under ASU 2018-10, Codification Improvements to Topic 842, Leases . In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which provides entities with an additional transition method in which an entity initially applies the new leases standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2016-02 and its related updates are effective for the Company for fiscal years beginning after December 15, 2019. The Company is currently evaluating the method of adoption and the impact of the adoption of this guidance on its consolidated financial statements and disclosures. Financial Instruments – Credit Losses. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments requiring the measurement of all expected credit losses for financial assets, which include trade receivables, held at the reporting date based on historical experience, current conditions and reasonable and supportable forecasts. The guidance in this ASU is effective for the Company for fiscal years beginning after December 15, 2020, and interim periods within fiscal years beginning after December 15, 2021 with early adoption permitted for interim and annual periods beginning after December 15, 2018. The evaluation of this standard and its impact on the Company’s consolidated financial statements and related disclosures is currently being assessed. Derivatives and Hedging. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities , which expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. ASU 2017-12 is effective for the Company for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements. Fair Value Measurement Disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement , which removes, modifies and adds disclosure requirements on fair value measurements. ASU 2018-13 is effective for the Company for fiscal years beginning after December 15, 2019 and the Company is permitted to early adopt any removed or modified disclosures upon issuance of this ASU and delay adoption of the additional disclosures until their effective date. The Company is currently evaluating the impact of the adoption of this guidance on its disclosures.

Earnings (Loss) Per Share

Earnings (Loss) Per Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	Earnings (Loss) Per Share The Transaction was structured as a reverse recapitalization by which the Company issued stock for the net assets of Rosehill Operating accompanied by a recapitalization. Earnings per share has been recast for all historical periods to reflect the Company’s capital structure for all comparative periods. The following table sets forth the calculation of basic and diluted weighted average shares outstanding and earnings per share for the indicated periods: Year Ended December 31, 2018 2017 2016 (In thousands, except per share data) Net income (loss) (numerator): Net income (loss) attributable to common stockholders of Rosehill Resources Inc. - basic $ 26,661 $ (8,520 ) $ (15,189 ) Add: Dividends on Series A Preferred Stock 7,938 — — Add: Net income attributable to the noncontrolling interest, net of taxes 47,432 — — Net income (loss) attributable to common stockholders of Rosehill Resources Inc. - diluted $ 82,031 $ (8,520 ) $ (15,189 ) Weighted average shares (denominator): Weighted average shares – basic 8,196 5,945 5,857 Add: Dilutive effects of Series A Preferred Stock 8,495 — — Add: Dilutive effects of Class B Common Stock 29,808 — — Weighted average shares – diluted 46,499 5,945 5,857 Basic income (loss) per share $ 3.25 $ (1.43 ) $ (2.59 ) Diluted income (loss) per share $ 1.76 $ (1.43 ) $ (2.59 ) For the year ended December 31, 2018 , the Company excluded 25.6 million shares of Class A Common Stock issuable upon exercise of the Company’s warrant and 1.0 million shares of Class A Common Stock issuable upon vesting under the Company’s Long-Term Incentive Plan from the computation of diluted earnings per share because the effect of such events was anti-dilutive. For the year ended December 31, 2017, the Company excluded 29.8 million shares of Class A Common Stock issuable upon exchange of the Company’s Class B Common Stock, 25.6 million shares of Class A Common Stock issuable upon exercise of the Company’s warrants and 8.5 million shares of Class A Common Stock issuable upon conversion of the Company’s Series A Preferred Stock and 0.7 million shares of Class A Common Stock issuable upon vesting under the Company’s Long-Term Incentive Plan from the computation of diluted earnings per share because the effect of such events was anti-dilutive.

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Accounts Receivable	Accounts Receivable Accounts receivable is comprised of the following: December 31, 2018 December 31, 2017 Related Parties Third-Parties Related Parties Third-Parties (In thousands) Revenue receivable (1) $ — $ 28,876 $ 13,601 $ 1,153 Realized derivative receivable — 2,229 — — Transaction purchase price settlement — — 2,381 — Joint interest billings — 640 20 83 Other 78 515 20 291 Accounts receivable $ 78 $ 32,260 $ 16,022 $ 1,527 (1) All of the revenue receivable from related parties is attributable to Gateway Gathering and Marketing. For a further discussion see Note 15 - Related Party Transactions

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments Commodity derivatives. The Company enters into various derivative instruments primarily to mitigate a portion of the exposure to potentially adverse market changes in oil and natural gas commodity prices and the associated impact on cash flows. All contracts are entered into for other-than-trading purposes. Oil and natural gas commodity derivative instruments are recorded on the consolidated balance sheet at fair value as either an asset or a liability with changes in fair value recognized currently in earnings. While commodity derivative instruments are utilized to manage the price risk attributable to expected oil and natural gas production, the Company’s commodity derivative instruments are not designated as accounting hedges under the accounting guidance. The related cash flow impact of the commodity derivative activities is reflected as cash flows from operating activities unless they are determined to have a significant financing element at inception, in which case they are classified within financing activities. A description of the Company’s derivative financial instruments is provided below: Fixed price swaps - The Company receives a fixed price for the contract and pays a floating market price to the counterparty. Purchased put options - The Company purchases put options based on an index price from the counterparty by payment of a cash premium. If the index price is lower than the put’s strike price at the time of settlement, the Company receives from the counterparty such difference between the index price and the purchased put strike price. If the market price settles above the put’s strike price, no payment is due from either party. Two-way costless collars - Arrangements that contain a fixed floor price (purchased put option) and a fixed ceiling price (sold call option) based on an index price which, in aggregate, have no net cost. At the contract settlement date, (1) if the index price is higher than the ceiling price, the Company pays the counterparty the difference between the index price and ceiling price, (2) if the index price is between the floor and ceiling prices, no payments are due from either party and (3) if the index price is below the floor price, the Company will receive the difference between the floor price and the index price. Three-way costless collars - Arrangements that contain a purchased put option, a sold call option and a sold put option based on an index price which, in aggregate, have no net cost. At the contract settlement date, (1) if the index price is higher than the sold call strike price, the Company pays the counterparty the difference between the index price and sold call strike price, (2) if the index price is between the purchased put strike price and the sold call strike price, no payments are due from either party, (3) if the index price is between the sold put strike price and the purchased put strike price, the Company will receive the difference between the purchased put strike price and the index price and (4) if the index price is below the sold put strike price, the Company will receive the difference between the purchased put strike price and the sold put strike price Basis swaps - Arrangements that guarantee a price differential for natural gas from a specified delivery point. The Company receives a payment from the counterparty if the price differential is greater than the stated terms of the contract and pays the counterparty if the price differential is less than the stated terms of the contract. Interest rate swaps - Interest rate swaps are used to fix or float interest rates on existing or anticipated indebtedness. The purpose of these instruments is to manage the Company’s existing or anticipated exposure to unfavorable interest rate changes. Tema’s interest rate swap was terminated by Tema on April 20, 2017. At the closing of the Transaction, selected crude oil options and natural gas options were designated to remain with Tema. In connection with the Transaction, certain crude oil swaps and natural gas swaps were transferred to the Company. Contracts with one counterparty were novated to the Company in July 2017. Series B Preferred Stock bifurcated derivative - In the event of a change of control, the Company shall redeem in cash all of the outstanding shares of Series B Preferred Stock, excluding Series B PIK Shares, each as defined in Note 11 - 10% Series B Redeemable Preferred Stock , for a price per share equal to the Base Return Amount as defined in Note 11 - 10% Series B Redeemable Preferred Stock . The Company assessed the change of control feature and determined that the redemption of the outstanding shares of Series B Preferred Stock, excluding Series B PIK Shares, for a price per share equal to the Base Return Amount was a bifurcated derivative. See Note 11 - 10% Series B Redeemable Preferred Stock for defined terms and more detail. The following tables summarize the location and fair value amounts of all the Company’s derivative instruments in the consolidated balance sheets, as well as the gross recognized derivative assets, liabilities and amounts offset in the consolidated balance sheets: December 31, 2018 Gross Fair Value Gross Amounts Offset (1) Net Recognized Fair Value (In thousands) Assets Commodity derivatives - current $ 46,972 $ (16,153 ) $ 30,819 Commodity derivatives - non-current 88,008 (29,694 ) 58,314 Total assets $ 134,980 $ (45,847 ) $ 89,133 Liabilities Commodity derivatives - current $ (16,153 ) $ 16,153 $ — Commodity derivatives - non-current (29,694 ) 29,694 — Series B Preferred Stock bifurcated derivative - non-current (696 ) — (696 ) Total liabilities $ (46,543 ) $ 45,847 $ (696 ) (1) The Company has agreements in place with all of its counterparties that allow for the financial right of offset for derivative assets and liabilities. December 31, 2017 Gross Fair Value Gross Amounts Offset (1) Net Recognized Fair Value (In thousands) Assets Commodity derivatives - current $ 1,079 $ (1,079 ) $ — Commodity derivatives - non-current 120 (120 ) — Total assets $ 1,199 $ (1,199 ) $ — Liabilities Commodity derivatives - current $ (11,851 ) $ 1,079 $ (10,772 ) Commodity derivatives - non-current (7,503 ) 120 (7,383 ) Series B Preferred Stock bifurcated derivative - non-current (625 ) — (625 ) Total liabilities $ (19,979 ) $ 1,199 $ (18,780 ) (1) The Company has agreements in place with all of its counterparties that allow for the financial right of offset for derivative assets and liabilities. As of December 31, 2018 , the open commodity derivative positions with respect to future production were as follows: 2019 2020 2021 2022 Commodity derivative swaps Oil: Notional volume (Bbls) 2,664,000 1,960,000 2,160,000 1,100,000 Weighted average fixed price ($/Bbl) $ 53.59 $ 60.09 $ 61.21 $ 58.42 Natural gas: Notional volume (MMBtu) 2,220,000 1,500,000 1,200,000 1,200,000 Weighted average fixed price ($/MMbtu) $ 2.88 $ 2.84 $ 2.85 $ 2.87 Ethane: Notional volume (Gallons) 12,444,138 — — — Weighted average fixed price ($/Gallons) $ 0.28 $ — $ — $ — Propane: Notional volume (Gallons) 8,296,218 — — — Weighted average fixed price ($/Gallons) $ 0.79 $ — $ — $ — Pentanes: Notional volume (Gallons) 2,765,700 — — — Weighted average fixed price ($/Gallons) $ 1.47 $ — $ — $ — Commodity derivative two-way collars Oil: Notional volume (Bbls) 601,000 — — — Weighted average ceiling price ($/Bbl) $ 61.30 $ — $ — $ — Weighted average floor price ($/Bbl) $ 55.21 $ — $ — $ — Commodity derivative three-way collars Oil: Notional volume (Bbls) 1,531,832 3,294,000 — — Weighted average ceiling price ($/Bbl) $ 68.52 $ 70.29 $ — $ — Weighted average floor price ($/Bbl) $ 57.62 $ 57.50 $ — $ — Weighted average sold put option price ($/Bbl) $ 45.51 $ 47.50 $ — $ — Crude oil basis swaps Midland / Cushing: Notional volume (Bbls) 4,800,832 3,513,600 — — Weighted average fixed price ($/Bbl) $ (4.93 ) $ (1.43 ) $ — $ — Natural gas basis swaps EP Permian: Notional volume (MMBtu) 1,781,472 2,096,160 — — Weighted average fixed price ($/MMBtu) $ (1.03 ) $ (1.03 ) $ — $ — For the years ended December 31, 2018 and 2017 , the effect of the derivative activity on the Company’s Consolidated Statements of Operations was as follows: Year Ended December 31, 2018 2017 2016 (In thousands) Realized gain (loss) on derivatives Commodity derivative options $ (83 ) $ 172 $ 511 Commodity derivative swaps (15,399 ) 45 (1,334 ) Total (15,482 ) 217 (823 ) Interest rate swap — (143 ) (785 ) Total realized gain (loss) on derivatives $ (15,482 ) $ 74 $ (1,608 ) Unrealized gain (loss) on derivatives Commodity derivative options $ 28,965 $ 313 $ (1,508 ) Commodity derivative swaps 79,121 (16,866 ) (1,838 ) Total 108,086 (16,553 ) (3,346 ) Interest rate swap — (226 ) $ (3,346 ) Series B Preferred Stock bifurcated derivative (71 ) — 324 Total unrealized gain (loss) on derivatives $ 108,015 $ (16,779 ) $ (3,022 ) The gains and losses resulting from the cash settlement and mark-to-market of the commodity derivatives are included within “Gain (loss) on commodity derivative instruments, net” in the Consolidated Statements of Operations. The gains and losses resulting from the cash settlement and mark-to-market of the interest rate swap are included in “Interest expense, net” in the Consolidated Statements of Operations.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Financial Instruments The financial instruments measured at fair value on a recurring basis consist of the following: December 31, December 31, 2018 2017 (In thousands) Derivative assets (liabilities) Derivative assets - current $ 30,819 $ — Derivative assets - non-current 58,314 — Total derivative assets 89,133 — Derivative liabilities - current $ — $ (10,772 ) Derivative liabilities - non-current (696 ) (8,008 ) Total derivative, net $ 88,437 $ (18,780 ) Derivative assets and liabilities primarily represent unsettled amounts related to commodity derivative positions, including swaps and options. Derivative liabilities also include the Series B Preferred Stock bifurcated derivative for the various redemption amounts that the Company could incur if a change of control event occurs. The Company utilizes Level 3 assumptions to estimate the probability of a change of control occurring and when that would occur as the timing impacts the Base Return Amount as defined in Note 11 - 10% Series B Redeemable Preferred Stock . The change in fair value to the Series B Preferred Stock bifurcated derivative for the period is recorded in “Other income (expense), net” in the Consolidated Statements of Operations. The tables below set forth by level within the fair value hierarchy represent the net components of the assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2018 and December 31, 2017 . These net balances are intended solely to provide information on sources of inputs to fair value and proportions of fair value involving objective versus subjective valuations and do not represent either the actual credit exposure or net economic exposure. December 31, 2018 Level 1 Level 2 Level 3 Total (In thousands) Derivative assets Commodity derivative assets - current $ — $ 30,819 $ — $ 30,819 Commodity derivative assets - non-current — 58,314 — 58,314 Total derivative assets $ — $ 89,133 $ — $ 89,133 Derivative liabilities Series B Preferred Stock bifurcated derivative - non-current $ — $ — $ (696 ) $ (696 ) Total derivative liabilities $ — $ — $ (696 ) $ (696 ) December 31, 2017 Level 1 Level 2 Level 3 Total (In thousands) Derivative liabilities Commodity derivative liabilities - current $ — $ (10,772 ) $ — $ (10,772 ) Commodity derivative liabilities - non-current — (7,383 ) — (7,383 ) Series B Preferred Stock bifurcated derivative - non-current — — (625 ) (625 ) Total derivative liabilities $ — $ (18,155 ) $ (625 ) $ (18,780 ) The table below sets forth a summary of changes in the fair value of the Company’s level 3 liabilities for the year ended December 31, 2018 . Beginning Balance $ 625 (Gains) losses reported in earnings 71 Ending Balance $ 696 Financing Arrangements The carrying amounts of the Company’s cash, cash equivalents, accounts receivable, accounts payable and accrued liabilities approximate their fair values because of the short-term maturities and/or liquid nature of these assets and liabilities. The Company’s revolving credit facility carrying value is representative of its fair value because the interest rate changes monthly based on the current market of the stated rates in the agreement. As of December 31, 2018 , the fair value of the 10% Senior Secured Second Lien Notes (the “Second Lien Notes”) was $95.2 million , which was determined using quoted prices for similar instruments, a Level 2 classification in the fair value hierarchy. Because the Second Lien Notes were negotiated on an arm’s length basis with reputable third-party lenders at prevailing market rates in December 2017, the Company determined the carrying value to be representative of the fair value at December 31, 2017. Non-Financial Assets and Liabilities Non-financial assets and liabilities that are initially measured at fair value are comprised of asset retirement obligations and the corresponding increase to the related long-lived asset and are not remeasured at fair value in subsequent periods. Such initial measurements are classified as Level 3 because certain significant unobservable inputs are utilized in their determination. The fair value of additions to asset retirement obligation liability and certain changes in the estimated fair value of the liability are measured using valuation techniques consistent with the income approach, converting future cash flows to a single discounted amount. Significant inputs to the valuation include (i) estimated plug and abandonment cost per well based on historical experience and information from third-parties; (ii) estimated remaining life per well; (iii) future inflation factors; and (iv) average credit-adjusted risk-free rate. These inputs require significant judgments and estimates by management at the time of the valuation and are the most sensitive and subject to change. If the carrying amount of oil and natural gas properties exceeds the estimated undiscounted future cash flows, the carrying amount of the oil and natural gas properties will be adjusted to the fair value. The fair value of oil and natural gas properties is determined using valuation techniques consistent with the income and market approach. The factors used to determine fair value are subject to management’s judgment and expertise and include, but are not limited to, (i) recent sales prices of comparable properties; (ii) the present value of future cash flows, net of estimated operating and development costs using estimates of proved oil and natural gas reserves; (iii) future commodity prices; (iv) future production estimates; (v) anticipated capital expenditures; and (vi) various discount rates commensurate with the risk and current market conditions associated with the projected cash flows. These assumptions represent “Level 3” inputs.

Property and equipment

Property and equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property and equipment	Property and equipment Property and equipment is comprised of the following: December 31, December 31, 2018 2017 (In thousands) Proved oil and natural gas properties $ 777,558 $ 423,611 Unproved oil and natural gas properties 121,929 121,690 Land 1,575 406 Less: accumulated DD&A and impairment (234,265 ) (114,375 ) Total oil and natural gas properties (successful efforts), net 666,797 431,332 Other property and equipment 6,059 4,345 Less: accumulated DD&A (3,467 ) (3,062 ) Total other property and equipment 2,592 1,283 Total property and equipment, net $ 669,389 $ 432,615 As the Company’s exploration and development work progresses and the reserves on the Company’s properties are proven, capitalized costs attributed to the properties and mineral interests are subject to DD&A. Depletion of capitalized costs is provided using the units-of-production method based on proved oil and gas reserves related to the associated field. DD&A related to oil and natural gas properties was $140.4 million , $35.4 million and $24.4 million for the years ended December 31, 2018 , 2017 and 2016, respectively. Depreciation and amortization expense related to other property and equipment was $0.7 million , $0.4 million , and $0.4 million for the years ended December 31, 2018 , 2017 and 2016, respectively. Costs not subject to DD&A primarily include leasehold costs, broker and legal expenses and capitalized internal costs associated with developing oil and natural gas prospects on these properties. Leasehold costs are transferred into costs subject to depletion on an ongoing basis as these properties are evaluated and proved reserves are established. Additionally, costs associated with development wells in progress or awaiting completion at year-end are not subject to DD&A. These costs are transferred into costs subject to DD&A on an ongoing basis as these wells are completed and proved reserves are established or confirmed. Capitalized costs included in proved oil and natural gas properties not subject to DD&A totaled $87.1 million at December 31, 2018 and $57.2 million at December 31, 2017. There were no impairment charges related to proved or unproved oil and natural gas properties recorded for the years ended December 31, 2018 and 2016. Impairment charges related to proved and unproved oil and natural gas properties was $1.1 million for the year ended December 31, 2017. There were no exploratory well costs pending determination of proved reserves for the years ended December 31, 2018 and 2017. There were no unsuccessful exploratory dry hole costs during the years ended December 31, 2018 and 2016. Unsuccessful exploratory dry hole costs were $0.2 million for the year ended December 31, 2017. Acquisitions and Divestitures White Wolf Acquisition In December 2017, the Company acquired mineral rights and other associated assets and interests in the Southern Delaware Basin (the “White Wolf Acquisition”) for approximately $116.6 million , subject to customary purchase price adjustments, pursuant to a Purchase and Sale Agreement (the “PSA”) from certain sellers named therein (the “Sellers”). Subject to certain conditions under the PSA, until March 8, 2018, Rosehill Operating had the option to acquire additional oil and natural gas leases located within a certain designated area in the Delaware Basin (the “Designated Area”) from the Sellers. The option to purchase Additional Interest in the Designated Area expired on March 8, 2018 with the Company not acquiring any additional acreage. The Company incurred transaction fees of $2.9 million in connection with the White Wolf Acquisition, which were capitalized. In addition to acquiring mineral rights, some of the leases contained producing wells and their associated personal property such as tank batteries and pumping units, which were holding those particular leases. The Company acquired the asset retirement obligation for those producing wells and associated personal property which totaled $1.6 million as of December 31, 2017. Total consideration paid in connection with the White Wolf Acquisition was $121.1 million . The Company accounted for the White Wolf Acquisition as an asset acquisition. The total consideration was recorded to unproved oil and natural gas properties and the liability acquired was recorded to asset retirement obligation based on relative fair value. As of December 31, 2017, $4.0 million of the White Wolf Acquisition purchase price was in an escrow account. The PSA required that $4.0 million be placed in an escrow account to provide a non-exclusive source of funds to satisfy any liabilities incurred or sustained by the Company arising from any claims that the Sellers have indemnity obligations under the terms of the PSA. The funds were required to be escrowed until March 8, 2018, at which time any unused cash in the escrow account would be remitted to the Sellers. The Company did not use any of the escrowed funds and the full amount was released to the Seller in March 2018. Other Acquisitions In 2018, the Company paid approximately $15.3 million to acquire additional working interests, surface rights and additional royalty interests in our core areas throughout the Delaware Basin. In 2017, the Company purchased additional working interests in various operated wells and leasehold interests in Loving County, Texas for total consideration of $6.5 million . Barnett Shale Divestiture On November 2, 2017, the Company consummated the sale of Barnett Shale assets for a purchase price of approximately $7.1 million . After customary purchase price adjustments, the net purchase price was approximately $6.5 million , which resulted in gain on sale of $5.3 million . The divestiture of the Barnett Shale assets did not represent a strategic shift with a major effect on the Company’s operations and financial results, therefore, was not reported as a discontinued operation.

Asset Retirement Obligations

Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations The following table summarized the changes in the Company’s asset retirement obligation for the periods below: Year Ended December 31, 2018 2017 (In thousands) Asset retirement obligations, beginning of year $ 8,630 $ 5,431 Additional liabilities incurred 4,480 5,389 Dispositions — (2,380 ) Accretion expense 638 317 Liabilities settled upon plugging and abandoning wells (441 ) (504 ) Revision of estimates 217 377 Asset retirement obligations, end of year 13,524 8,630 Less: current portion of asset retirement obligations — 108 Long-term asset retirement obligations $ 13,524 $ 8,522

Accrued Liabilities and Other

Accrued Liabilities and Other	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued Liabilities and Other	Accrued Liabilities and Other Accrued liabilities and other is comprised of the following as of the respective dates: December 31, December 31, 2018 2017 (In thousands) Accrued payroll $ 3,764 $ 2,352 Royalties payable 11,511 3,903 Accrued lease operating expense 3,992 2,230 Contingent liability - White Wolf Acquisition — 4,005 Preferred Stock dividends payable 3,362 937 Accrued interest expense 925 639 Accrued production taxes 1,234 147 Accrued ad valorem taxes 1,066 — Accrued debt issuance costs 631 — Other 850 1,279 Total accrued liabilities and other $ 27,335 $ 15,492

Long-term debt, net

Long-term debt, net	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Long-term debt, net	Long-term debt, net The Company’s long-term debt is comprised of the following: December 31, December 31, 2018 2017 (In thousands) Second Lien Notes $ 100,000 $ 100,000 Revolving credit facility 194,000 — Total debt 294,000 100,000 Debt issuance cost on Second Lien Notes, net 3,211 3,830 Discount on Second Lien Notes, net 2,491 2,971 Total debt issuance cost and discounts 5,702 6,801 Total long-term debt, net $ 288,298 $ 93,199 Revolving Credit Facility On March 28, 2018, the Company entered into an Amended and Restated Credit Agreement (the “Amended and Restated Credit Agreement”) by and among the Company, as borrower, JPMorgan Chase Bank, N.A., as administrative agent, and certain other financial institutions party thereto, as lenders. The borrowings under the Amended and Restated Credit Agreement bear interest at an adjusted base rate plus an applicable margin ranging from 1% to 2% or at an adjusted LIBO Rate plus an applicable margin ranging from 2% to 3% . As of December 31, 2018 , the weighted average interest rate of outstanding borrowings under the Amended and Restated Credit Agreement was 5.308% . The Amended and Restated Credit Agreement amends and restates in its entirety the original credit agreement entered into on April 27, 2017 and amended on December 8, 2017. Pursuant to the Amended and Restated Credit Agreement, the lenders party thereto have agreed to provide the Company with a $500 million secured reserve-based revolving credit facility with an initial borrowing base of $150 million . The maturity date of the Amended and Restated Credit Agreement is August 31, 2022 and automatically extends to March 2023 upon the payment in full of the Second Lien Notes. The borrowing base is re-determined semi-annually, with the lenders and the Company each having the right to one interim unscheduled redetermination between any two consecutive semi-annual redeterminations. The first redetermination date occurred on June 29, 2018, increasing the borrowing base from $150 million to $210 million and then it was increased to $220 million on December 5, 2018. Beginning in 2019, redeterminations will occur on April 1 and October 1. On March 28, 2019, the borrowing base was increased to $300 million . The amounts outstanding under the Amended and Restated Credit Agreement are secured by first priority liens on substantially all of Rosehill Operating’s oil and natural gas properties and associated assets and all of the stock of Rosehill Operating’s material operating subsidiaries that are guarantors of the Amended and Restated Credit Agreement. If an event of default occurs under the Amended and Restated Credit Agreement, JPMorgan Chase Bank, N.A. will have the right to proceed against the pledged capital stock and take control of substantially all of Rosehill Operating and Rosehill Operating’s material operating subsidiaries that are guarantors’ assets. There are currently no guarantors under the Amended and Restated Credit Agreement. The Amended and Restated Credit Agreement contains various affirmative and negative covenants. These covenants may limit Rosehill Operating’s ability to, among other things: incur additional indebtedness; make loans to others; make investments; enter into mergers; make or declare dividends or distributions; enter into commodity hedges exceeding a specified percentage of Rosehill Operating’s expected production; enter into interest rate hedges exceeding a specified percentage of Rosehill Operating’s outstanding indebtedness; incur liens; sell assets; and engage in certain other transactions without the prior consent of JPMorgan Chase Bank, N.A. and/or the lenders. The Amended and Restated Credit Agreement also requires Rosehill Operating to maintain the following financial ratios: (1) commencing on March 31, 2018, a current ratio, which is the ratio of consolidated current assets (including unused commitments under the Amended and Restated Credit Agreement, but excluding non-cash assets) to consolidated current liabilities (excluding non-cash obligations, current maturities under the Amended and Restated Credit Agreement and the Note Purchase Agreement (as defined below)), of not less than 1.0 to 1.0 ; (2) (x) commencing on March 31, 2018, a leverage ratio, which is the ratio of the sum of all of Rosehill Operating’s Total Debt to Annualized EBITDAX (as such terms are defined in the Amended and Restated Credit Agreement) for the four fiscal quarters then ended, of not greater than 4.0 to 1.0 and (y) commencing on and after repayment in full of the Second Lien Notes (other than surviving contingent indemnification obligations) and the repayment or redemption in full of the Series B Preferred Stock, a leverage ratio, which is the ratio of the sum of all of Rosehill Operating’s Net Debt to Annualized EBITDAX (as such terms are defined in the Amended and Restated Credit Agreement), of not greater than 4.0 to 1.0 and (3) commencing on March 31, 2018 for so long as the Series B Preferred Stock remains outstanding, a coverage ratio, which is the ratio of (i) EBITDAX (as defined in the Amended and Restated Credit Agreement) to (ii) the sum of (x) Interest Expense (as defined in the Amended and Restated Credit Agreement) plus (y) the aggregate amount of Restricted Payments (as defined in the Amended and Restated Credit Agreement) made in cash pursuant to Sections 9.04(a)(iv) and (v) of the Amended and Restated Credit Agreement during the preceding four fiscal quarters, of not less than 2.5 to 1.0 . The Company was in compliance with the current ratio, leverage ratio and coverage ratio in the Amended and Restated Credit Agreement for the measurement period ended December 31, 2018 . Second Lien Notes On December 8, 2017, Rosehill Operating issued and sold $100,000,000 in aggregate principal amount of 10.00% Senior Secured Second Lien Notes due January 31, 2023 to EIG Global Energy Partners, LLC (“EIG”) under and pursuant to the terms of that certain Note Purchase Agreement, dated as of December 8, 2017 (as amended by the Limited Consent and First Amendment to Note Purchase Agreement, dated as of March 28, 2018, the “Note Purchase Agreement”), among Rosehill Operating, the Company, the holders of the Second Lien Notes party thereto (the “Holders”) and U.S. Bank National Association, as agent and collateral agent on behalf of the Holders. The Second Lien Notes were issued and sold to the Holders in a private placement exempt from the registration requirements under the Securities Act of 1933, as amended (such issuance and sale, the “Notes Purchase”). Under the Note Purchase Agreement, Rosehill Operating may, at its option, redeem the Second Lien Notes in whole or in part, together with accrued and unpaid interest thereon, (i) at any time after December 8, 2019 but on or prior to December 8, 2020, at a redemption price equal to 103% of the principal amount of the Second Lien Notes being redeemed, (ii) at any time after December 8, 2020 but on or prior to December 8, 2021, at a redemption price equal to 101.5% of the principal amount of the Second Lien Notes being redeemed and (iii) at any time after December 8, 2021, at a redemption price equal to the principal amount of the Second Lien Notes being redeemed. On or prior to December 8, 2019, Rosehill Operating may, at its option, redeem the Second Lien Notes in whole or in part, together with accrued and unpaid interest thereon, at a redemption price equal to 103% of the principal amount of the Second Lien Notes being redeemed plus an additional make-whole premium set forth in the Note Purchase Agreement. The Second Lien Notes may become subject to redemption under certain other circumstances, including upon the incurrence of non-permitted debt or, subject to various exceptions, reinvestments rights and prepayment or redemption rights with respect to other debt or equity of Rosehill Operating, upon an asset sale, hedge termination or casualty event. Rosehill Operating will be further required to make an offer to redeem the Second Lien Notes upon a Change in Control (as defined in the Note Purchase Agreement) at a redemption price equal to 101% of the principal amount being redeemed. Other than in connection with a change in control or casualty event, the redemption prices and make-whole premium described in the foregoing paragraph shall also apply, at such times and to the extent set forth therein, to any mandatory redemption of the Second Lien Notes or any acceleration of the Second Lien Notes prior to the stated maturity thereof upon the occurrence of an event of default. The Note Purchase Agreement requires Rosehill Operating to maintain a leverage ratio, which is the ratio of the sum of all of Rosehill Operating’s Total Debt to Annualized EBITDAX (as such terms are defined in the Note Purchase Agreement) for the four fiscal quarters then ended, of not greater than 4.00 to 1.00 . The Note Purchase Agreement contains various affirmative and negative covenants, events of default and other terms and provisions that are based largely on the Amended and Restated Credit Agreement, with a number of important modifications reflecting the second lien nature of the Second Lien Notes and certain other terms that were agreed to with the Holders. The negative covenants may limit Rosehill Operating’s ability to, among other things, incur additional indebtedness (including under senior unsecured notes), make investments, make or declare dividends or distributions, redeem its preferred equity, acquire or dispose of oil and gas properties and other assets or engage in certain other transactions without the prior consent of the Holders, subject to various exceptions, qualifications and value thresholds. Rosehill Operating is also required to meet minimum commodity hedging levels based on its expected production on an ongoing basis. The Company is subject to certain limited restrictions under the Note Purchase Agreement, including (without limitation) a negative pledge with respect to its equity interests in Rosehill Operating and a contingent obligation to guarantee the Second Lien Notes upon request by the Holders in the event that the Company incurs debt obligations. The obligations of Rosehill Operating under the Note Purchase Agreement are secured on a second-lien basis by the same collateral that secures its first-lien obligations. In connection with the Notes Purchase, Rosehill Operating has granted first-lien and second-lien security interests over additional collateral to meet the minimum mortgage requirements under the Note Purchase Agreement. The Company was in compliance with the financial covenants in the Note Purchase Agreement for the measurement period ended December 31, 2018 . Tema Credit Agreement In December 2012, Tema entered into a secured line of credit with a bank for $60.0 million (the “Tema Credit Agreement”), with an optional expansion to $75.0 million , subject to satisfactory credit underwriting. Borrowings under the Tema Credit Agreement bore interest at floating LIBOR plus 1.00% (the Applicable Margin), and was collateralized by the existing producing oil and natural gas properties. There was no principal amortization required until the expiration of the Tema Credit Agreement, when all outstanding amounts became due. Upon the closing of the Transaction on April 27, 2017, the $55.0 million outstanding balance under the Tema Credit Agreement was assumed by Rosehill Operating and immediately paid off using proceeds from the issuance of preferred stock in the Transaction. Concurrent with the initial draw down of the Tema Credit Agreement, an interest rate swap was entered into with a bank to fix the interest rate of the Tema Credit Agreement. In anticipation of the closing of the Transaction on April 20, 2017, the interest rate swap was terminated. Debt Maturities The following are maturities of long-term debt for each of the next five years and thereafter (amounts in thousands): 2019 $ — 2020 — 2021 — 2022 194,000 2023 100,000 Total $ 294,000 Deferred Financing Costs and Debt Discount The Company capitalizes discounts and certain direct costs associated with the issuance of debt and amortizes such costs over the lives of the respective debt instruments. The Company amortized debt issuance costs and discounts of $2.1 million , $0.3 million and $0.1 million for the years ended December 31, 2018 , 2017 and 2016, respectively. The deferred financing costs related to the Amended and Restated Credit Agreement are classified in prepaid assets and the deferred financing costs and discounts related to the Second Lien Notes are netted against the long-term debt. The following table summarizes the Company’s deferred financing costs and debt discounts: December 31, December 31, 2018 2017 (In thousands) Revolving credit facility Debt issuance costs $ 2,368 $ 1,219 Accumulated amortization of debt issuance costs (361 ) (541 ) Net deferred costs - Revolving credit facility $ 2,007 $ 678 Second Lien Notes Debt discount $ 3,000 $ 3,000 Accumulated amortization of debt discount (509 ) (29 ) Debt issuance costs 3,868 3,868 Accumulated amortization of debt issuance costs (657 ) (38 ) Net deferred costs - Second Lien Notes $ 5,702 $ 6,801 Total deferred financing costs and debt discount, net $ 7,709 $ 7,479

10% Series B Redeemable Preferr

10% Series B Redeemable Preferred Stock	12 Months Ended
	Dec. 31, 2018
Temporary Equity Disclosure [Abstract]
10% Series B Redeemable Preferred Stock	10% Series B Redeemable Preferred Stock On December 8, 2017, in connection with the acquisition of mineral rights, royalty interest and other associated assets in the Southern Delaware Basin (the “White Wolf Acquisition”), the Company entered into a Series B Redeemable Preferred Stock Purchase Agreement (the “Series B Preferred Stock Agreement”) to issue 150,000 shares of the Company’s 10.00% Series B Redeemable Preferred Stock, par value of $0.0001 per share (the “Series B Preferred Stock”), for an aggregate purchase price of $150.0 million , less transaction costs, advisory and up-front fees of approximately $10.0 million to certain private funds and accounts managed by EIG (collectively, the “Series B Preferred Stock Purchasers”). The Company has the option, subject to certain conditions, to sell from time to time up to an additional 50,000 shares of Series B Preferred Stock, in aggregate, to the Series B Preferred Stock Purchasers and their transferees for a purchase price of $1,000 per share of Series B Preferred Stock. Such option terminated on December 8, 2018. Holders of the Series B Preferred Stock are entitled to receive, when, as and if declared by the Board of Directors of the Company (the “Board”), cumulative dividends in cash, at a rate of 10.00% per annum on the $1,000 liquidation preference per share of Series B Preferred Stock, payable quarterly in arrears on January 15, April 15, July 15 and October 15 of each year, commencing on January 15, 2018. With respect to dividends declared for any quarter ending on or prior to January 15, 2019, the Company may elect to pay as dividends additional shares of Series B Preferred Stock in kind (the “Series B PIK Shares”) in an amount up to 40% of that which would have been payable had the dividends been fully paid in cash. Holders of the Series B Preferred Stock have no voting rights and have limited consent rights with respect to the taking of certain corporate actions by the Company. Upon the Company’s voluntary or involuntary liquidation, winding-up or dissolution, each holder of Series B Preferred Stock will be entitled to receive the Base Return Amount (as defined in the Series B Preferred Stock Agreement) plus accrued and unpaid dividends. The shares of Series B Preferred Stock are redeemable by the Company at the election of the holders on or after December 8, 2023, and upon certain conditions and at any time at the Company’s option. As the holders of Series B Preferred Stock have an option to redeem the Series B Preferred Stock at a future date, the proceeds from the Series B Preferred Stock have been included in temporary, or “mezzanine” equity, between total liabilities and stockholders’ equity on the Consolidated Balance Sheets. The Series B Preferred Stock, while not currently redeemable at the option of the holders, are considered probable of becoming redeemable and therefore will be subsequently remeasured each reporting period by accreting the initial value to the estimated redemption date of December 8, 2023 when the Series B Preferred Stock is redeemable in whole or in part at the election of the holders of Series B Preferred Stock. The accretion is presented as a deemed dividend and recorded in mezzanine equity on the Consolidated Balance Sheets and within preferred dividends on the Consolidated Statements of Operations. In addition to the 10.00% per annum cumulative dividend holders of the Series B Preferred Stock are entitled to receive, upon redemption of the Series B Preferred Stock, such holders are guaranteed a base return on the initial 150,000 shares purchased in an amount equal to (1) $1,250 per share of Series B Preferred Stock times the number of outstanding shares of Series B Preferred Stock if the Company redeems the shares prior to the first anniversary of the date of issuance of such share of Series B Preferred Stock; (2) $1,350 per share of Series B Preferred Stock times the number of outstanding shares of Series B Preferred Stock if the Company redeems the shares on or after the first anniversary and prior to the second anniversary of the date of issuance of such share of Series B Preferred Stock; and (3) on or after the second anniversary of the date of issuance of such share of Series B Preferred Stock, the greater of (x) $1,500 per share of Series B Preferred Stock and (y) an amount necessary to achieve a 16% IRR (the “Base Return Amount”) with respect to such shares of Series B Preferred Stock. Since the Series B Preferred Stock can be redeemed by the holders on or after December 23, 2023 and management has no plans to redeem before that date, the Company has accrued a guaranteed return amount in order to achieve the 16% IRR. In the event of a change of control, the Company shall redeem in cash all of the outstanding shares of Series B Preferred Stock, excluding Series B PIK Shares, for a price per share equal to the Base Return Amount and all Series B PIK Shares at the purchase price of $1,000 per share. The Company assessed the change of control feature and determined that the redemption of the outstanding shares of Series B Preferred Stock, excluding Series B PIK Shares, for a price per share equal to the Base Return Amount was an embedded derivative that requires bifurcation and shall be accounted for at fair value. The Company measured the derivative liability and recorded a discount of $0.6 million upon initial measurement. The Company reflected the following in mezzanine equity for the Series B Preferred Stock as of December 31, 2018 : Series B Preferred Shares Series B Preferred Stock Guaranteed Return Total (In thousands, except share data) Total Series B Preferred Stock at January 1, 2017 — $ — — — Issuance of Series B Preferred Stock 150,000 $ 150,000 $ — $ 150,000 Discount - upfront fees — (4,000 ) — (4,000 ) Discount - transaction costs — (6,017 ) — (6,017 ) Discount - bifurcated derivative — (625 ) — (625 ) Net Proceeds 150,000 139,358 — 139,358 Return (16% IRR) — — 2,273 2,273 Dividends declared and payable in cash — — (937 ) (937 ) Dividends declared and paid-in-kind 626 626 (626 ) — Accretion of Discount - deemed dividend — 174 — 174 Total Series B Preferred Stock at December 31, 2017 150,626 140,158 710 140,868 Discount - transaction costs — (20 ) — (20 ) Return (16% IRR) — — 22,092 22,092 Dividends declared and paid or payable in cash — — (9,174 ) (9,174 ) Dividends declared and paid-in-kind 6,120 6,120 (6,120 ) — Accretion of discount - deemed dividend — 1,345 — 1,345 Total Series B Preferred Stock at December 31, 2018 156,746 $ 147,603 $ 7,508 $ 155,111 For the first quarter, second quarter, third quarter, and fourth quarter of 2018, dividends per share on the Company’s Series B Preferred Stock was $24.66 , $24.93 , $25.21 and $25.21 , respectively. For each quarter in 2018, the dividends on the Company’s Series B Preferred Stock were paid 60% in cash and 40% paid-in-kind. Stockholders’ Equity The following description summarizes the material terms and provisions of the securities that the Company has authorized. Prior to the Transaction, KLRE was a shell company with no operations, formed as a vehicle to effect a business combination with one or more operating businesses. After the closing of the Transaction, the Company became a holding company whose sole material asset is its interest in Rosehill Operating. The following table summarizes the changes in the outstanding preferred stock, common stock and Class A common warrants exercisable for shares of Class A Common Stock through the date of the Transaction. Series A Class A Class B Class F Total Class A Warrants Issued at formation — 588,276 — 4,312,500 4,900,776 588,276 Issued at IPO — 7,597,044 — — 7,597,044 7,597,044 Issued in connection with private placement — — — — — 8,408,838 Forfeitures/Cancellation of founder shares — — — (2,266,170 ) (2,266,170 ) — Conversion of founder shares — 3,475,665 — (2,046,330 ) 1,429,335 — Redemption of Class A shares — (5,804,404 ) — — (5,804,404 ) — Issued to Tema in connection with the Transaction — — 29,807,692 — 29,807,692 4,000,000 Preferred stock and warrants issued to PIPE Investors 75,000 — — — — 5,000,000 Preferred stock issued to Sponsor and Rosemore Holdings, Inc. 20,000 — — — — — Outstanding at the Transaction date 95,000 5,856,581 29,807,692 — 35,664,273 25,594,158 Class A Common Stock. Holders of the Company’s Class A Common Stock are entitled to one vote for each share held on all matters to be voted on by the stockholders. Holders of the Class A Common Stock and holders of the Class B Common Stock voting together as a single class have the exclusive right to vote for the election of directors and on all other matters properly submitted to a vote of the stockholders. Additionally, the Sponsor and Tema agreed to restrictions on certain transfers of the Company’s securities, which include, subject to certain exceptions, restrictions on the transfer of (i) 33% of their common stock through the first anniversary of the closing date of the Transaction, which restrictions lapsed on April 27, 2018, and (ii) 67% of their common stock through the second anniversary of the closing date, provided that sales of common stock above $18.00 per share will be permitted between the first and second anniversaries of the closing date of the Transaction. Further, in connection with underwritten offerings by the Sponsor and Tema, and subject to certain conditions, sales of common stock at a price reasonably expected to equal or exceed $18.00 per share and in any case equal to or in excess of $16.00 per share will be permitted. On September 27, 2018 , the Company entered into an underwriting agreement (the “Underwriting Agreement”) with Citigroup Global Markets Inc., as representative of the several underwriters named therein (the “Underwriters”), for a public offering of 6,150,000 shares of common stock (the “Class A Common Stock Offering”) at a public offering price of $6.10 per share ( $5.795 per share net of underwriting discount and commissions). Pursuant to the Underwriting Agreement, the Company granted the Underwriters a 30-day option to purchase up to an additional 922,500 shares of Class A Common Stock. On October 2, 2018 , upon the closing of the Class A Common Stock Offering, the Company issued 6,150,000 shares of Class A Common Stock. The Company’s net proceeds from the Class A Common Stock Offering, net of underwriting discounts and commissions and offering costs, was $34.5 million . On October 5, 2018 , the Underwriters exercised their option to purchase an additional 840,744 shares of Class A Common Stock at the Underwriters’ price of $5.795 per share. The Company received net proceeds of approximately $4.9 million for the shares of Class A Common Stock sold pursuant to the exercise of the Underwriters’ option. The Company contributed all of the net proceeds from the Class A Common Stock Offering and the exercise of the Underwriters’ option to Rosehill Operating in exchange for Rosehill Operating Common Units. Class B Common Stock. Shares of Class B Common Stock may be issued only to Tema, their respective successors and assignees, as well as any permitted transferees of Tema. A holder of Class B Common Stock may transfer shares of Class B Common Stock to any transferee (other than the Company) only if such holder also simultaneously transfers an equal number of such holder’s Rosehill Operating Common Units to such transferee in compliance with the LLC Agreement. Holders of the Company’s Class B Common Stock will vote together as a single class with holders of the Company’s Class A Common Stock on all matters properly submitted to a vote of the stockholders. Holders of Class B Common Stock generally have the right to cause the Company to redeem all or a portion of their Rosehill Operating Common Units in exchange for shares of the Company’s Class A Common Stock on a one-to-one basis or, at the Company’s option, an equivalent amount of cash. The Company may, however, at its option, affect a direct exchange of cash or Class A Common Stock for such Rosehill Operating Common Units in lieu of such a redemption. Upon the future redemption or exchange of Rosehill Operating Common Units, a corresponding number of shares of Class B Common Stock will be canceled. In the Transaction, the Company issued to Rosehill Operating 29,807,692 shares of its Class B Common Stock and 4,000,000 warrants exercisable for shares of its Class A Common Stock in exchange for 4,000,000 warrants exercisable for Rosehill Operating Common Units. Rosehill Operating immediately distributed the warrants and shares of Class B Common Stock to Tema. Class F Common Stock. Upon the completion of the Transaction in April 2017, all of the outstanding Class F Common Stock (the “Founder Shares”) were automatically converted into 3,475,665 shares of Class A Common Stock in connection with the Transaction. As used herein, unless the context otherwise requires, the Founder Shares are deemed to include the shares of Class A Common Stock issued upon conversion of the Founder Shares and such converted shares continue to be subject to certain transfer restrictions. 8% Series A Cumulative Perpetual Convertible Preferred Stock. Each share of Series A Preferred Stock has a liquidation preference of $1,000 per share and is convertible, at the holder’s option at any time, initially into 86.9565 shares of the Company’s Class A Common Stock (which is equivalent to an initial conversion price of approximately $11.50 per share of Class A Common Stock), subject to specified adjustments and limitations as set forth in the Certificate of Designation of Series A Preferred Stock (the “Certificate of Designation”). Under certain circumstances, the Company will increase the conversion rate upon a “fundamental change” as described in the Certificate of Designation. The Company contributed the net proceeds of $70.8 million from its issuance of 75,000 shares of Series A Preferred Stock and 5,000,000 warrants exercisable for shares of Class A Common Stock to Rosehill Operating. In connection with the issuance of the Series A Preferred Stock, the Sponsor transferred 476,540 shares of its Class A Common Stock to the PIPE Investors to consummate the Transaction. The net proceeds from the issuance of these shares of Series A Preferred Stock and warrants was attributed to the Series A Preferred Stock, warrants and Class A Common Stock contributed by the Sponsor to the PIPE Investors based on the relative fair value of those securities using, among other factors, the closing price of the Class A Common Stock and the closing price of the warrants on April 27, 2017. Rosemore and the Sponsor backstopped redemptions by the public stockholders of the Company once 30% of the outstanding shares of Class A Common Stock were redeemed by purchasing 20,000 shares of Series A Preferred Stock for net proceeds of $20 million pursuant to a side letter entered into between Rosemore, the Sponsor and the Company. The Company contributed to Rosehill Operating the net proceeds from the issuance of 20,000 shares of Series A Preferred Stock to Rosemore Holdings, Inc. and the Sponsor. Upon issuance of the Series A Preferred Stock in April 2017, the nondetachable conversion option embedded in the Series A Preferred Stock was evaluated pursuant to ASC 470-20 and the Company determined that a beneficial conversion feature existed as of the closing date of the Transaction. The beneficial conversion feature was recognized separately from the Series A Preferred Stock in the Company’s consolidated financial statements. The Company recognized in additional paid-in-capital, with an offsetting reduction in the carrying amount of the Series A Preferred Stock, the value of the beneficial conversion feature at the commitment date of $6.7 million . Since the Company’s Series A Preferred Stock is perpetual and has no stated maturity date and no restrictions on conversion, the value attributable to the nondetachable conversion option was recognized immediately as a non-cash deemed dividend on the date that the Series A Preferred Stock was issued. Future issuances of Series A Preferred Stock resulting from dividends paid-in-kind may, depending on the trading price per share of the Company’s Class A Common Stock on the dividend date, contain a beneficial conversion option determined on the same basis as described above and, thus, result in additional non-cash deemed dividends which will reduce net income attributable to Rosehill Resources, Inc. common stockholders when such paid-in-kind shares of Series A Preferred Stock are granted. The Company also ratably recognizes additional non-cash deemed dividends attributable to the Series A Preferred Stock discount which was created by the issuance of the warrants exercisable for shares of Class A Common Stock and the contribution of the Class A Common Stock, as the Series A Preferred Stock which was sold to the PIPE Investors is converted. Also, upon Series A Preferred Stock conversions, non-cash deemed dividends will be recognized and will reduce net income attributable to Rosehill Resources Inc. common stockholders. The Company reflected the following in equity for the Series A Preferred Stock as of December 31, 2018 : December 31, 2018 2017 (In thousands) Liquidation Preference $ 101,669 $ 97,698 Discount (17,038 ) (17,038 ) Series A Preferred Stock $ 84,631 $ 80,660 The table below summarizes the Series A Preferred Stock dividends reflected in the Company’s Consolidated Statements of Operations: Year Ended December 31, 2018 2017 (In thousands) Series A Preferred Stock paid-in-kind $ 3,971 $ 5,530 Series A Preferred Stock paid or payable in cash 3,967 38 Series A Preferred Stock dividends 7,938 5,568 Deemed dividend related to beneficial conversion feature — 6,700 Deemed dividend related to conversion to Class A Common Stock — 668 Series A Preferred Stock dividends and deemed dividends $ 7,938 $ 12,936 For the first quarter, second quarter, third quarter, and fourth quarter of 2018, dividends per share on the Company’s Series A Preferred Stock was $19.73 , $19.95 , $20.16 and $20.16 , respectively. For each quarter in 2018, the dividends on the Company’s Series A Preferred Stock were paid 50% in cash and 50% paid-in-kind. Warrants. Each of the Company’s warrants entitles the registered holder to purchase one share of the Company’s Class A Common Stock at a price of $11.50 per share, subject to adjustment pursuant to the terms of the warrant agreement. The warrants have a five-year term which commenced on April 27, 2017, upon the completion of the Transaction, and will expire on April 27, 2022. The Company may call the warrants for redemption if the reported last sale price of the Class A Common Stock equals or exceeds $21.00 per share for any 20 trading days within a 30 -trading day period ending on the third trading day prior to the date the Company sends the notice of redemption to the warrant holders. There were 588,276 warrants issued in connection with the formation of the Company and 7,597,044 public warrants (the “Public Warrants”) issued in connection with KLRE’s initial public offering. Additionally, there were 8,408,838 warrants issued to the Sponsor and EarlyBirdCapital Inc. pursuant to a private placement (the “Private Placement Warrants”) in connection with the Company’s initial public offering. The Private Placement Warrants are not redeemable by the Company and are exercisable on a cashless basis so long as they are held by the initial holders or their permitted transferees. Otherwise, the Private Placement Warrants have terms and provisions that are identical to those of the warrants described above. If the Private Placement Warrants are held by holders other than the initial holders or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by the holders on the same basis as the warrants described above. In connection with the closing of the Transaction, the Company issued 5,000,000 warrants to the PIPE Investors and 4,000,000 warrants to Tema. These warrants were issued on the same terms, and are subject to the same rights and obligations, as described above. As of December 31, 2018 , there were 25,594,158 warrants exercisable for shares of Class A Common Stock outstanding at a price of $11.50 . All warrants expire on April 27, 2022. Noncontrolling Interest. Noncontrolling interest represents the membership interest held by holders other than the Company. On April 27, 2017, upon the closing of the Transaction, the noncontrolling interest in Rosehill Operating, held by Tema, was approximately 83.6% . The Company has consolidated the financial position and results of operations of Rosehill Operating and reflected the proportionate interest held by Tema as a noncontrolling interest. The noncontrolling interest will change when shares of Series A Preferred Stock are converted into shares of Class A Common Stock, when shares of Class A Common Stock are issued in connection with the Company’s Long-Term Incentive Compensation plan and when Tema elects to exchange the Class B Common Stock received in connection with the transaction for shares of Class A Common Stock. At December 31, 2018 , Tema held an approximate 68.4% noncontrolling interest in Rosehill Operating.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes In 2017, the Company became the sole managing member of Rosehill Operating, the Company’s accounting predecessor. Rosehill Operating is a limited liability company that is treated as a partnership for U.S. federal income tax purposes and is not subject to U.S. federal income tax. Any taxable income or loss generated by Rosehill Operating is passed through to and included in the taxable income or loss of its members, including the Company. The Company is a C corporation and is subject to U.S. federal income tax and state and local income taxes. On December 22, 2017, the U.S. government enacted comprehensive tax legislation through Public Law No. 115-97, commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The provisions of the Tax Act that impact the Company include, but are not limited to, (1) reducing the U.S. federal corporate income tax rate from 35% to 21% ; (2) eliminating the corporate alternative minimum tax (“AMT”); (3) allowing businesses to immediately expense the cost of new investments in certain qualified depreciable assets acquired after September 27, 2017 (with a phase-down of such expensing starting in 2023), (4) reducing the maximum deduction for net operating loss (“NOL”) carryforwards generated in tax years beginning after December 31, 2017, to 80% of a taxpayer’s taxable income and (5) imposing additional limits on future deductibility of interest expense and certain executive compensation. In conjunction with the Tax Act, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (SAB 118), which provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. The Company booked no provisional amounts as of December 31, 2017 with respect to the Tax Act and no further adjustments were required during 2018. The SAB 118 period expired and our accounting is complete. We have calculated the impact of the Tax Act in our income tax provision in accordance with our understanding of the Tax Act and guidance available as of the date of this filing. As a result of the Tax Act, further clarifications and new regulations to the Tax Act continue to be issued at times. The Company will continue to monitor these new regulations and analyze their applicability and impact on the Company. The Company remeasured its deferred tax assets and liabilities at December 31, 2017 using the lower 21% rate, resulting in a decrease in net deferred tax assets and its valuation allowance. Aside from the reduction to the U.S. federal corporate income tax rate, the Tax Act is not expected to have a significant current impact to the Company. The ultimate impact of the Tax Act may differ from the Company’s estimates due to changes in interpretations or assumptions, as well as additional regulatory guidance that may be issued. The components of income tax expense were as follows for the periods indicated: Year Ended December 31, 2018 2017 2016 (In thousands) Current: State 5 — 148 5 — 148 Deferred: Federal 15,687 1,537 — State 2,470 153 — 18,157 1,690 — Income tax expense $ 18,162 $ 1,690 $ 148 The Company’s effective tax rate was 13.3% , 16.5% and 1.0% for the years ended December 31, 2018 , 2017 and 2016, respectively. The effective tax rate differs from the enacted statutory rate of 21% for the years ended December 31, 2018 and 35% for the year ended December 31, 2017 and 2016 primarily due to the allocation of profits and losses to Rosehill and the noncontrolling interest holder in accordance with the LLC Agreement and the impact of state income taxes. The following reconciles the income tax expense included in the consolidated statements of operations with the income tax expense that would result from the application of the statutory federal tax rate: Year Ended December 31, 2018 2017 2016 (In thousands) Income (Loss) before income taxes $ 136,124 $ (10,258 ) $ (15,041 ) Income tax expense (benefit) at federal statutory rate 28,586 (3,590 ) (5,264 ) Net (income) loss prior to transaction — (1,545 ) 5,264 Net (income) loss before income taxes attributable to noncontrolling interest (12,757 ) 6,584 — State income taxes, net of federal benefit 2,323 153 148 Nondeductible expenses — 88 — Effect of change in federal statutory rate — 1,941 — Change in valuation allowance — (1,941 ) — Other $ 10 $ — $ — Income tax expense $ 18,162 $ 1,690 $ 148 The components of the Company’s deferred tax balances were as follows for the periods indicated December 31, 2018 2017 (In thousands) Deferred tax assets: Deferred stock-based compensation — 232 Net operating loss carryforward 8,857 4,350 Other 16 30 Total deferred tax assets 8,873 4,612 Less: Valuation allowance — (2,912 ) Net deferred tax assets $ 8,873 $ 1,700 Deferred tax liabilities: Investment in Rosehill Operating (15,042 ) (1,700 ) State deferred tax liability (3,109 ) (153 ) Total deferred tax liabilities (18,151 ) (1,853 ) Net deferred tax liabilities $ (9,278 ) $ (153 ) As of December 31, 2018 , the Company had approximately $38.1 million of U.S. federal net operating loss carryovers, which will begin to expire in 2035 . The Company periodically assesses whether it is more likely than not that it will generate sufficient taxable income to realize its deferred tax assets, including NOL carry forwards. A valuation allowance for deferred tax assets is recognized when it is more likely than not that some or all of the benefit from the deferred tax asset will not be realized. As of December 31, 2018 , we have no valuation allowance because the Company thinks it is more likely than not that it’s deferred tax assets will be realized prior to their expiration. In making this determination, the Company considers all available positive and negative evidence and makes certain assumptions. The Company considers, among other things, its deferred tax liabilities, the overall business environment, its historical earnings and losses, current industry trends and its outlook for future years. Upon closing the Transaction, the Company acquired a portion of the Rosehill Operating Common Units and a deferred tax asset was recorded relating to the outside basis difference of its investment in Rosehill Operating for $5.7 million with an offsetting effect recorded in additional paid in capital. Due to uncertainties relating to the realization of the deferred tax asset at the time of the Transaction, the Company recorded a full valuation allowance with an offsetting effect recorded in additional paid in capital. Subsequent to the Transaction, the recognition of tax benefits resulted in a full reduction of the valuation allowance, with an offsetting effect recorded in additional paid in capital. Section 382 of the Internal Revenue Code of 1986, as amended (“IRC”), addresses company ownership changes and specifically limits the utilization of tax benefits generated prior to the Transaction following an ownership change. Upon closing of the Transaction, the Company believes it experienced an ownership change within the meaning of IRC Section 382 and recorded a valuation allowance of $0.2 million and an offsetting effect in additional paid in capital to fully offset these tax benefits. The Company is subject to the following material taxing jurisdictions: the United States, Texas and New Mexico. As of December 31, 2018 , the Company has no current tax years under audit. The Company remains subject to examination for federal income taxes and state income taxes for tax years 2016 through 2018. The Company has evaluated all tax positions for which the statute of limitations remains open and believes that the material positions taken would more likely than not be sustained upon examination. Therefore, as of December 31, 2018 , the Company had not established any reserves for, nor recorded any unrecognized benefits related to, uncertain tax positions. The Company’s policy is to recognize interest and penalties related to uncertain tax positions in income tax expense. Tax Receivable Agreement In connection with the Transaction, the Company entered into a tax receivable agreement (“Tax Receivable Agreement”) with the noncontrolling interest holder, Tema. The Tax Receivable Agreement provides that the Company will pay to Tema 90% of the net cash savings, if any, in U.S. federal, state and local income tax that the Company realizes (or is deemed to realize in certain circumstances) in periods beginning with and after the closing of the Transaction as a result of the following: (i) any tax basis increases in the assets of Rosehill Operating resulting from the distribution to Tema of the Cash Consideration, the shares of Class B Common Stock and the Tema warrants, all in connection with the Transaction, and resulting from the assumption of Tema liabilities in connection with the Transaction, (ii) the tax basis increases in the assets of Rosehill Operating resulting from a redemption by Rosehill Operating with respect to Tema and (iii) imputed interest deemed to be paid by the Company as a result of, and additional tax basis arising from, payments it makes under the Tax Receivable Agreement. The estimation of liability under the Tax Receivable Agreement is by its nature imprecise and subject to significant assumptions regarding the amount and timing of future taxable income. The Company is not obligated to make any payments under the Tax Receivable Agreement until the tax benefits associated with the transaction that gave rise to the payment are realized. Amounts payable under the Tax Receivable Agreement are contingent upon, among other things, (i) generation of future taxable income over the term of the Tax Receivable Agreement and (ii) future changes in tax laws. If the Company does not generate sufficient taxable income in the aggregate over the term of the Tax Receivable Agreement to utilize the tax benefits, then the Company would not be required to make the related Tax Receivable Agreement payment. As of December 31, 2018, the Company recognized a Tax Receivable Agreement liability of approximately $3.5 million after concluding that it was probable that we would have sufficient future taxable income to utilize the related tax benefits. If and when Tema exercises its right to cause the Company to redeem all or a portion of its Rosehill Operating Common Units, a liability under the Tax Receivable Agreement relating to such redemption will be recorded. The amount of liability will be based on 90% of the estimated future cash tax savings that the Company will realize as a result of increases in the basis of Rosehill Operating’s assets attributed to the Company resulting from such redemption. The amount of the increase in asset basis, the related estimated cash tax savings and the attendant Tax Receivable Agreement liability will depend, in part, on the price of the Class A Common Stock at the time of the relevant redemption. Due to the uncertainty surrounding the amount and timing of future redemptions of Rosehill Operating Common Units by Tema, the Company does not believe it is appropriate to record additional Tax Receivable Agreement liability until such time that Rosehill Operating Common Units are redeemed for shares of Class A Common Stock or cash.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Stockholders' Equity	10% Series B Redeemable Preferred Stock On December 8, 2017, in connection with the acquisition of mineral rights, royalty interest and other associated assets in the Southern Delaware Basin (the “White Wolf Acquisition”), the Company entered into a Series B Redeemable Preferred Stock Purchase Agreement (the “Series B Preferred Stock Agreement”) to issue 150,000 shares of the Company’s 10.00% Series B Redeemable Preferred Stock, par value of $0.0001 per share (the “Series B Preferred Stock”), for an aggregate purchase price of $150.0 million , less transaction costs, advisory and up-front fees of approximately $10.0 million to certain private funds and accounts managed by EIG (collectively, the “Series B Preferred Stock Purchasers”). The Company has the option, subject to certain conditions, to sell from time to time up to an additional 50,000 shares of Series B Preferred Stock, in aggregate, to the Series B Preferred Stock Purchasers and their transferees for a purchase price of $1,000 per share of Series B Preferred Stock. Such option terminated on December 8, 2018. Holders of the Series B Preferred Stock are entitled to receive, when, as and if declared by the Board of Directors of the Company (the “Board”), cumulative dividends in cash, at a rate of 10.00% per annum on the $1,000 liquidation preference per share of Series B Preferred Stock, payable quarterly in arrears on January 15, April 15, July 15 and October 15 of each year, commencing on January 15, 2018. With respect to dividends declared for any quarter ending on or prior to January 15, 2019, the Company may elect to pay as dividends additional shares of Series B Preferred Stock in kind (the “Series B PIK Shares”) in an amount up to 40% of that which would have been payable had the dividends been fully paid in cash. Holders of the Series B Preferred Stock have no voting rights and have limited consent rights with respect to the taking of certain corporate actions by the Company. Upon the Company’s voluntary or involuntary liquidation, winding-up or dissolution, each holder of Series B Preferred Stock will be entitled to receive the Base Return Amount (as defined in the Series B Preferred Stock Agreement) plus accrued and unpaid dividends. The shares of Series B Preferred Stock are redeemable by the Company at the election of the holders on or after December 8, 2023, and upon certain conditions and at any time at the Company’s option. As the holders of Series B Preferred Stock have an option to redeem the Series B Preferred Stock at a future date, the proceeds from the Series B Preferred Stock have been included in temporary, or “mezzanine” equity, between total liabilities and stockholders’ equity on the Consolidated Balance Sheets. The Series B Preferred Stock, while not currently redeemable at the option of the holders, are considered probable of becoming redeemable and therefore will be subsequently remeasured each reporting period by accreting the initial value to the estimated redemption date of December 8, 2023 when the Series B Preferred Stock is redeemable in whole or in part at the election of the holders of Series B Preferred Stock. The accretion is presented as a deemed dividend and recorded in mezzanine equity on the Consolidated Balance Sheets and within preferred dividends on the Consolidated Statements of Operations. In addition to the 10.00% per annum cumulative dividend holders of the Series B Preferred Stock are entitled to receive, upon redemption of the Series B Preferred Stock, such holders are guaranteed a base return on the initial 150,000 shares purchased in an amount equal to (1) $1,250 per share of Series B Preferred Stock times the number of outstanding shares of Series B Preferred Stock if the Company redeems the shares prior to the first anniversary of the date of issuance of such share of Series B Preferred Stock; (2) $1,350 per share of Series B Preferred Stock times the number of outstanding shares of Series B Preferred Stock if the Company redeems the shares on or after the first anniversary and prior to the second anniversary of the date of issuance of such share of Series B Preferred Stock; and (3) on or after the second anniversary of the date of issuance of such share of Series B Preferred Stock, the greater of (x) $1,500 per share of Series B Preferred Stock and (y) an amount necessary to achieve a 16% IRR (the “Base Return Amount”) with respect to such shares of Series B Preferred Stock. Since the Series B Preferred Stock can be redeemed by the holders on or after December 23, 2023 and management has no plans to redeem before that date, the Company has accrued a guaranteed return amount in order to achieve the 16% IRR. In the event of a change of control, the Company shall redeem in cash all of the outstanding shares of Series B Preferred Stock, excluding Series B PIK Shares, for a price per share equal to the Base Return Amount and all Series B PIK Shares at the purchase price of $1,000 per share. The Company assessed the change of control feature and determined that the redemption of the outstanding shares of Series B Preferred Stock, excluding Series B PIK Shares, for a price per share equal to the Base Return Amount was an embedded derivative that requires bifurcation and shall be accounted for at fair value. The Company measured the derivative liability and recorded a discount of $0.6 million upon initial measurement. The Company reflected the following in mezzanine equity for the Series B Preferred Stock as of December 31, 2018 : Series B Preferred Shares Series B Preferred Stock Guaranteed Return Total (In thousands, except share data) Total Series B Preferred Stock at January 1, 2017 — $ — — — Issuance of Series B Preferred Stock 150,000 $ 150,000 $ — $ 150,000 Discount - upfront fees — (4,000 ) — (4,000 ) Discount - transaction costs — (6,017 ) — (6,017 ) Discount - bifurcated derivative — (625 ) — (625 ) Net Proceeds 150,000 139,358 — 139,358 Return (16% IRR) — — 2,273 2,273 Dividends declared and payable in cash — — (937 ) (937 ) Dividends declared and paid-in-kind 626 626 (626 ) — Accretion of Discount - deemed dividend — 174 — 174 Total Series B Preferred Stock at December 31, 2017 150,626 140,158 710 140,868 Discount - transaction costs — (20 ) — (20 ) Return (16% IRR) — — 22,092 22,092 Dividends declared and paid or payable in cash — — (9,174 ) (9,174 ) Dividends declared and paid-in-kind 6,120 6,120 (6,120 ) — Accretion of discount - deemed dividend — 1,345 — 1,345 Total Series B Preferred Stock at December 31, 2018 156,746 $ 147,603 $ 7,508 $ 155,111 For the first quarter, second quarter, third quarter, and fourth quarter of 2018, dividends per share on the Company’s Series B Preferred Stock was $24.66 , $24.93 , $25.21 and $25.21 , respectively. For each quarter in 2018, the dividends on the Company’s Series B Preferred Stock were paid 60% in cash and 40% paid-in-kind. Stockholders’ Equity The following description summarizes the material terms and provisions of the securities that the Company has authorized. Prior to the Transaction, KLRE was a shell company with no operations, formed as a vehicle to effect a business combination with one or more operating businesses. After the closing of the Transaction, the Company became a holding company whose sole material asset is its interest in Rosehill Operating. The following table summarizes the changes in the outstanding preferred stock, common stock and Class A common warrants exercisable for shares of Class A Common Stock through the date of the Transaction. Series A Class A Class B Class F Total Class A Warrants Issued at formation — 588,276 — 4,312,500 4,900,776 588,276 Issued at IPO — 7,597,044 — — 7,597,044 7,597,044 Issued in connection with private placement — — — — — 8,408,838 Forfeitures/Cancellation of founder shares — — — (2,266,170 ) (2,266,170 ) — Conversion of founder shares — 3,475,665 — (2,046,330 ) 1,429,335 — Redemption of Class A shares — (5,804,404 ) — — (5,804,404 ) — Issued to Tema in connection with the Transaction — — 29,807,692 — 29,807,692 4,000,000 Preferred stock and warrants issued to PIPE Investors 75,000 — — — — 5,000,000 Preferred stock issued to Sponsor and Rosemore Holdings, Inc. 20,000 — — — — — Outstanding at the Transaction date 95,000 5,856,581 29,807,692 — 35,664,273 25,594,158 Class A Common Stock. Holders of the Company’s Class A Common Stock are entitled to one vote for each share held on all matters to be voted on by the stockholders. Holders of the Class A Common Stock and holders of the Class B Common Stock voting together as a single class have the exclusive right to vote for the election of directors and on all other matters properly submitted to a vote of the stockholders. Additionally, the Sponsor and Tema agreed to restrictions on certain transfers of the Company’s securities, which include, subject to certain exceptions, restrictions on the transfer of (i) 33% of their common stock through the first anniversary of the closing date of the Transaction, which restrictions lapsed on April 27, 2018, and (ii) 67% of their common stock through the second anniversary of the closing date, provided that sales of common stock above $18.00 per share will be permitted between the first and second anniversaries of the closing date of the Transaction. Further, in connection with underwritten offerings by the Sponsor and Tema, and subject to certain conditions, sales of common stock at a price reasonably expected to equal or exceed $18.00 per share and in any case equal to or in excess of $16.00 per share will be permitted. On September 27, 2018 , the Company entered into an underwriting agreement (the “Underwriting Agreement”) with Citigroup Global Markets Inc., as representative of the several underwriters named therein (the “Underwriters”), for a public offering of 6,150,000 shares of common stock (the “Class A Common Stock Offering”) at a public offering price of $6.10 per share ( $5.795 per share net of underwriting discount and commissions). Pursuant to the Underwriting Agreement, the Company granted the Underwriters a 30-day option to purchase up to an additional 922,500 shares of Class A Common Stock. On October 2, 2018 , upon the closing of the Class A Common Stock Offering, the Company issued 6,150,000 shares of Class A Common Stock. The Company’s net proceeds from the Class A Common Stock Offering, net of underwriting discounts and commissions and offering costs, was $34.5 million . On October 5, 2018 , the Underwriters exercised their option to purchase an additional 840,744 shares of Class A Common Stock at the Underwriters’ price of $5.795 per share. The Company received net proceeds of approximately $4.9 million for the shares of Class A Common Stock sold pursuant to the exercise of the Underwriters’ option. The Company contributed all of the net proceeds from the Class A Common Stock Offering and the exercise of the Underwriters’ option to Rosehill Operating in exchange for Rosehill Operating Common Units. Class B Common Stock. Shares of Class B Common Stock may be issued only to Tema, their respective successors and assignees, as well as any permitted transferees of Tema. A holder of Class B Common Stock may transfer shares of Class B Common Stock to any transferee (other than the Company) only if such holder also simultaneously transfers an equal number of such holder’s Rosehill Operating Common Units to such transferee in compliance with the LLC Agreement. Holders of the Company’s Class B Common Stock will vote together as a single class with holders of the Company’s Class A Common Stock on all matters properly submitted to a vote of the stockholders. Holders of Class B Common Stock generally have the right to cause the Company to redeem all or a portion of their Rosehill Operating Common Units in exchange for shares of the Company’s Class A Common Stock on a one-to-one basis or, at the Company’s option, an equivalent amount of cash. The Company may, however, at its option, affect a direct exchange of cash or Class A Common Stock for such Rosehill Operating Common Units in lieu of such a redemption. Upon the future redemption or exchange of Rosehill Operating Common Units, a corresponding number of shares of Class B Common Stock will be canceled. In the Transaction, the Company issued to Rosehill Operating 29,807,692 shares of its Class B Common Stock and 4,000,000 warrants exercisable for shares of its Class A Common Stock in exchange for 4,000,000 warrants exercisable for Rosehill Operating Common Units. Rosehill Operating immediately distributed the warrants and shares of Class B Common Stock to Tema. Class F Common Stock. Upon the completion of the Transaction in April 2017, all of the outstanding Class F Common Stock (the “Founder Shares”) were automatically converted into 3,475,665 shares of Class A Common Stock in connection with the Transaction. As used herein, unless the context otherwise requires, the Founder Shares are deemed to include the shares of Class A Common Stock issued upon conversion of the Founder Shares and such converted shares continue to be subject to certain transfer restrictions. 8% Series A Cumulative Perpetual Convertible Preferred Stock. Each share of Series A Preferred Stock has a liquidation preference of $1,000 per share and is convertible, at the holder’s option at any time, initially into 86.9565 shares of the Company’s Class A Common Stock (which is equivalent to an initial conversion price of approximately $11.50 per share of Class A Common Stock), subject to specified adjustments and limitations as set forth in the Certificate of Designation of Series A Preferred Stock (the “Certificate of Designation”). Under certain circumstances, the Company will increase the conversion rate upon a “fundamental change” as described in the Certificate of Designation. The Company contributed the net proceeds of $70.8 million from its issuance of 75,000 shares of Series A Preferred Stock and 5,000,000 warrants exercisable for shares of Class A Common Stock to Rosehill Operating. In connection with the issuance of the Series A Preferred Stock, the Sponsor transferred 476,540 shares of its Class A Common Stock to the PIPE Investors to consummate the Transaction. The net proceeds from the issuance of these shares of Series A Preferred Stock and warrants was attributed to the Series A Preferred Stock, warrants and Class A Common Stock contributed by the Sponsor to the PIPE Investors based on the relative fair value of those securities using, among other factors, the closing price of the Class A Common Stock and the closing price of the warrants on April 27, 2017. Rosemore and the Sponsor backstopped redemptions by the public stockholders of the Company once 30% of the outstanding shares of Class A Common Stock were redeemed by purchasing 20,000 shares of Series A Preferred Stock for net proceeds of $20 million pursuant to a side letter entered into between Rosemore, the Sponsor and the Company. The Company contributed to Rosehill Operating the net proceeds from the issuance of 20,000 shares of Series A Preferred Stock to Rosemore Holdings, Inc. and the Sponsor. Upon issuance of the Series A Preferred Stock in April 2017, the nondetachable conversion option embedded in the Series A Preferred Stock was evaluated pursuant to ASC 470-20 and the Company determined that a beneficial conversion feature existed as of the closing date of the Transaction. The beneficial conversion feature was recognized separately from the Series A Preferred Stock in the Company’s consolidated financial statements. The Company recognized in additional paid-in-capital, with an offsetting reduction in the carrying amount of the Series A Preferred Stock, the value of the beneficial conversion feature at the commitment date of $6.7 million . Since the Company’s Series A Preferred Stock is perpetual and has no stated maturity date and no restrictions on conversion, the value attributable to the nondetachable conversion option was recognized immediately as a non-cash deemed dividend on the date that the Series A Preferred Stock was issued. Future issuances of Series A Preferred Stock resulting from dividends paid-in-kind may, depending on the trading price per share of the Company’s Class A Common Stock on the dividend date, contain a beneficial conversion option determined on the same basis as described above and, thus, result in additional non-cash deemed dividends which will reduce net income attributable to Rosehill Resources, Inc. common stockholders when such paid-in-kind shares of Series A Preferred Stock are granted. The Company also ratably recognizes additional non-cash deemed dividends attributable to the Series A Preferred Stock discount which was created by the issuance of the warrants exercisable for shares of Class A Common Stock and the contribution of the Class A Common Stock, as the Series A Preferred Stock which was sold to the PIPE Investors is converted. Also, upon Series A Preferred Stock conversions, non-cash deemed dividends will be recognized and will reduce net income attributable to Rosehill Resources Inc. common stockholders. The Company reflected the following in equity for the Series A Preferred Stock as of December 31, 2018 : December 31, 2018 2017 (In thousands) Liquidation Preference $ 101,669 $ 97,698 Discount (17,038 ) (17,038 ) Series A Preferred Stock $ 84,631 $ 80,660 The table below summarizes the Series A Preferred Stock dividends reflected in the Company’s Consolidated Statements of Operations: Year Ended December 31, 2018 2017 (In thousands) Series A Preferred Stock paid-in-kind $ 3,971 $ 5,530 Series A Preferred Stock paid or payable in cash 3,967 38 Series A Preferred Stock dividends 7,938 5,568 Deemed dividend related to beneficial conversion feature — 6,700 Deemed dividend related to conversion to Class A Common Stock — 668 Series A Preferred Stock dividends and deemed dividends $ 7,938 $ 12,936 For the first quarter, second quarter, third quarter, and fourth quarter of 2018, dividends per share on the Company’s Series A Preferred Stock was $19.73 , $19.95 , $20.16 and $20.16 , respectively. For each quarter in 2018, the dividends on the Company’s Series A Preferred Stock were paid 50% in cash and 50% paid-in-kind. Warrants. Each of the Company’s warrants entitles the registered holder to purchase one share of the Company’s Class A Common Stock at a price of $11.50 per share, subject to adjustment pursuant to the terms of the warrant agreement. The warrants have a five-year term which commenced on April 27, 2017, upon the completion of the Transaction, and will expire on April 27, 2022. The Company may call the warrants for redemption if the reported last sale price of the Class A Common Stock equals or exceeds $21.00 per share for any 20 trading days within a 30 -trading day period ending on the third trading day prior to the date the Company sends the notice of redemption to the warrant holders. There were 588,276 warrants issued in connection with the formation of the Company and 7,597,044 public warrants (the “Public Warrants”) issued in connection with KLRE’s initial public offering. Additionally, there were 8,408,838 warrants issued to the Sponsor and EarlyBirdCapital Inc. pursuant to a private placement (the “Private Placement Warrants”) in connection with the Company’s initial public offering. The Private Placement Warrants are not redeemable by the Company and are exercisable on a cashless basis so long as they are held by the initial holders or their permitted transferees. Otherwise, the Private Placement Warrants have terms and provisions that are identical to those of the warrants described above. If the Private Placement Warrants are held by holders other than the initial holders or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by the holders on the same basis as the warrants described above. In connection with the closing of the Transaction, the Company issued 5,000,000 warrants to the PIPE Investors and 4,000,000 warrants to Tema. These warrants were issued on the same terms, and are subject to the same rights and obligations, as described above. As of December 31, 2018 , there were 25,594,158 warrants exercisable for shares of Class A Common Stock outstanding at a price of $11.50 . All warrants expire on April 27, 2022. Noncontrolling Interest. Noncontrolling interest represents the membership interest held by holders other than the Company. On April 27, 2017, upon the closing of the Transaction, the noncontrolling interest in Rosehill Operating, held by Tema, was approximately 83.6% . The Company has consolidated the financial position and results of operations of Rosehill Operating and reflected the proportionate interest held by Tema as a noncontrolling interest. The noncontrolling interest will change when shares of Series A Preferred Stock are converted into shares of Class A Common Stock, when shares of Class A Common Stock are issued in connection with the Company’s Long-Term Incentive Compensation plan and when Tema elects to exchange the Class B Common Stock received in connection with the transaction for shares of Class A Common Stock. At December 31, 2018 , Tema held an approximate 68.4% noncontrolling interest in Rosehill Operating.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Long-Term Incentive Plan On May 22, 2018 at the Company’s annual meeting of stockholders, the stockholders of the Company approved an amendment and restatement of the Rosehill Resources Inc. Long-Term Incentive Plan (as amended and restated, the “LTIP”). The purpose of the amendment and restatement was to revise the definition of “Change in Control” included in the LTIP and to remove certain tax provisions that are no longer applicable following the repeal of the “qualified performance-based compensation” exception to the Section 162(m) deduction limitation by the Tax Act. The LTIP permits the grant of a number of different types of equity, equity-based and cash awards to employees, directors and consultants, including grant options, SARs, restricted stock, restricted stock units, stock awards, dividend equivalents, other stock-based awards, substitute awards, performance awards, or any combination of the foregoing, as determined by the Compensation Committee of the Board (the “Compensation Committee”), in its sole discretion. The purpose of the LTIP is to provide a means to attract and retain qualified service providers by affording such individuals a means to acquire and maintain stock ownership or awards, the value of which is tied to the performance of the Company. The LTIP also provides additional incentives and reward opportunities designed to strengthen such individuals’ concern for the welfare of the Company and their desire to remain in its employ. At the plan’s inception, 7,500,000 shares of Class A Common Stock were reserved for issuance under the LTIP. As of December 31, 2018 , the Company has granted restricted stock, restricted stock units and performance share units under the LTIP. Stock-based compensation expense for restricted stock and restricted stock units is recognized on a straight-line basis over the requisite service period for each separately vesting tranche of the award as if the award was, in substance, multiple awards. Stock-based compensation is included in general and administrative expense on the Company’s Consolidated Statement of Operations and forfeitures are recognized as they occur. The stock-based compensation expense recognized was $6.5 million , $1.2 million and zero for the years ended December 31, 2018 , 2017 and 2016, respectively. As of December 31, 2018 , 5,757,254 shares of Class A Common Stock remained available for issuance under the LTIP, subject to adjustment pursuant to the plan. Restricted Stock Restricted stock granted under the LTIP is issued on the grant date, but is restricted as to transferability until vesting. These restricted shares generally vest on the first anniversary of the date of grant. The following table sets forth the restricted stock transactions for the year ended December 31, 2018 : Restricted Stock Weighted-Average Grant Date Fair Value Outstanding - December 31, 2017 105,666 $ 7.95 Granted 246,653 6.24 Vested (105,666 ) 7.95 Forfeited — — Outstanding - December 31, 2018 246,653 $ 6.24 As of December 31, 2018 , there was $0.9 million of unrecognized compensation cost related to nonvested restricted stock which is expected to be recognized over a weighted-average period of 0.7 years. Stock-Settled Time-Based Restricted Stock Units Stock-settled time-based restricted stock units entitle the holder to receive one share of Class A Common Stock for each restricted stock unit when such restricted stock unit vests. These stock-settled time-based restricted stock units generally vest in three substantially equal installments on the first three anniversaries of the date of grant. The following table sets forth stock-settled time-based restricted stock unit transactions for the year ended December 31, 2018 : Restricted Stock Units Weighted-Average Grant Date Fair Value Nonvested - December 31, 2017 713,939 $ 9.88 Granted 549,150 6.62 Vested (347,512 ) 9.44 Forfeited (202,019 ) 7.96 Nonvested - December 31, 2018 713,558 $ 8.13 As of December 31, 2018 , there was $4.0 million of unrecognized compensation cost related to nonvested stock-settled time-based restricted stock units which is expected to be recognized over a weighted-average period of 1.7 years. Market Based Performance Share Units On March 26, 2018, the Company granted a target number of 432,973 market based performance share units at a fair value of $8.99 per share to certain employees. The market based performance share units cliff vest on December 31, 2020 and will be settled in stock, provided that certain performance criteria are met. The performance criteria applicable to such awards is relative total shareholder return, which measures the Company’s total shareholder return as compared to the total shareholder return of the peer group identified by the Compensation Committee. The Company recognizes compensation expense for the performance share units subject to market conditions regardless of whether it becomes probable that these conditions will be achieved or not and compensation expense is not reversed if vesting does not actually occur. The following table sets forth market based performance share unit transactions for the year ended December 31, 2018 : Performance Restricted Stock Units Weighted-Average Grant Date Fair Value Nonvested - December 31, 2017 — $ — Granted 432,973 8.99 Vested (46,649 ) 8.99 Forfeited (101,909 ) 8.99 Nonvested - December 31, 2018 284,415 $ 8.99 The grant-date fair value was estimated using a Monte Carlo valuation model. The Monte Carlo valuation model is based on random projections of stock price paths and must be repeated numerous times to achieve a probabilistic assessment. Expected volatility was calculated based on the historical volatility of the Class A Common Stock, and the risk-free interest rate is based on U.S. Treasury yield curve rates with maturities consistent with the three-year vesting period. The following assumptions were used to value the market based performance awards: Expected volatility 89.5 % Risk-free interest rate 2.4 % Dividend yield — % Expected life (years) 2.77 As of December 31, 2018 , there was $1.8 million of unrecognized compensation cost related to shares of market based performance restricted stock units which is expected to be recognized over a weighted average period of 2.0 years. Cash-Settled Restricted Stock Units During the year ended December 31, 2018 , the Company granted 98,743 cash-settled restricted stock units to certain employees. Cash-settled restricted stock units entitle the holder to receive the cash equivalent of one share of Class A Common Stock for each restricted stock unit when such restricted stock unit vests. These cash-settled restricted stock units generally vest in three substantially equal installments on the first three anniversaries of the date of grant. Cash-settled restricted stock units are classified as liabilities and are remeasured at each reporting date until settled. The stock-based compensation expense for cash-settled restricted stock units is recognized on a straight-line basis over the requisite service period for each separately vesting tranche of the award as if the award was, in substance, multiple awards. The following table sets forth cash-settled restricted stock unit transactions for the year ended December 31, 2018 : Cash-Settled Restricted Stock Units Weighted-Average Grant Date Fair Value Nonvested - December 31, 2017 — $ — Granted 98,743 6.62 Vested — — Forfeited (20,519 ) 6.60 Nonvested - December 31, 2018 78,224 $ 6.63 As of December 31, 2018 , the Company had a liability for cash-settled restricted stock units of less than $0.1 million based on a closing price of $2.23 on December 31, 2018 . As of December 31, 2018 , there was $0.1 million of unrecognized compensation cost related to shares of cash-settled restricted stock units which is expected to be recognized over a weighted average period of 2.2 years. Retirement Benefits The Company has not maintained, and does not currently maintain, a defined benefit pension plan or nonqualified deferred compensation plan. The Company currently maintains a retirement plan pursuant to which employees are permitted to contribute portions of their base compensation to a tax-qualified retirement account. The Company provides matching contributions equal to 100% of elective deferrals up to 3% of eligible compensation and 50% of elective deferrals from 3% to a maximum of 5% of eligible compensation, subject to the applicable contributions limits. Beginning on January 1, 2019, the Company changed its matching contributions to 100% of elective deferrals up to 6% of eligible compensation. Matching contributions are immediately fully vested. The Company’s matching contributions under the plan totaled $0.3 million , $0.1 million and $0.1 million for the years ended December 31, 2018 , 2017 and 2016, respectively.

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Transactions with Related Parties	Transactions with Related Parties The Company is not entitled to compensation for its services as managing member of Rosehill Operating. The Company is entitled to reimbursement by Rosehill Operating for any costs, fees or expenses incurred on behalf of Rosehill Operating (including costs of securities offerings not borne directly by members, board of directors’ compensation and meeting costs, cost of periodic reports to its stockholders, litigation costs and damages arising from litigation, accounting and legal costs); provided that the Company will not be reimbursed for any of its income tax obligations. Rosemore. Rosemore provided employee benefits and other administrative services to Rosehill Operating. During the years ended December 31, 2017 and 2016, Rosemore incurred and Tema billed to Rosehill Operating approximately $9.6 million and $6.0 million , respectively, related to these services. Amounts incurred for employee benefits and other administrative services provided to Rosehill Operating by Rosemore prior to the Transaction were allocated to the Consolidated Statements of Operations as part of the carve-out financial statements – see “Cost Allocations” below. The costs incurred by Rosemore subsequent to the Transaction were billed to Rosehill Operating via the Transition Services Agreement (discussed under Transaction Service Agreement below) between Rosehill Operating and Tema. Rosemore did not provide these services to Rosehill Operating during the year ended December 31, 2018 . Transition Service Agreement . On April 27, 2017 in connection with the closing of the Transaction, the Company entered into a Transition Service Agreement (“TSA”) with Tema to provide certain services to each other following the closing of the Transaction. Pursuant to the terms, the Company agreed to provide to Tema (i) operation services for the assets excluded from the Transaction, (ii) divestment assistance and (iii) office space to Gateway and Marketing (“Gateway”). Tema agreed to provide to the Company (i) human resources and benefits administration, (ii) information technology and telecommunications, (iii) general business insurance and (iv) legal services. The TSA terminated on October 27, 2018. Rosehill Operating did not incur significant costs related to providing services to Tema under the TSA for the year ended December 31, 2018 . During the year ended December 31, 2017 , the Company incurred and billed costs of $0.8 million related to services provided to Tema under the TSA. The amounts due from Tema at December 31, 2017 were less than $0.1 million . Gateway Gathering and Marketing (“Gateway”) . Gateway is a subsidiary of Rosemore. A portion of Rosehill Operating’s oil production is sold to Gateway. For the years ended December 31, 2018 , 2017 and 2016, revenues from production sold to Gateway were approximately $181.2 million , $61.3 million and $24.4 million , respectively. As of December 31, 2018 , there was no revenue receivable due from Gateway. As of December 31, 2017 , the revenue receivable due from Gateway was approximately $13.6 million . Rosehill Operating has a Crude Oil Gathering Agreement and a Gas Gathering Agreement with Gateway for a portion of its production. The majority of the costs incurred under the Crude Oil Gathering Agreement were netted against the revenues received from Gateway due to Gateway being the purchaser of the oil production. Costs incurred for the year ended December 31, 2018 under the Crude Oil Gathering Agreement that was not netted against the revenues received from Gateway were $0.6 million , of which $0.3 million was payable due to Gateway as of December 31, 2018 . Costs incurred under the Gas Gathering Agreement with Gateway for the years ended December 31, 2018 , 2017 and 2016, were approximately $3.3 million , $1.1 million and $1.4 million , respectively. As of December 31, 2018 , there was no payable due to Gateway related to the Gas Gathering Agreement. As of December 31, 2017 , there was $0.2 million payable due to Gateway related to the Gas Gathering Agreement. In 2018, Rosehill Operating entered into a Crude Oil Marketing Consulting Agreement with Gateway to, among other things, develop marketing strategies aimed at increasing realized prices from the sale of Rosehill Operating’s production. Costs incurred in 2018 under the Crude Oil Marketing Consulting Agreement were $0.1 million , all of which was included in Accrued liabilities and other at December 31, 2018. Certain consulting services were provided to Gateway. For the years ended December 31, 2017 and 2016, Gateway was invoiced amounts less than $0.1 million related to these services, which were recorded in general and administrative expenses in the accompanying Consolidated Statements of Operations. Certain other general and administrative services were also provided to Gateway, for which Gateway was invoiced approximately $0.1 million and $0.3 million for the years ended December 31, 2017 and December 31, 2016, respectively. As of December 31, 2017 and 2016, the receivable due from Gateway related to these services was less than $0.1 million and approximately $0.3 million , respectively. Transaction expenses . Under the terms of the Transaction, the Company reimbursed Tema and Rosemore $1.6 million and $2.4 million , respectively, on April 27, 2017, for costs incurred in connection with the Transaction. Distributions. The LLC Agreement requires Rosehill Operating to make a corresponding cash distribution to the Company at any time a dividend is to be paid by the Company to the holders of its Series A Preferred Stock and Series B Preferred Stock. The LLC Agreement allows for distributions to be made by Rosehill Operating to its members on a pro rata basis in accordance with the number of Rosehill Operating Common Units owned by each member out of funds legally available therefor. The Company expects Rosehill Operating may make distributions out of distributable cash periodically to the extent permitted by the Amended and Restated Credit Agreement and necessary to enable the Company to cover its operating expenses and other obligations, as well as to make dividend payments, if any, to the holders of its Class A Common Stock. In addition, the LLC Agreement generally requires Rosehill Operating to make (i) pro rata distributions (in accordance with the number of Rosehill Operating Common Units owned by each member) to its members, including the Company, in an amount at least sufficient to allow the Company to pay its taxes and satisfy its obligations under the Tax Receivable Agreement and (ii) tax advances, which will be repaid upon a redemption, in an amount sufficient to allow each of the members of Rosehill Operating to pay its respective taxes on such holder’s allocable share of Rosehill Operating’s taxable income after taking into account certain other distributions or payments received by the unitholder from Rosehill Operating or the Company. Cost Allocations . For periods prior to the Transaction, Tema allocated certain overhead costs associated with general and administrative services, including insurance, professional fees, facilities, information services, human resources and other support departments related to Rosehill Operating. Also included in the cost allocations are costs associated with employees covered under Rosemore’s defined benefit plan and long-term incentive compensation plan. Employees of Rosehill Operating no longer participate in either employee benefit plan. Overhead costs allocated were $1.5 million and $6.0 million for the year ended December 31, 2017 and 2016, respectively. There were no overhead costs allocated subsequent to the Transaction. Where costs incurred related to Rosehill Operating’s assets in the periods prior to the Transaction could not be determined by specific identification, the costs were primarily allocated proportionately on a Boe basis. Management believes the allocations are a reasonable reflection of the utilization of services provided. However, the allocations may not fully reflect the expense that would have been incurred had Rosehill Operating’s assets been a stand-alone company during the 2017 and 2016 periods presented. The Transaction Purchase Price Settlement. The working capital adjustment in the Transaction was originally estimated to be $5.6 million and was contributed to Rosehill Operating by the Company upon closing the Transaction. The final working capital adjustment of $2.4 million due to the Company from Tema was reflected as a reduction to the preliminary purchase price as of December 31, 2017 and received by the Company in 2018. KLR Sponsor. In October 2018, Rosehill Operating entered into a Water Purchase Agreement with Seawolf Water Resources, LP (“Seawolf”), an affiliate of KLR Sponsor, to purchase water from Seawolf’s water wells for use in well completion operations. For the year ended December 31, 2018, Rosehill Operating incurred costs of $1.2 million , of which approximately $0.6 million was included in Accrued capital expenditures at December 31, 2018, related to the purchase of water from Seawolf’s water wells. In September 2017, the Company entered into an advisory agreement with KLR Group (the “Advisory Agreement”), an affiliate of KLR Sponsor, to pay a cash fee in an amount equal to 2.5% of the aggregate funds committed to finance the White Wolf Acquisition. The Company received a commitment of $200 million under the Series B Preferred Stock Agreement and $100 million under the Second Lien Notes to fund the White Wolf Acquisition. The Company paid an advisory fee of $7.5 million to KLR Group.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Leases and Other Commitments The following is a schedule of the Company’s future minimum lease payments with commitments that have initial or remaining lease terms in excess of one year as of December 31, 2018: 2019 2020 2021 2022 2023 Thereafter Total (In thousands) Operating lease obligations $ 1,213 $ 1,202 $ 1,097 $ 557 $ — $ — $ 4,069 Capital lease obligations 34 3 — — — — 37 Drilling commitments 6,525 — — — — — 6,525 Minimum volume commitment 1,692 1,692 1,526 380 — — 5,290 Total $ 9,464 $ 2,897 $ 2,623 $ 937 $ — $ — $ 15,921 Operating lease obligations. The Company leases office space in Houston, Texas and Midland, Texas. The Company recognized rent expense of $1.2 million , $1.0 million and $0.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. The Company recognizes rent expense on a straight-line basis over the noncancelable lease term. The leases for office space in Houston, Texas and Midland, Texas expire in June 2022 and December 2020, respectively. Capital lease obligations. The Company leases printers, scanners, and copiers for its office space. The Company’s final payment on the leases will be in January 2020. Rights of Securities Holders . The holders of the Founder Shares, the Series A Preferred Stock, the Private Placement Warrants and unregistered Class A Common Stock are entitled to registration rights pursuant to certain agreements of the Company. In May 2017, the Company filed a registration statement registering the Founder Shares, the Series A Preferred Stock (and any shares of Class A Common Stock issuable upon conversion of the Series A Preferred Stock), the Private Placement Warrants (and any shares of Class A Common Stock issuable upon the exercise of the Private Placement Warrants), the unregistered Class A Common Stock and the shares of Class A Common Stock issuable upon exercise of the outstanding Public Warrants. The registration statement has been effective since June 19, 2017. Rosehill Operating Common Unit Redemption Right. The LLC Agreement provides Tema with a redemption right, which entitles Tema to cause Rosehill Operating to redeem, from time to time, all or a portion of its Rosehill Operating Common Units (and a corresponding number of shares of Class B Common Stock) for, at Rosehill Operating’s option, newly issued shares of Class A Common Stock on a one-for-one basis or a cash payment equal to the average of the volume-weighted closing price of one share of Class A Common Stock for the twenty trading days prior to the date Tema delivers a notice of redemption for each Rosehill Operating Common Units redeemed (subject to customary adjustments, including for stock splits, stock dividends and reclassifications). In the event of a reclassification event (as defined in the LLC Agreement), the Company as managing member is required to ensure that each Rosehill Operating Common Unit (and a corresponding share of Class B Common Stock) is redeemable for the same amount and type of property, securities or cash that a share of Class A Common Stock becomes exchangeable for or converted into as a result of such reclassification event. Upon the exercise of the redemption right, Tema will surrender its Rosehill Operating Common Units (and a corresponding number of shares of Class B Common Stock) to Rosehill Operating and (i) Rosehill Operating shall cancel such Rosehill Operating Common Units and issue to the Company a number of Rosehill Operating Common Units equal to the number of surrendered Rosehill Operating Common Units and (ii) the Company shall cancel the surrendered shares of Class B Common Stock. The LLC Agreement requires that the Company contribute cash or shares of Class A Common Stock to Rosehill Operating in exchange for the issuance to the Company described in clause (i). Rosehill Operating will then distribute such cash or shares of Class A Common Stock to Tema to complete the redemption. Upon the exercise of the redemption right, the Company may, at its option, affect a direct exchange of cash or its Class A Common Stock for such Rosehill Operating Common Units in lieu of such a redemption. Maintenance of One-to-One Ratios. The LLC Agreement includes provisions intended to ensure that the Company at all times maintains a one-to-one ratio between (a) (i) the number of outstanding shares of Class A Common Stock and (ii) the number of Rosehill Operating Common Units owned by the Company (subject to certain exceptions for certain rights to purchase equity securities of the Company under a “poison pill” or similar shareholder rights plan, if any, certain convertible or exchangeable securities issued under the Company’s equity compensation plans and certain equity securities issued pursuant to the Company’s equity compensation plans (other than a stock option plan) that are restricted or have not vested thereunder) and (b) (i) the number of other outstanding equity securities of the Company (including the Series A Preferred Stock and the warrants exercisable for shares of Class A Common Stock) and (ii) the number of corresponding outstanding equity securities of Rosehill Operating. These provisions are intended to result in Tema having a voting interest in the Company that is identical to Tema’s economic interest in Rosehill Operating. Contingencies Legal . In the ordinary course of business, the Company is party to various legal actions, which arise primarily from its activities as operator of oil and natural gas wells. In management’s opinion, the outcome of any such currently pending legal actions will not have a material adverse effect on the Company’s financial position or results of operation. There is no material litigation, arbitration or governmental proceeding currently pending against the Company or any members of its management team in their capacity as such. Environmental Matters . Environmental assessments and remediation efforts are conducted at multiple locations, primarily previously owned or operated facilities. Environmental and clean-up costs are accrued when it is both probable that a liability has been incurred and the amount can be reasonably estimated. Accruals for losses from environmental remediation obligations generally are recorded no later than completion of the remediation feasibility study. Estimated costs, which are based upon experience and assessments, are recorded at undiscounted amounts without considering the impact of inflation and are adjusted periodically as additional or new information is available. Environmental assessments and remediation costs for the years ended December 31, 2018 , 2017 and 2016 did not have a material adverse effect on the financial condition, results of operations and cash flows.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies and Recently Issued Accounting Standards (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial results of the Company consist of the financial results of Rosehill and Rosehill Operating, its consolidated subsidiary. Pursuant to the Transaction described above, the Company acquired approximately 16.4% of the Rosehill Operating Common Units, while Tema retained approximately 83.6% of the Rosehill Operating Common Units. As of December 31, 2018 , the Company owns approximately 31.6% of the Rosehill Operating Common Units and Tema owns approximately 68.4% of the Rosehill Operating Common Units. The Transaction was accounted for as a reverse recapitalization. As a result, the reports filed by the Company subsequent to the Transaction are prepared “as if” Rosehill Operating is the predecessor and legal successor to the Company. The historical operations of Rosehill Operating are deemed to be those of the Company. Thus, the financial statements included in this report reflect (i) the historical operating results of Rosehill Operating prior to the Transaction; (ii) the combined results of the Company and Rosehill Operating following the Transaction; (iii) the assets and liabilities of Rosehill Operating at their historical cost; and (iv) the Company’s equity and earnings per share for all periods presented. All periods prior to the date of the Transaction shown in the accompanying consolidated financial statements have been prepared on a “carve-out” basis and are derived from the accounting records of Tema. The accompanying consolidated financial statements prior to the Transaction include direct expenses related to Rosehill Operating and expense allocations for certain functions of Tema including, but not limited to, general corporate expenses related to finance, legal, information technology, human resources, communications, insurance, utilities and compensation. These expenses have been allocated on the basis of direct usage when identifiable, actual volumes and revenues, with the remainder allocated proportionately on a barrel of oil equivalent (“Boe”) basis. Management considers the basis on which the expenses have been allocated to reasonably reflect the utilization of services provided to or the benefit received by Rosehill Operating during the periods presented. The allocations may not, however, reflect the expenses that would have been incurred as an independent company for the periods presented. Actual costs that may have been incurred prior to the Transaction would depend on a number of factors, including the organizational structure, whether functions were outsourced or performed by employees and strategic decisions made in areas such as information technology and infrastructure. The allocations and related estimates and assumptions are described more fully in Note 15 - Transactions with Related Parties. The consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”). All intercompany balances and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current presentation on the accompanying consolidated financial statements. Such reclassifications had no impact on net income, cash flows or shareholders’ equity previously reported.
Variable Interest Entities	Variable Interest Entities Rosehill Operating is a variable interest entity. The Company determined that it is the primary beneficiary of Rosehill Operating as the Company is the sole managing member and has the power to direct the activities most significant to Rosehill Operating’s economic performance as well as the obligation to absorb losses and receive benefits that are potentially significant. The Company consolidated 100% of Rosehill Operating’s assets and liabilities and results of operations in the Company’s consolidated financial statements. Although Tema had a larger ownership interest in Rosehill Operating, because it has disproportionately fewer voting rights, Tema is shown as a noncontrolling interest holder of Rosehill Operating.
Use of Estimates	Use of Estimates The preparation of the Company’s consolidated financial statements requires the Company’s management to make various assumptions, judgments and estimates to determine the reported amounts of assets, liabilities, revenues, expenses and in the disclosures of commitments and contingencies. Changes in these assumptions, judgments, and estimates will occur as a result of the passage of time and the occurrence of future events and, accordingly, actual results could differ from amounts previously reported. The more significant areas requiring the use of assumptions, judgments and estimates include: • the quantities and values of proved oil, natural gas and natural gas liquids (“NGLs”) reserves used in calculating depletion and assessing impairment of oil and natural gas properties and related present value estimates of future net cash flows therefrom, • the carrying value of oil and natural gas properties, • impairment of oil and natural gas properties, • asset retirement obligations, • oil and natural gas reserve quantities, • the fair value of commodity derivative instruments and positions, • fair value of the Company’s warrants, • estimates of the fair value of equity-based compensation, • estimates of current and deferred income taxes and • deferred income tax valuation allowances and amounts associated with the Company’s Tax Receivable Agreement with Tema (the “Tax Receivable Agreement”) (see Note 12 – Income Taxes) . While management believes these estimates are reasonable, changes in facts and assumptions, or the discovery of new information may result in revised estimates. Actual results could differ from these estimates and it is reasonably possible these estimates could be revised in the near term, and these revisions could be material.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all cash on hand, and highly liquid instruments with an original maturity of three months or less to be cash and cash equivalents. The Company’s cash and cash equivalents are held in financial institutions in amounts that may exceed the insurance limits of the Federal Deposit Insurance Corporation, however, management believes the Company’s counter-party risks are minimal based on the reputation and history of the institutions selected.
Accounts Receivable	Accounts Receivable Accounts receivable consist of receivables from joint interest owners on properties the Company operates and from sales of oil and natural gas production delivered to purchasers. The purchasers remit payment for production directly to the Company. Most payments are received within three months after the production date. Accounts receivable are not collateralized. Amounts due from joint interest owners or purchasers are stated net of an allowance for doubtful accounts when the Company believes collection is doubtful. For receivables from joint interest owners, the Company typically has the ability to withhold future revenue disbursements to recover any non-payment of joint interest billings. Accounts receivable outstanding longer than the contractual payment terms are considered past due. The Company determines its allowance by considering a number of factors, including the length of time accounts receivable are past due, the Company’s previous loss history, the debtor’s current ability to pay its obligation to the Company, the condition of the general economy and the industry as a whole. The Company writes off specific accounts receivable when they become uncollectible, and payments subsequently received on such receivables are credited to the allowance for doubtful accounts. No allowance was deemed necessary at December 31, 2018 or December 31, 2017. See details of the Company’s accounts receivable balance in Note 4 - Accounts Receivable .
Revenue Recognition	Revenue Recognition The Company derives its revenue primarily from the sale of produced oil, natural gas, and NGLs. Revenue is recognized when the Company’s production is delivered to the purchaser, but payment is generally received between 30 and 90 days after the date of production. No revenue is recognized unless it is determined that title to the product has transferred to a purchaser. At the end of each month, the Company make estimates of the amount of production delivered to the purchaser and the price it will receive. The Company uses its knowledge of its properties, contractual arrangements, NYMEX and local spot market prices, and other factors as the basis for these estimates. Variances between the estimates and the actual amounts received are recorded in the month payment is received. Transportation expenses for oil are included as a reduction to oil revenues, while gathering and transportation expenses for natural gas and NGLs are recorded within gathering and transportation. See Recently Issued Accounting Standards Not Yet Adopted within Note 2 for an update on the impact of ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASC 606”) , on how the Company will recognize revenue in 2019 and beyond.
Successful Efforts Method of Accounting for Oil and Natural Gas Activities	Successful Efforts Method of Accounting for Oil and Natural Gas Activities Oil and natural gas exploration, development and production activities are accounted for under the successful efforts method of accounting. Under this method, the costs incurred to acquire, drill and complete productive wells and development wells are capitalized. Oil and gas lease acquisition costs are also capitalized. Proved Oil and Natural Gas Properties . If proved reserves are found for these properties, costs incurred to obtain access to proved reserves and to provide facilities for extracting, treating, gathering and storing oil, natural gas and NGLs are capitalized. All costs incurred to drill and equip successful exploratory wells, development wells, development-type stratigraphic test wells and service wells, including unsuccessful development wells, are capitalized. Capitalized costs attributed to the properties and mineral interests are subject to depreciation, depletion and amortization (“DD&A”). Depletion of capitalized costs is provided using the units-of-production method based on proved oil and gas reserves related to the associated reservoir. If no proved reserves have been found, the costs of each of the related exploratory wells are charged to expense. Unproved Properties . Acquisition costs associated with the acquisition of non-producing leaseholds are recorded as unproved leasehold costs and capitalized as incurred. These consist of costs incurred in obtaining a mineral interest or right in a property, such as a lease in addition to options to lease, broker fees, recording fees and other similar costs related to acquiring properties. Leasehold costs are classified as unproved until proved reserves are discovered, at which time related costs are transferred to proved oil and natural gas properties. Exploration Costs . Exploration costs, other than exploration drilling costs, are charged to expense as incurred. These costs include personnel and other internal costs, geological and geophysical expenses, exploratory dry holes, delay rentals for leases and cost associated with unsuccessful lease acquisitions. The costs of drilling exploratory wells and exploratory-type stratigraphic wells are initially capitalized pending determination of whether the well has discovered proved commercial reserves. If the exploratory well is determined to be unsuccessful, the cost of the well is transferred to expense. In some cases, a determination of proved reserves cannot be made at the completion of drilling, requiring additional testing and evaluation of the wells. The costs of such exploratory wells are expensed if a determination of proved reserves has not been made within a 12-month period after drilling is complete. For sales of a complete or partial unit of proved and unproved properties and related facilities, the cost and related accumulated DD&A are removed from the property accounts and gain or loss is recognized for the difference between the proceeds received and the net carrying value of the properties sold. Impairment of Oil and Natural Gas Properties The Company’s proved oil and natural gas properties are recorded at cost. The Company’s proved properties are evaluated for impairment on a field-by-field basis whenever events or changes in circumstances indicate that an asset’s carrying value may not be recoverable. The Company compares expected undiscounted future cash flows to the net book value of the asset. If the future undiscounted expected cash flows, based on its estimate of future oil and natural gas prices, operating costs and anticipated production from proved reserves and risk-adjusted probable and possible reserves, are lower than the net book value of the asset, the capitalized cost is reduced to fair value. Commodity pricing is estimated by using WTI and Henry Hub natural gas NYMEX strip market pricing, adjusted for quality, transportation fees and a regional price differential. Fair value is calculated by discounting the future cash flows at a rate of 10% . The Company believes a 10% discount rate is commonly used by oil and gas industry peers, analysts and investors in evaluating the monetary significance of oil and gas properties and for comparing the size and value of proved reserves among companies in our industry. Accordingly, the Company currently believes a 10% discount rate is consistent with a rate a market participant would consider in evaluating onshore domestic proved oil and gas reserves and produces a reasonable estimate of fair value. Unproved oil and natural gas properties are assessed periodically, and no less than annually, for impairment on an aggregate basis based on remaining lease term, drilling results, reservoir performance, seismic interpretation and future plans to develop acreage. As unproved oil and natural gas properties are developed and reserves are proved, the capitalized costs are subject to depreciation and depletion. If the development of these properties is deemed unsuccessful, the capitalized costs related to the unsuccessful activity is expensed in the year the determination is made. The rate at which the unproved oil and natural gas properties are written off or reclassified to proved oil and natural gas properties depends on the timing and success of the Company’s future exploration and development program. Oil and Natural Gas Reserve Quantities The Company’s estimated proved reserve quantities and future net cash flows are critical to the understanding of the value of its business. They are used in comparative financial ratios and are the basis for significant accounting estimates in its financial statements, including the calculations of depletion and impairment of proved oil and natural gas properties. Future cash inflows and future production and development costs are determined by applying prices and costs, including transportation, quality differentials and basis differentials, applicable to each period to the estimated quantities of proved reserves remaining to be produced as of the end of that period. Expected cash flows are discounted to present value using an appropriate discount rate. For example, the standardized measure calculations require a 10% discount rate to be applied. Although reserve estimates are inherently imprecise, and estimates of new discoveries and undeveloped locations are more imprecise than those of established producing oil and gas properties, the Company makes a considerable effort in estimating our reserves. The Company expects proved reserve estimates will change as additional information becomes available and as commodity prices and operating and capital costs change. The Company has and expects to evaluate and estimate its proved reserves each year-end. For purposes of depletion and impairment, reserve quantities are adjusted in accordance with U.S. GAAP for the impact of additions and dispositions.
Other Property and Equipment	Other Property and Equipment Other property and equipment such as office furniture and equipment, buildings, computer hardware and software is recorded at cost. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets ranging from three to twenty years. Major renewals and improvements are capitalized while expenditures for maintenance and repairs are expensed as incurred. When other property and equipment is sold or retired, the capitalized costs and related accumulated depreciation are removed from the accounts.
Asset Retirement Obligations	Asset Retirement Obligations An asset retirement obligation (“ARO”) represents the estimated present value of the amount a company will incur to retire a long-lived asset at the end of its productive life, in accordance with applicable state laws. The Company recognizes an estimated liability for future costs primarily associated with the abandonment of its oil and natural gas properties and related assets. The amount of the ARO is determined by calculating the present value of estimated cash flows related to the liability. The retirement obligation is recorded as a liability at its estimated present value at inception (i.e. at the time the well is drilled or acquired and related assets are placed into service) with an offsetting increase in the carrying amount of the related long-lived asset that is included in proved oil and natural gas properties in the accompanying consolidated balance sheets. Periodic accretion of discount of the estimated liability is recorded as an expense in the consolidated statement of operations. The Company depreciates the long-lived asset, including the asset retirement cost, over its useful life, and recognizes expense in connection with the accretion of the discounted liability over the remaining estimated economic lives of the respective oil and natural gas properties. An asset retirement liability is determined using significant assumptions, including current estimates of plugging and abandonment costs, annual inflation of these costs, the productive lives of assets and the Company’s risk-adjusted interest rate. Changes in any of these assumptions can result in significant revisions to the estimated asset retirement obligation. Because of the subjectivity of assumptions, the costs to ultimately retire the Company’s wells may vary significantly from prior estimates. See Note 8 - Asset Retirement Obligations for a further discussion.
Deferred Financing Costs	Deferred Financing Costs Deferred financing costs and discounts related to the Company’s Revolving Credit Facility and its Second Lien Notes are included in other long-term assets and long-term debt, respectively, in the consolidated balance sheets and are stated at cost, net of amortization. The deferred financing costs associated with the Revolving Credit Facility and the Second Lien Notes are amortized to interest expense on a straight-line basis and an effective rate of interest method, respectively, over the borrowing terms. See Note 10 - Long term debt, net for a further discussion.
Commodity Derivative Instruments	Commodity Derivative Instruments The Company utilizes commodity derivative instruments including swaps, collars, basis swaps and other similar agreements to manage its exposure to oil, natural gas and NGL price volatility (i.e., price risk) associated with the forecasted sale of a portion its oil and natural gas production. These commodity derivative instruments are not designated as hedges for accounting purposes. Accordingly, the Company records derivative instruments on the consolidated balance sheets as either an asset or liability measured at fair value and records changes in the fair value of derivatives in current earnings in the consolidated statements of operations as they occur in the period of change. Gains and losses on commodity derivatives and premiums paid for put options are included in cash flows from operating activities. To the extent legal right of offset exists with a counterparty, the Company reports derivative assets and liabilities on a net basis. The Company has exposure to credit risk to the extent the counterparty is unable to satisfy its settlement obligation. The Company actively monitors the creditworthiness of counterparties and assesses the impact, if any, on its derivative position. See Note 5 - Derivative Instruments for a further discussion.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value represents the price that would be received to sell the asset or paid to transfer the liability in an orderly transaction between market participants at the reporting date. The Company’s assets and liabilities that are measured at fair value at each reporting date are classified according to a hierarchy that prioritizes inputs and assumptions underlying the valuation techniques. This fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs and consists of three broad levels: Level 1 : Observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets as of the reporting date. Level 2 : Observable market-based inputs or unobservable inputs that are corroborated by market data. These are inputs other than quoted prices in active markets included in Level 1 that are either directly or indirectly observable as of the reporting date. Level 3 : Unobservable inputs that are not corroborated by market data and may be used with internally developed methodologies that result in management’s best estimate of fair value. Valuation techniques that maximize the use of observable inputs are favored. Assets and liabilities are classified in their entirety based on the lowest priority level of input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the placement of assets and liabilities within the levels of the fair value hierarchy. Reclassifications of fair value between Level 1, Level 2 and Level 3 of the fair value hierarchy, if applicable, are made at the end of each quarter. See Note 6 – Fair Value Measurements for more fair value disclosures.
Income Taxes	Income Taxes The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are calculated by applying existing tax laws and the rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in the year of the enacted rate change. The Company accounts for uncertainty in income taxes using a recognition and measurement threshold for tax positions taken or expected to be taken in a tax return, which are subject to examination by federal and state taxing authorities. The tax benefit from an uncertain tax position is recognized when it is more likely than not that the position will be sustained upon examination by taxing authorities based on technical merits of the position. The amount of the tax benefit recognized is the largest amount of the benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. The effective tax rate and the tax basis of assets and liabilities reflect management’s estimates of the ultimate outcome of various tax uncertainties. The Company recognizes penalties and interest related to uncertain tax positions within the provision (benefit) for income taxes line in the accompanying consolidated statements of operations. Rosehill Operating, the Company’s accounting predecessor, is a limited liability company treated as a partnership for U.S. federal income tax purposes that is not subject to U.S. federal income tax.
Earnings (Loss) Per Share	Earnings (Loss) Per Share The two-class method of computing earnings per share is required for entities that have participating securities. The two-class method is an earnings allocation formula that determines earnings per share for participating securities according to dividends declared (or accumulated) and participation rights in undistributed earnings. Our Class B Common Stock has no economic interest in the earnings of the Company. Basic earnings (loss) per common share is calculated by dividing net income (loss) attributable to common shareholders by the weighted average number of shares of Class A Common Stock outstanding each period. Diluted earnings per share adds to those shares the incremental shares that would have been outstanding assuming exchanges of the Company’s outstanding Class B Common Stock, Series A Preferred Stock and warrants for Class A Common Stock, and the vesting of unvested restricted stock units of Class A Common Stock. An anti-dilutive impact is an increase in earnings per share or a reduction in net loss per share resulting from the conversion, exercise, or contingent issuance of certain securities. The Company uses the “if-converted” method to determine the potential dilutive effect of conversions of its outstanding Class B Common Stock and Series A Preferred Stock, and the treasury stock method to determine the potential dilutive effect of its outstanding warrants exercisable for shares of Class A Common Stock and the vesting of unvested restricted stock units of Class A Common Stock. See Note 3 - Earnings Per Share for the Company’s earnings (loss) per share calculation.
Accounting Standards Adopted in 2018 and Recently Issued Accounting Standards Not Yet Adopted	Accounting Standards Adopted in 2018 Equity-based Compensation. In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-09 – Compensation – Stock Compensation (Topic 718); Scope of Modification Accounting. The new guidance clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award as equity or liability changes as a result of the change in terms or conditions. The Company adopted ASU 2017-09 in 2018. The adoption of ASU 2017-09 did not have a material impact on the Company’s consolidated financial statements for the year ended December 31, 2018. Recently Issued Accounting Standards Not Yet Adopted Revenue Recognition. ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASC 606”), supersedes the revenue recognition requirements in Topic 605, Revenue Recognition , and industry-specific guidance in Subtopic 932-605, Extractive Activities-Oil and Gas-Revenue Recognition and requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients , as clarifying guidance to improve the operability and understandability of the implementation guidance on principal versus agent considerations. ASC 606 became effective for the Company on January 1, 2019, and the Company has elected to adopt it using the modified retrospective method. The Company has substantially completed its review of the impact of ASC 606 on its significant contracts and determined that upon adoption of ASC 606, the Company will not be required to record a cumulative effect adjustment due to ASC 606 not having a quantitative impact compared to existing GAAP. While the Company does not expect 2019 net income (loss) or cash flows from operations to be impacted by the implementation of ASC 606, there will be certain changes to the presentation of revenues and related expenses beginning January 1, 2019. Prior to adoption, the Company recorded all gathering and processing fees incurred for natural gas and NGLs in “Gathering and transportation.” Upon adoption of ASC 606, where the Company delivers raw gas to midstream processing companies and retains control of its natural gas and plant products until tailgate of the plant, the cost of such gathering and processing will continue to be reflected in the Company’s “Gathering and transportation” as has been its practice historically. In the case where the Company delivers raw gas to the midstream processing companies and transfer control of its raw natural gas at the inlet to the midstream processing companies, such costs will be reported as a reduction to “Natural gas sales” and “Natural gas liquids sales.” Financial Assets and Financial Liabilities. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . The pronouncement requires, among other things, public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset. For the Company, these changes become effective for fiscal years beginning after December 15, 2018. In February 2018, the FASB issued ASU 2018-03, Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , which clarifies certain aspects of the guidance issued in ASU 2016-01 including: the ability to irrevocably elect to change the measurement approach for equity securities measured using the practical expedient (at cost plus or minus observable transactions less impairment) to a fair value method in accordance with Topic 820, Fair Value Measurement; clarification that if an observable transaction occurs for such securities, the adjustment is as of the observable transaction date; clarification that the prospective transition approach for equity securities without a readily determinable fair value is meant only for instances in which the practical expedient is elected; and various other clarifications. The expected adoption of ASU 2016-01 and ASU 2018-03 are being evaluated by the Company and the adoption is not expected to have a significant impact on the Company’s consolidated financial statements. Leases. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current U.S. GAAP. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842 , which provides clarifying guidance regarding land easements and adds practical expedients. In July 2018, further amendments were issued under ASU 2018-10, Codification Improvements to Topic 842, Leases . In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements , which provides entities with an additional transition method in which an entity initially applies the new leases standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2016-02 and its related updates are effective for the Company for fiscal years beginning after December 15, 2019. The Company is currently evaluating the method of adoption and the impact of the adoption of this guidance on its consolidated financial statements and disclosures. Financial Instruments – Credit Losses. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments requiring the measurement of all expected credit losses for financial assets, which include trade receivables, held at the reporting date based on historical experience, current conditions and reasonable and supportable forecasts. The guidance in this ASU is effective for the Company for fiscal years beginning after December 15, 2020, and interim periods within fiscal years beginning after December 15, 2021 with early adoption permitted for interim and annual periods beginning after December 15, 2018. The evaluation of this standard and its impact on the Company’s consolidated financial statements and related disclosures is currently being assessed. Derivatives and Hedging. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities , which expands and refines hedge accounting for both financial and non-financial risk components, aligns the recognition and presentation of the effects of hedging instruments and hedge items in the financial statements, and includes certain targeted improvements to ease the application of current guidance related to the assessment of hedge effectiveness. ASU 2017-12 is effective for the Company for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements. Fair Value Measurement Disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement , which removes, modifies and adds disclosure requirements on fair value measurements. ASU 2018-13 is effective for the Company for fiscal years beginning after December 15, 2019 and the Company is permitted to early adopt any removed or modified disclosures upon issuance of this ASU and delay adoption of the additional disclosures until their effective date. The Company is currently evaluating the impact of the adoption of this guidance on its disclosures.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies and Recently Issued Accounting Standards (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of Revenue by Major Customers	The table below presents percentages by purchaser that accounted for 10% or more of our total oil, natural gas and NGL sales for each year as presented: Year Ended December 31, 2018 2017 2016 Customer Gateway (1) 60 % 80 % 70 % Plains 17 — — Targa 13 — — ETC Field Services, LLC — 10 17 Enlink Midstream Services, LLC — — 10 Other 10 10 3 Total 100 % 100 % 100 % (1) For a further discussion see Note 15 - Related Party Transactions

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings (Loss) Per Share	The following table sets forth the calculation of basic and diluted weighted average shares outstanding and earnings per share for the indicated periods: Year Ended December 31, 2018 2017 2016 (In thousands, except per share data) Net income (loss) (numerator): Net income (loss) attributable to common stockholders of Rosehill Resources Inc. - basic $ 26,661 $ (8,520 ) $ (15,189 ) Add: Dividends on Series A Preferred Stock 7,938 — — Add: Net income attributable to the noncontrolling interest, net of taxes 47,432 — — Net income (loss) attributable to common stockholders of Rosehill Resources Inc. - diluted $ 82,031 $ (8,520 ) $ (15,189 ) Weighted average shares (denominator): Weighted average shares – basic 8,196 5,945 5,857 Add: Dilutive effects of Series A Preferred Stock 8,495 — — Add: Dilutive effects of Class B Common Stock 29,808 — — Weighted average shares – diluted 46,499 5,945 5,857 Basic income (loss) per share $ 3.25 $ (1.43 ) $ (2.59 ) Diluted income (loss) per share $ 1.76 $ (1.43 ) $ (2.59 )

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Schedule of Accounts Receivable	Accounts receivable is comprised of the following: December 31, 2018 December 31, 2017 Related Parties Third-Parties Related Parties Third-Parties (In thousands) Revenue receivable (1) $ — $ 28,876 $ 13,601 $ 1,153 Realized derivative receivable — 2,229 — — Transaction purchase price settlement — — 2,381 — Joint interest billings — 640 20 83 Other 78 515 20 291 Accounts receivable $ 78 $ 32,260 $ 16,022 $ 1,527 (1) All of the revenue receivable from related parties is attributable to Gateway Gathering and Marketing. For a further discussion see Note 15 - Related Party Transactions

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Assets and Liabilities	The following tables summarize the location and fair value amounts of all the Company’s derivative instruments in the consolidated balance sheets, as well as the gross recognized derivative assets, liabilities and amounts offset in the consolidated balance sheets: December 31, 2018 Gross Fair Value Gross Amounts Offset (1) Net Recognized Fair Value (In thousands) Assets Commodity derivatives - current $ 46,972 $ (16,153 ) $ 30,819 Commodity derivatives - non-current 88,008 (29,694 ) 58,314 Total assets $ 134,980 $ (45,847 ) $ 89,133 Liabilities Commodity derivatives - current $ (16,153 ) $ 16,153 $ — Commodity derivatives - non-current (29,694 ) 29,694 — Series B Preferred Stock bifurcated derivative - non-current (696 ) — (696 ) Total liabilities $ (46,543 ) $ 45,847 $ (696 ) (1) The Company has agreements in place with all of its counterparties that allow for the financial right of offset for derivative assets and liabilities. December 31, 2017 Gross Fair Value Gross Amounts Offset (1) Net Recognized Fair Value (In thousands) Assets Commodity derivatives - current $ 1,079 $ (1,079 ) $ — Commodity derivatives - non-current 120 (120 ) — Total assets $ 1,199 $ (1,199 ) $ — Liabilities Commodity derivatives - current $ (11,851 ) $ 1,079 $ (10,772 ) Commodity derivatives - non-current (7,503 ) 120 (7,383 ) Series B Preferred Stock bifurcated derivative - non-current (625 ) — (625 ) Total liabilities $ (19,979 ) $ 1,199 $ (18,780 ) (1) The Company has agreements in place with all of its counterparties that allow for the financial right of offset for derivative assets and liabilities.
Schedule of Derivative Instruments	As of December 31, 2018 , the open commodity derivative positions with respect to future production were as follows: 2019 2020 2021 2022 Commodity derivative swaps Oil: Notional volume (Bbls) 2,664,000 1,960,000 2,160,000 1,100,000 Weighted average fixed price ($/Bbl) $ 53.59 $ 60.09 $ 61.21 $ 58.42 Natural gas: Notional volume (MMBtu) 2,220,000 1,500,000 1,200,000 1,200,000 Weighted average fixed price ($/MMbtu) $ 2.88 $ 2.84 $ 2.85 $ 2.87 Ethane: Notional volume (Gallons) 12,444,138 — — — Weighted average fixed price ($/Gallons) $ 0.28 $ — $ — $ — Propane: Notional volume (Gallons) 8,296,218 — — — Weighted average fixed price ($/Gallons) $ 0.79 $ — $ — $ — Pentanes: Notional volume (Gallons) 2,765,700 — — — Weighted average fixed price ($/Gallons) $ 1.47 $ — $ — $ — Commodity derivative two-way collars Oil: Notional volume (Bbls) 601,000 — — — Weighted average ceiling price ($/Bbl) $ 61.30 $ — $ — $ — Weighted average floor price ($/Bbl) $ 55.21 $ — $ — $ — Commodity derivative three-way collars Oil: Notional volume (Bbls) 1,531,832 3,294,000 — — Weighted average ceiling price ($/Bbl) $ 68.52 $ 70.29 $ — $ — Weighted average floor price ($/Bbl) $ 57.62 $ 57.50 $ — $ — Weighted average sold put option price ($/Bbl) $ 45.51 $ 47.50 $ — $ — Crude oil basis swaps Midland / Cushing: Notional volume (Bbls) 4,800,832 3,513,600 — — Weighted average fixed price ($/Bbl) $ (4.93 ) $ (1.43 ) $ — $ — Natural gas basis swaps EP Permian: Notional volume (MMBtu) 1,781,472 2,096,160 — — Weighted average fixed price ($/MMBtu) $ (1.03 ) $ (1.03 ) $ — $ —
Schedule of Derivative Instruments in Statement of Financial Position	For the years ended December 31, 2018 and 2017 , the effect of the derivative activity on the Company’s Consolidated Statements of Operations was as follows: Year Ended December 31, 2018 2017 2016 (In thousands) Realized gain (loss) on derivatives Commodity derivative options $ (83 ) $ 172 $ 511 Commodity derivative swaps (15,399 ) 45 (1,334 ) Total (15,482 ) 217 (823 ) Interest rate swap — (143 ) (785 ) Total realized gain (loss) on derivatives $ (15,482 ) $ 74 $ (1,608 ) Unrealized gain (loss) on derivatives Commodity derivative options $ 28,965 $ 313 $ (1,508 ) Commodity derivative swaps 79,121 (16,866 ) (1,838 ) Total 108,086 (16,553 ) (3,346 ) Interest rate swap — (226 ) $ (3,346 ) Series B Preferred Stock bifurcated derivative (71 ) — 324 Total unrealized gain (loss) on derivatives $ 108,015 $ (16,779 ) $ (3,022 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities	The tables below set forth by level within the fair value hierarchy represent the net components of the assets and liabilities that were measured at fair value on a recurring basis as of December 31, 2018 and December 31, 2017 . These net balances are intended solely to provide information on sources of inputs to fair value and proportions of fair value involving objective versus subjective valuations and do not represent either the actual credit exposure or net economic exposure. December 31, 2018 Level 1 Level 2 Level 3 Total (In thousands) Derivative assets Commodity derivative assets - current $ — $ 30,819 $ — $ 30,819 Commodity derivative assets - non-current — 58,314 — 58,314 Total derivative assets $ — $ 89,133 $ — $ 89,133 Derivative liabilities Series B Preferred Stock bifurcated derivative - non-current $ — $ — $ (696 ) $ (696 ) Total derivative liabilities $ — $ — $ (696 ) $ (696 ) December 31, 2017 Level 1 Level 2 Level 3 Total (In thousands) Derivative liabilities Commodity derivative liabilities - current $ — $ (10,772 ) $ — $ (10,772 ) Commodity derivative liabilities - non-current — (7,383 ) — (7,383 ) Series B Preferred Stock bifurcated derivative - non-current — — (625 ) (625 ) Total derivative liabilities $ — $ (18,155 ) $ (625 ) $ (18,780 ) The financial instruments measured at fair value on a recurring basis consist of the following: December 31, December 31, 2018 2017 (In thousands) Derivative assets (liabilities) Derivative assets - current $ 30,819 $ — Derivative assets - non-current 58,314 — Total derivative assets 89,133 — Derivative liabilities - current $ — $ (10,772 ) Derivative liabilities - non-current (696 ) (8,008 ) Total derivative, net $ 88,437 $ (18,780 )
Schedule of Changes in Fair Value of Level 3 Liabilities	The table below sets forth a summary of changes in the fair value of the Company’s level 3 liabilities for the year ended December 31, 2018 . Beginning Balance $ 625 (Gains) losses reported in earnings 71 Ending Balance $ 696

Property and equipment (Tables)

Property and equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment is comprised of the following: December 31, December 31, 2018 2017 (In thousands) Proved oil and natural gas properties $ 777,558 $ 423,611 Unproved oil and natural gas properties 121,929 121,690 Land 1,575 406 Less: accumulated DD&A and impairment (234,265 ) (114,375 ) Total oil and natural gas properties (successful efforts), net 666,797 431,332 Other property and equipment 6,059 4,345 Less: accumulated DD&A (3,467 ) (3,062 ) Total other property and equipment 2,592 1,283 Total property and equipment, net $ 669,389 $ 432,615

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Asset Retirement Obligations	The following table summarized the changes in the Company’s asset retirement obligation for the periods below: Year Ended December 31, 2018 2017 (In thousands) Asset retirement obligations, beginning of year $ 8,630 $ 5,431 Additional liabilities incurred 4,480 5,389 Dispositions — (2,380 ) Accretion expense 638 317 Liabilities settled upon plugging and abandoning wells (441 ) (504 ) Revision of estimates 217 377 Asset retirement obligations, end of year 13,524 8,630 Less: current portion of asset retirement obligations — 108 Long-term asset retirement obligations $ 13,524 $ 8,522

Accrued Liabilities and Other (

Accrued Liabilities and Other (Tables)	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities and Other	Accrued liabilities and other is comprised of the following as of the respective dates: December 31, December 31, 2018 2017 (In thousands) Accrued payroll $ 3,764 $ 2,352 Royalties payable 11,511 3,903 Accrued lease operating expense 3,992 2,230 Contingent liability - White Wolf Acquisition — 4,005 Preferred Stock dividends payable 3,362 937 Accrued interest expense 925 639 Accrued production taxes 1,234 147 Accrued ad valorem taxes 1,066 — Accrued debt issuance costs 631 — Other 850 1,279 Total accrued liabilities and other $ 27,335 $ 15,492

Long-term debt, net (Tables)

Long-term debt, net (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	The Company’s long-term debt is comprised of the following: December 31, December 31, 2018 2017 (In thousands) Second Lien Notes $ 100,000 $ 100,000 Revolving credit facility 194,000 — Total debt 294,000 100,000 Debt issuance cost on Second Lien Notes, net 3,211 3,830 Discount on Second Lien Notes, net 2,491 2,971 Total debt issuance cost and discounts 5,702 6,801 Total long-term debt, net $ 288,298 $ 93,199
Schedule of Maturities of Long-term Debt	The following are maturities of long-term debt for each of the next five years and thereafter (amounts in thousands): 2019 $ — 2020 — 2021 — 2022 194,000 2023 100,000 Total $ 294,000
Schedule of Deferred Financing Costs and Debt Discounts	The following table summarizes the Company’s deferred financing costs and debt discounts: December 31, December 31, 2018 2017 (In thousands) Revolving credit facility Debt issuance costs $ 2,368 $ 1,219 Accumulated amortization of debt issuance costs (361 ) (541 ) Net deferred costs - Revolving credit facility $ 2,007 $ 678 Second Lien Notes Debt discount $ 3,000 $ 3,000 Accumulated amortization of debt discount (509 ) (29 ) Debt issuance costs 3,868 3,868 Accumulated amortization of debt issuance costs (657 ) (38 ) Net deferred costs - Second Lien Notes $ 5,702 $ 6,801 Total deferred financing costs and debt discount, net $ 7,709 $ 7,479

10% Series B Redeemable Prefe_2

10% Series B Redeemable Preferred Stock (Tables)	12 Months Ended
	Dec. 31, 2018
Temporary Equity Disclosure [Abstract]
Schedule of Mezzanine Equity for the Series B Preferred Stock	The Company reflected the following in mezzanine equity for the Series B Preferred Stock as of December 31, 2018 : Series B Preferred Shares Series B Preferred Stock Guaranteed Return Total (In thousands, except share data) Total Series B Preferred Stock at January 1, 2017 — $ — — — Issuance of Series B Preferred Stock 150,000 $ 150,000 $ — $ 150,000 Discount - upfront fees — (4,000 ) — (4,000 ) Discount - transaction costs — (6,017 ) — (6,017 ) Discount - bifurcated derivative — (625 ) — (625 ) Net Proceeds 150,000 139,358 — 139,358 Return (16% IRR) — — 2,273 2,273 Dividends declared and payable in cash — — (937 ) (937 ) Dividends declared and paid-in-kind 626 626 (626 ) — Accretion of Discount - deemed dividend — 174 — 174 Total Series B Preferred Stock at December 31, 2017 150,626 140,158 710 140,868 Discount - transaction costs — (20 ) — (20 ) Return (16% IRR) — — 22,092 22,092 Dividends declared and paid or payable in cash — — (9,174 ) (9,174 ) Dividends declared and paid-in-kind 6,120 6,120 (6,120 ) — Accretion of discount - deemed dividend — 1,345 — 1,345 Total Series B Preferred Stock at December 31, 2018 156,746 $ 147,603 $ 7,508 $ 155,111 The following table summarizes the changes in the outstanding preferred stock, common stock and Class A common warrants exercisable for shares of Class A Common Stock through the date of the Transaction. Series A Class A Class B Class F Total Class A Warrants Issued at formation — 588,276 — 4,312,500 4,900,776 588,276 Issued at IPO — 7,597,044 — — 7,597,044 7,597,044 Issued in connection with private placement — — — — — 8,408,838 Forfeitures/Cancellation of founder shares — — — (2,266,170 ) (2,266,170 ) — Conversion of founder shares — 3,475,665 — (2,046,330 ) 1,429,335 — Redemption of Class A shares — (5,804,404 ) — — (5,804,404 ) — Issued to Tema in connection with the Transaction — — 29,807,692 — 29,807,692 4,000,000 Preferred stock and warrants issued to PIPE Investors 75,000 — — — — 5,000,000 Preferred stock issued to Sponsor and Rosemore Holdings, Inc. 20,000 — — — — — Outstanding at the Transaction date 95,000 5,856,581 29,807,692 — 35,664,273 25,594,158

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of income tax expense were as follows for the periods indicated: Year Ended December 31, 2018 2017 2016 (In thousands) Current: State 5 — 148 5 — 148 Deferred: Federal 15,687 1,537 — State 2,470 153 — 18,157 1,690 — Income tax expense $ 18,162 $ 1,690 $ 148
Schedule of Effective Income Tax Rate Reconciliation	The following reconciles the income tax expense included in the consolidated statements of operations with the income tax expense that would result from the application of the statutory federal tax rate: Year Ended December 31, 2018 2017 2016 (In thousands) Income (Loss) before income taxes $ 136,124 $ (10,258 ) $ (15,041 ) Income tax expense (benefit) at federal statutory rate 28,586 (3,590 ) (5,264 ) Net (income) loss prior to transaction — (1,545 ) 5,264 Net (income) loss before income taxes attributable to noncontrolling interest (12,757 ) 6,584 — State income taxes, net of federal benefit 2,323 153 148 Nondeductible expenses — 88 — Effect of change in federal statutory rate — 1,941 — Change in valuation allowance — (1,941 ) — Other $ 10 $ — $ — Income tax expense $ 18,162 $ 1,690 $ 148
Schedule of Deferred Tax Balances	The components of the Company’s deferred tax balances were as follows for the periods indicated December 31, 2018 2017 (In thousands) Deferred tax assets: Deferred stock-based compensation — 232 Net operating loss carryforward 8,857 4,350 Other 16 30 Total deferred tax assets 8,873 4,612 Less: Valuation allowance — (2,912 ) Net deferred tax assets $ 8,873 $ 1,700 Deferred tax liabilities: Investment in Rosehill Operating (15,042 ) (1,700 ) State deferred tax liability (3,109 ) (153 ) Total deferred tax liabilities (18,151 ) (1,853 ) Net deferred tax liabilities $ (9,278 ) $ (153 )

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Schedule of Stockholders' Equity	The Company reflected the following in mezzanine equity for the Series B Preferred Stock as of December 31, 2018 : Series B Preferred Shares Series B Preferred Stock Guaranteed Return Total (In thousands, except share data) Total Series B Preferred Stock at January 1, 2017 — $ — — — Issuance of Series B Preferred Stock 150,000 $ 150,000 $ — $ 150,000 Discount - upfront fees — (4,000 ) — (4,000 ) Discount - transaction costs — (6,017 ) — (6,017 ) Discount - bifurcated derivative — (625 ) — (625 ) Net Proceeds 150,000 139,358 — 139,358 Return (16% IRR) — — 2,273 2,273 Dividends declared and payable in cash — — (937 ) (937 ) Dividends declared and paid-in-kind 626 626 (626 ) — Accretion of Discount - deemed dividend — 174 — 174 Total Series B Preferred Stock at December 31, 2017 150,626 140,158 710 140,868 Discount - transaction costs — (20 ) — (20 ) Return (16% IRR) — — 22,092 22,092 Dividends declared and paid or payable in cash — — (9,174 ) (9,174 ) Dividends declared and paid-in-kind 6,120 6,120 (6,120 ) — Accretion of discount - deemed dividend — 1,345 — 1,345 Total Series B Preferred Stock at December 31, 2018 156,746 $ 147,603 $ 7,508 $ 155,111 The following table summarizes the changes in the outstanding preferred stock, common stock and Class A common warrants exercisable for shares of Class A Common Stock through the date of the Transaction. Series A Class A Class B Class F Total Class A Warrants Issued at formation — 588,276 — 4,312,500 4,900,776 588,276 Issued at IPO — 7,597,044 — — 7,597,044 7,597,044 Issued in connection with private placement — — — — — 8,408,838 Forfeitures/Cancellation of founder shares — — — (2,266,170 ) (2,266,170 ) — Conversion of founder shares — 3,475,665 — (2,046,330 ) 1,429,335 — Redemption of Class A shares — (5,804,404 ) — — (5,804,404 ) — Issued to Tema in connection with the Transaction — — 29,807,692 — 29,807,692 4,000,000 Preferred stock and warrants issued to PIPE Investors 75,000 — — — — 5,000,000 Preferred stock issued to Sponsor and Rosemore Holdings, Inc. 20,000 — — — — — Outstanding at the Transaction date 95,000 5,856,581 29,807,692 — 35,664,273 25,594,158
Schedule of Equity for Series A Preferred Stock	The Company reflected the following in equity for the Series A Preferred Stock as of December 31, 2018 : December 31, 2018 2017 (In thousands) Liquidation Preference $ 101,669 $ 97,698 Discount (17,038 ) (17,038 ) Series A Preferred Stock $ 84,631 $ 80,660
Schedule of Dividends	The table below summarizes the Series A Preferred Stock dividends reflected in the Company’s Consolidated Statements of Operations: Year Ended December 31, 2018 2017 (In thousands) Series A Preferred Stock paid-in-kind $ 3,971 $ 5,530 Series A Preferred Stock paid or payable in cash 3,967 38 Series A Preferred Stock dividends 7,938 5,568 Deemed dividend related to beneficial conversion feature — 6,700 Deemed dividend related to conversion to Class A Common Stock — 668 Series A Preferred Stock dividends and deemed dividends $ 7,938 $ 12,936

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Share Activity	The following table sets forth market based performance share unit transactions for the year ended December 31, 2018 : Performance Restricted Stock Units Weighted-Average Grant Date Fair Value Nonvested - December 31, 2017 — $ — Granted 432,973 8.99 Vested (46,649 ) 8.99 Forfeited (101,909 ) 8.99 Nonvested - December 31, 2018 284,415 $ 8.99 The following table sets forth stock-settled time-based restricted stock unit transactions for the year ended December 31, 2018 : Restricted Stock Units Weighted-Average Grant Date Fair Value Nonvested - December 31, 2017 713,939 $ 9.88 Granted 549,150 6.62 Vested (347,512 ) 9.44 Forfeited (202,019 ) 7.96 Nonvested - December 31, 2018 713,558 $ 8.13 The following table sets forth cash-settled restricted stock unit transactions for the year ended December 31, 2018 : Cash-Settled Restricted Stock Units Weighted-Average Grant Date Fair Value Nonvested - December 31, 2017 — $ — Granted 98,743 6.62 Vested — — Forfeited (20,519 ) 6.60 Nonvested - December 31, 2018 78,224 $ 6.63 The following table sets forth the restricted stock transactions for the year ended December 31, 2018 : Restricted Stock Weighted-Average Grant Date Fair Value Outstanding - December 31, 2017 105,666 $ 7.95 Granted 246,653 6.24 Vested (105,666 ) 7.95 Forfeited — — Outstanding - December 31, 2018 246,653 $ 6.24
Schedule of Assumptions Used to Value the Market Based Performance Awards	The following assumptions were used to value the market based performance awards: Expected volatility 89.5 % Risk-free interest rate 2.4 % Dividend yield — % Expected life (years) 2.77

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Contractual Obligations	The following is a schedule of the Company’s future minimum lease payments with commitments that have initial or remaining lease terms in excess of one year as of December 31, 2018: 2019 2020 2021 2022 2023 Thereafter Total (In thousands) Operating lease obligations $ 1,213 $ 1,202 $ 1,097 $ 557 $ — $ — $ 4,069 Capital lease obligations 34 3 — — — — 37 Drilling commitments 6,525 — — — — — 6,525 Minimum volume commitment 1,692 1,692 1,526 380 — — 5,290 Total $ 9,464 $ 2,897 $ 2,623 $ 937 $ — $ — $ 15,921

Organization and Basis of Pre_2

Organization and Basis of Presentation (Details) - USD ($) $ in Thousands	Apr. 27, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Cash consideration		$ 4,005	$ 114,843	$ 0
Public offering proceeds, net of offering costs		39,356	90,780
Net proceeds from the sale of Series A Preferred Stock		0	150,000	0
Net proceeds from sale of common shares prior to the Transaction		40,511	$ 0	$ 0
Issued to Tema in connection with the Transaction
Variable Interest Entity [Line Items]
Warrants exercisable (shares)	4,000,000
Rosehill Operating
Variable Interest Entity [Line Items]
Cash consideration	$ 35,000
Initial public offering net of redemptions	$ 60,600
Warrants exercisable (shares)	4,000,000
Issued to Tema in connection with the Transaction
Variable Interest Entity [Line Items]
Working capital adjustment	$ 5,600	$ 2,400
Preferred stock and warrants issued to PIPE Investors
Variable Interest Entity [Line Items]
Issuance of stock (shares)	20,000
Preferred stock issued to Sponsor and Rosemore Holdings, Inc.
Variable Interest Entity [Line Items]
Public offering proceeds, net of offering costs	$ 20,000
Class B Common Stock | Rosehill Operating
Variable Interest Entity [Line Items]
Issuance of stock (shares)	29,807,692
Class A Common Stock | Rosehill Operating
Variable Interest Entity [Line Items]
Warrants exercisable (shares)	4,000,000
Series A Preferred Stock | Rosehill Operating
Variable Interest Entity [Line Items]
Issuance of stock (shares)	20,000
Net cash provided upon the closing of the Transaction	$ 109,500
Net proceeds from the sale of Series A Preferred Stock	90,800
Net proceeds from sale of common shares prior to the Transaction	$ 18,700
Series A Preferred Stock | Preferred stock and warrants issued to PIPE Investors
Variable Interest Entity [Line Items]
Issuance of stock (shares)	75,000
Proceeds from warrant exercises	$ 55,000
Private Placement | Class A Common Stock | Preferred stock and warrants issued to PIPE Investors
Variable Interest Entity [Line Items]
Issuance of stock (shares)	5,000,000
Private Placement | Series A Preferred Stock | Preferred stock and warrants issued to PIPE Investors
Variable Interest Entity [Line Items]
Issuance of stock (shares)	75,000
Stated interest rate	8.00%
Private Placement | Warrant | Preferred stock and warrants issued to PIPE Investors
Variable Interest Entity [Line Items]
Issuance of stock (shares)	5,000,000
Proceeds from warrant exercises	$ 70,800
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Ownership in variable interest entity (as a percent)	16.40%
Variable Interest Entity, Not Primary Beneficiary | Issued to Tema in connection with the Transaction
Variable Interest Entity [Line Items]
Ownership in variable interest entity (as a percent)	83.60%	68.40%
Variable Interest Entity, Primary Beneficiary | Issued to Tema in connection with the Transaction
Variable Interest Entity [Line Items]
Ownership in variable interest entity (as a percent)		31.60%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies and Recently Issued Accounting Standards - Schedule of Revenue by Major Customers (Details) - Customer Concentration Risk - Oil, natural gas and NGL sales	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Concentration risk (percent)	100.00%	100.00%	100.00%
Gateway
Concentration Risk [Line Items]
Concentration risk (percent)	60.00%	80.00%	70.00%
Plains
Concentration Risk [Line Items]
Concentration risk (percent)	17.00%	0.00%	0.00%
Targa
Concentration Risk [Line Items]
Concentration risk (percent)	13.00%	0.00%	0.00%
ETC Field Services, LLC
Concentration Risk [Line Items]
Concentration risk (percent)	0.00%	10.00%	17.00%
Enlink Midstream Services, LLC
Concentration Risk [Line Items]
Concentration risk (percent)	0.00%	0.00%	10.00%
Other
Concentration Risk [Line Items]
Concentration risk (percent)	10.00%	10.00%	3.00%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies and Recently Issued Accounting Standards - Narrative (Details)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Discount rate	10.00%
Other property and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Other property and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years

Earnings (Loss) Per Share - Sch

Earnings (Loss) Per Share - Schedule of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss) (numerator):
Net income (loss) attributable to common stockholders of Rosehill Resources Inc. - basic	$ 26,661	$ (8,520)	$ (15,189)
Add: Dividends on Series A Preferred Stock	7,938	0	0
Add: Net income attributable to the noncontrolling interest, net of taxes	47,432	0	0
Net income (loss) attributable to common stockholders of Rosehill Resources Inc. - diluted	$ 82,031	$ (8,520)	$ (15,189)
Weighted average shares (denominator):
Weighted average shares - basic (shares)	8,196	5,945	5,857
Add: Dilutive effects of Series A Preferred Stock (shares)	8,495	0	0
Add: Dilutive effects of Class B Common Stock (shares)	29,808	0	0
Weighted average shares – diluted (shares)	46,499	5,945	5,857
Basic income (loss) per share (USD per share)	$ 3.25	$ (1.43)	$ (2.59)
Diluted income (loss) per share (USD per share)	$ 1.76	$ (1.43)	$ (2.59)

Earnings (Loss) Per Share - Nar

Earnings (Loss) Per Share - Narrative (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Class B Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)		29.8
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	25.6	25.6
Series A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)		8.5
Long-Term Incentive Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	1	0.7

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable
Related Parties	$ 78	$ 16,022
Third-Parties	32,260	1,527
Revenue receivable
Accounts Receivable
Related Parties	0	13,601
Third-Parties	28,876	1,153
Realized derivative receivable
Accounts Receivable
Related Parties	0	0
Third-Parties	2,229	0
Transaction purchase price settlement
Accounts Receivable
Related Parties	0	2,381
Third-Parties	0	0
Joint interest billings
Accounts Receivable
Related Parties	0	20
Third-Parties	640	83
Other
Accounts Receivable
Related Parties	78	20
Third-Parties	$ 515	$ 291

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Details)	Dec. 08, 2017	Dec. 31, 2018	Dec. 31, 2017
Series B Preferred Stock
Derivative [Line Items]
Temporary equity, dividend rate (as a percent)	10.00%	10.00%	10.00%

Derivative Instruments - Assets

Derivative Instruments - Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Commodity derivatives - current	$ 30,819	$ 0
Commodity derivatives - non-current	58,314	0
Liabilities
Commodity derivatives - current	0	(10,772)
Commodity derivatives - non-current		(7,383)
Series B Preferred Stock bifurcated derivative - non-current	(696)	(625)
Total derivative liabilities	(696)	(18,780)
Gross Fair Value
Assets
Commodity derivatives - current	46,972	1,079
Commodity derivatives - non-current	88,008	120
Total assets	134,980	1,199
Liabilities
Commodity derivatives - current	(16,153)	(11,851)
Commodity derivatives - non-current	(29,694)	(7,503)
Series B Preferred Stock bifurcated derivative - non-current	(696)	(625)
Total derivative liabilities	(46,543)	(19,979)
Gross Amounts Offset
Assets
Commodity derivatives - current	(16,153)	(1,079)
Commodity derivatives - non-current	(29,694)	(120)
Total assets	(45,847)	(1,199)
Liabilities
Commodity derivatives - current	16,153	1,079
Commodity derivatives - non-current	29,694	120
Series B Preferred Stock bifurcated derivative - non-current	0	0
Total derivative liabilities	45,847	1,199
Net Recognized Fair Value
Assets
Commodity derivatives - current	30,819	0
Commodity derivatives - non-current	58,314	0
Total assets	89,133	0
Liabilities
Commodity derivatives - current	0	(10,772)
Commodity derivatives - non-current	0	(7,383)
Series B Preferred Stock bifurcated derivative - non-current	(696)	(625)
Total derivative liabilities	$ (696)	$ (18,780)

Derivative Instruments - Deriva

Derivative Instruments - Derivative Positions (Details) - Forecast gal in Thousands, bbl in Thousands, MMBTU in Thousands	12 Months Ended
	Dec. 31, 2022MMBTU$ / MMBTU$ / gal$ / bblbblgal	Dec. 31, 2021MMBTU$ / MMBTU$ / gal$ / bblbblgal	Dec. 31, 2020MMBTU$ / MMBTU$ / gal$ / bblbblgal	Dec. 31, 2019MMBTU$ / MMBTU$ / gal$ / bblbblgal
Oil
Derivative Instruments, Gain (Loss) [Line Items]
Notional volume | bbl	1,100	2,160	1,960	2,664
Weighted average fixed price ($/unit)	58.42	61.21	60.09	53.59
Natural gas
Derivative Instruments, Gain (Loss) [Line Items]
Weighted average fixed price ($/unit) | $ / MMBTU	2.87	2.85	2.84	2.88
Notional volume (MMBtu) | MMBTU	1,200	1,200	1,500	2,220
Ethane
Derivative Instruments, Gain (Loss) [Line Items]
Notional volume | gal	0	0	0	12,444
Weighted average fixed price ($/unit) | $ / gal	0	0	0	0.28
Propane
Derivative Instruments, Gain (Loss) [Line Items]
Notional volume | gal	0	0	0	8,296
Weighted average fixed price ($/unit) | $ / gal	0	0	0	0.79
Pentanes
Derivative Instruments, Gain (Loss) [Line Items]
Notional volume | gal	0	0	0	2,766
Weighted average fixed price ($/unit) | $ / gal	0	0	0	1.47
Commodity derivative two-way collars
Derivative Instruments, Gain (Loss) [Line Items]
Notional volume | bbl	0	0	0	601
Weighted average ceiling price ($/Bbl)	0	0	0	61.30
Weighted average floor price ($/Bbl)	0	0	0	55.21
Commodity derivative three-way collars
Derivative Instruments, Gain (Loss) [Line Items]
Notional volume | bbl	0	0	3,294	1,532
Weighted average ceiling price ($/Bbl)	0	0	70.29	68.52
Weighted average floor price ($/Bbl)	0	0	57.50	57.62
Weighted average sold put option price ($/Bbl)	0	0	47.50	45.51
Crude oil basis swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional volume | bbl	0	0	3,514	4,801
Weighted average fixed price ($/unit)	0	0	1.43	4.93
Natural gas basis swaps
Derivative Instruments, Gain (Loss) [Line Items]
Weighted average fixed price ($/unit) | $ / MMBTU	0	0	1.03	1.03
Notional volume (MMBtu) | MMBTU	0	0	2,096	1,781

Derivative Instruments - Gain (

Derivative Instruments - Gain (Loss) on Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Realized gain (loss) on derivatives
Realized gain (loss) on derivatives	$ (15,482)	$ 217	$ (823)
Total realized gain (loss) on derivatives	(15,482)	74	(1,608)
Unrealized gain (loss) on derivatives
Unrealized gain (loss) on derivatives	108,086	(16,553)	(3,346)
Total unrealized gain (loss) on derivatives	108,015	(16,779)	(3,022)
Commodity derivative options
Realized gain (loss) on derivatives
Realized gain (loss) on derivatives	(83)	172	511
Unrealized gain (loss) on derivatives
Unrealized gain (loss) on derivatives	28,965	313	(1,508)
Commodity derivative swaps
Realized gain (loss) on derivatives
Realized gain (loss) on derivatives	(15,399)	45	(1,334)
Unrealized gain (loss) on derivatives
Unrealized gain (loss) on derivatives	79,121	(16,866)	(1,838)
Interest rate swap
Realized gain (loss) on derivatives
Total realized gain (loss) on derivatives	0	(143)	(785)
Unrealized gain (loss) on derivatives
Total unrealized gain (loss) on derivatives	0	(226)	(3,346)
Series B Preferred Stock bifurcated derivative
Unrealized gain (loss) on derivatives
Total unrealized gain (loss) on derivatives	$ (71)	$ 0	$ 324

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative assets
Derivative assets - current	$ 30,819	$ 0
Derivative assets - non-current	58,314	0
Total derivative assets	89,133	0
Derivative liabilities
Derivative liabilities - current	0	(10,772)
Derivative liabilities - non-current	(696)	(8,008)
Commodity derivative liabilities - non-current		(7,383)
Series B Preferred Stock bifurcated derivative - non-current	696	625
Total derivative liabilities	(696)	(18,780)
Total derivative, net	88,437	(18,780)
Level 1
Derivative assets
Derivative assets - current	0
Derivative assets - non-current	0
Total derivative assets	0
Derivative liabilities
Derivative liabilities - current		0
Commodity derivative liabilities - non-current		0
Series B Preferred Stock bifurcated derivative - non-current	0	0
Total derivative liabilities	0	0
Level 2
Derivative assets
Derivative assets - current	30,819
Derivative assets - non-current	58,314
Total derivative assets	89,133
Derivative liabilities
Derivative liabilities - current		(10,772)
Commodity derivative liabilities - non-current		(7,383)
Series B Preferred Stock bifurcated derivative - non-current	0	0
Total derivative liabilities	0	(18,155)
Level 3
Derivative assets
Derivative assets - current	0
Derivative assets - non-current	0
Total derivative assets	0
Derivative liabilities
Derivative liabilities - current		0
Commodity derivative liabilities - non-current		0
Series B Preferred Stock bifurcated derivative - non-current	696	625
Total derivative liabilities	$ (696)	$ (625)

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Dec. 08, 2017	Dec. 31, 2018	Dec. 31, 2017
Second Lien Notes | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		10.00%
Series B Preferred Stock
Debt Instrument [Line Items]
Temporary equity, dividend rate (as a percent)	10.00%	10.00%	10.00%
Level 2 | Second Lien Notes | Senior Notes
Debt Instrument [Line Items]
Fair value of Second Lien Notes		$ 95.2

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Changes in Fair Value of Level 3 Liabilities (Details) - Level 3 $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 625
(Gains) losses reported in earnings	71
Ending Balance	$ 696

Property and equipment - Schedu

Property and equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment, net	$ 669,389	$ 432,615
Total oil and natural gas properties (successful efforts), net
Property, Plant and Equipment [Line Items]
Less: accumulated DD&A and impairment	(234,265)	(114,375)
Total property and equipment, net	666,797	431,332
Proved oil and natural gas properties
Property, Plant and Equipment [Line Items]
Property and equipment, gross	777,558	423,611
Unproved oil and natural gas properties
Property, Plant and Equipment [Line Items]
Property and equipment, gross	121,929	121,690
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,575	406
Other property and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,059	4,345
Less: accumulated DD&A and impairment	(3,467)	(3,062)
Total property and equipment, net	$ 2,592	$ 1,283

Property and equipment - Narrat

Property and equipment - Narrative (Details) - USD ($)	Nov. 02, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
DD&A related to oil and natural gas properties			$ 140,400,000	$ 35,400,000	$ 24,400,000
Depreciation and amortization expense			141,815,000	36,091,000	24,965,000
Capitalized costs included in proved oil and natural gas properties not subject to DD&A			87,100,000	57,200,000
Impairment charges related to proved and unproved oil and natural gas properties			0	1,061,000	0
Exploratory well costs pending determination of proved reserves			0	0
Unsuccessful exploratory dry hole costs			0	200,000	0
Payments for acquisition			4,005,000	114,843,000	0
Purchase price in escrow		$ 4,005,000	0	4,005,000	0
Other property and equipment
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense			700,000	400,000	$ 400,000
White Wolf Acquisition
Property, Plant and Equipment [Line Items]
Payments for acquisition		116,600,000
Transaction fees		2,900,000
Acquired asset retirement obligation		1,600,000
Total consideration paid		121,100,000
Purchase price in escrow		$ 4,000,000		4,000,000
Other Acquisitions
Property, Plant and Equipment [Line Items]
Total consideration paid			$ 15,300,000	$ 6,500,000
Barnett Shale | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Property, Plant and Equipment [Line Items]
Total consideration paid	$ 6,500,000
Consideration received for disposal	7,100,000
Gain (loss) on disposal	$ 5,300,000

Asset Retirement Obligations (D

Asset Retirement Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations, beginning of year	$ 8,630	$ 5,431
Additional liabilities incurred	4,480	5,389
Dispositions	0	(2,380)
Accretion expense	638	317
Liabilities settled upon plugging and abandoning wells	(441)	(504)
Revision of estimates	217	377
Asset retirement obligations, end of year	13,524	8,630
Less: current portion of asset retirement obligations	0	108
Long-term asset retirement obligations	$ 13,524	$ 8,522

Accrued Liabilities and Other_2

Accrued Liabilities and Other (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued payroll	$ 3,764	$ 2,352
Royalties payable	11,511	3,903
Accrued lease operating expense	3,992	2,230
Contingent liability - White Wolf Acquisition	0	4,005
Preferred Stock dividends payable	3,362	937
Accrued interest expense	925	639
Accrued production taxes	1,234	147
Accrued ad valorem taxes	1,066	0
Accrued debt issuance costs	631	0
Other	850	1,279
Total accrued liabilities and other	$ 27,335	$ 15,492

Long-term debt, net - Schedule

Long-term debt, net - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 294,000	$ 100,000
Total debt issuance cost and discounts	7,709	7,479
Total long-term debt, net	288,298	93,199
Revolving credit facility | Line of Credit
Debt Instrument [Line Items]
Total debt	194,000	0
Debt issuance cost on Second Lien Notes, net	2,007	678
Second Lien Notes | Senior Notes
Debt Instrument [Line Items]
Total debt	100,000	100,000
Debt issuance cost on Second Lien Notes, net	3,211	3,830
Discount on Second Lien Notes, net	2,491	2,971
Total debt issuance cost and discounts	$ 5,702	$ 6,801

Long-term debt, net - Narrative

Long-term debt, net - Narrative (Details)

Mar. 28, 2018USD ($)redetermination

Dec. 08, 2017USD ($)

Dec. 31, 2012USD ($)

Dec. 08, 2021

Dec. 08, 2020

Dec. 31, 2018USD ($)

Dec. 31, 2017USD ($)

Dec. 31, 2016USD ($)

Mar. 28, 2019USD ($)

Dec. 05, 2018USD ($)

Jun. 29, 2018USD ($)

Apr. 27, 2017USD ($)

Line of Credit Facility [Line Items]

Available interim unscheduled redeterminations | redetermination

1

Consecutive semiannual redeterminations | redetermination

2

Amortized debt issuance costs and discounts

$ 2,139,000

$ 274,000

$ 113,000

Rosehill Operating

Line of Credit Facility [Line Items]

Outstanding balance under Tema Credit Agreement

$ 55,000,000

Credit Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Weighted-average interest rate (as a percent)

5.308%

Credit facility - maximum borrowing capacity

$ 500,000,000

Credit facility - borrowing base

$ 150,000,000

$ 220,000,000

$ 210,000,000

Credit Agreement | Rosehill Operating | Revolving Credit Facility

Line of Credit Facility [Line Items]

Working capital ratio, minimum

1

Leverage ratio maximum

4

Minimum | Base Rate | Credit Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate (as a percent)

1.00%

Minimum | London Interbank Offered Rate (LIBOR) | Credit Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate (as a percent)

2.00%

Maximum | Base Rate | Credit Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate (as a percent)

2.00%

Maximum | London Interbank Offered Rate (LIBOR) | Credit Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate (as a percent)

3.00%

Second Lien Notes | Senior Notes

Line of Credit Facility [Line Items]

Stated interest rate

10.00%

Second Lien Notes | Senior Notes | Rosehill Operating

Line of Credit Facility [Line Items]

Leverage ratio maximum

4

Aggregate principal amount

$ 100,000,000

Stated interest rate

10.00%

Redemption price (as a percent)

101.00%

Second Lien Notes | Senior Notes | Forecast | Rosehill Operating

Line of Credit Facility [Line Items]

Redemption price (as a percent)

101.50%

103.00%

Series B Preferred Stock | Credit Agreement | Rosehill Operating

Line of Credit Facility [Line Items]

Working capital ratio, minimum

2.5

Leverage ratio maximum

4

Issued to Tema in connection with the Transaction | Credit Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Credit facility - maximum borrowing capacity

$ 75,000,000

Secured line of credit

$ 60,000,000

Issued to Tema in connection with the Transaction | London Interbank Offered Rate (LIBOR) | Credit Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Basis spread on variable rate (as a percent)

1.00%

Subsequent Event | Credit Agreement | Revolving Credit Facility

Line of Credit Facility [Line Items]

Credit facility - borrowing base

$ 300,000,000

Long-term debt, net - Schedul_2

Long-term debt, net - Schedule of Maturities of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
2019	$ 0
2020	0
2021	0
2022	194,000
2023	100,000
Long-term debt	$ 294,000	$ 100,000

Long-term debt, net - Schedul_3

Long-term debt, net - Schedule of Deferred Financing Costs and Debt Discounts (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total deferred financing costs and debt discount, net	$ 7,709	$ 7,479
Second Lien Notes | Senior Notes
Debt Instrument [Line Items]
Debt issuance costs	3,868	3,868
Accumulated amortization of debt issuance costs	(657)	(38)
Net deferred costs - Revolving credit facility	3,211	3,830
Debt discount	3,000	3,000
Accumulated amortization of debt discount	(509)	(29)
Total deferred financing costs and debt discount, net	5,702	6,801
Revolving credit facility | Line of Credit
Debt Instrument [Line Items]
Debt issuance costs	2,368	1,219
Accumulated amortization of debt issuance costs	(361)	(541)
Net deferred costs - Revolving credit facility	$ 2,007	$ 678

10% Series B Redeemable Prefe_3

10% Series B Redeemable Preferred Stock - Narrative (Details) - Series B Preferred Stock - USD ($) $ / shares in Units, $ in Millions	Dec. 09, 2019	Dec. 08, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 08, 2019	Dec. 08, 2018
Class of Stock [Line Items]
Temporary equity, stock issued (shares)		150,000						150,000
Temporary equity, dividend rate (as a percent)		10.00%					10.00%	10.00%
Temporary equity, par value (USD per share)		$ 0.0001	$ 0.0001				$ 0.0001	$ 0.0001
Principal amount of temporary equity		$ 150
Transactions costs and up-front fees		$ 10
Temporary equity, additional stock authorized (shares)		50,000
Temporary equity, liquidation preference (USD per share)		$ 1,000	$ 1,000				$ 1,000	$ 1,000		$ 1,250
Dividend paid out in stock (as a percent)			40.00%	40.00%	40.00%	40.00%
Discount on derivative liability			$ 0.6				$ 0.6
Dividends declared on preferred stock (USD per share)			$ 25.21	$ 25.21	$ 24.93	$ 24.66
Dividends paid in cash (as a percent)			60.00%	60.00%	60.00%	60.00%
Maximum
Class of Stock [Line Items]
Dividend paid out in stock (as a percent)		40.00%
Forecast
Class of Stock [Line Items]
Temporary equity, liquidation preference (USD per share)	$ 1,500								$ 1,350
Required internal rate of return (as a percent)	16.00%

10% Series B Redeemable Prefe_4

10% Series B Redeemable Preferred Stock - Schedule of Mezzanine Equity for the Series B Preferred Stock (Details) - Series B Preferred Stock - USD ($) $ in Thousands	Dec. 08, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at the beginning of period, Temporary equity, stock outstanding (shares)		150,626	0
Balance at the beginning of period, Temporary equity, carrying amount before guaranteed return		$ 140,158	$ 0
Balance at the beginning of period, Temporary equity, Guaranteed Return		710	0
Balance at the beginning of period, Temporary equity, Total		140,868	$ 0
Issuance of Series B Preferred Stock (shares)	150,000		150,000
Issuance of Series B Preferred Stock			$ 150,000
Discount - upfront fees			(4,000)
Discount - transaction costs		(20)	(6,017)
Discount - bifurcated derivative			(625)
Net Proceeds			139,358
Return (16% IRR)		22,092	2,273
Dividends declared and paid or payable in cash		$ (9,174)	$ (937)
Dividends declared and paid-in-kind (shares)		6,120	626
Preferred Stock dividends paid-in-kind		$ 6,120	$ 626	$ 0
Dividends declared and paid-in-kind, Guaranteed Return		(6,120)	(626)
Dividends declared and paid-in-kind, Total		0	0
Accretion of discount - deemed dividend		$ 1,345	$ 174	$ 0
Balance at the end of period, Temporary equity, stock outstanding (shares)		156,746	150,626	0
Balance at the end of period, Temporary equity, carrying amount before guaranteed return		$ 147,603	$ 140,158	$ 0
Balance at the end of period, Temporary equity, Guaranteed Return		7,508	710	0
Balance at the end of period, Temporary equity, Total		$ 155,111	$ 140,868	$ 0

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
State	$ 5	$ 0	$ 148
Current	5	0	148
Deferred:
Federal	15,687	1,537	0
State	2,470	153	0
Deferred	18,157	1,690	0
Income tax expense	$ 18,162	$ 1,690	$ 148

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Effective tax rate (as a percent)		13.30%	16.50%	1.00%
Operating loss carryforwards		$ 38,100,000
Valuation allowance	$ 2,912,000	0	$ 2,912,000
Deferred tax liabilities	153,000	$ 9,278,000	153,000
Tax Receivable Agreement | Issued to Tema in connection with the Transaction
Income Tax Contingency [Line Items]
Deferred tax assets	5,700,000		$ 5,700,000
Increase (decrease) of valuation allowance	$ 200,000
Payment of net cash savings (as a percent)		90.00%
Deferred tax liabilities		$ 3,500,000
Payment of estimated future cash tax savings (as a percent)		90.00%

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income (Loss) before income taxes	$ 136,124	$ (10,258)	$ (15,041)
Income tax expense (benefit) at federal statutory rate	28,586	(3,590)	(5,264)
Net (income) loss prior to transaction	0	(1,545)	5,264
Net (income) loss before income taxes attributable to noncontrolling interest	(12,757)	6,584	0
State income taxes, net of federal benefit	2,323	153	148
Nondeductible expenses	0	88	0
Effect of change in federal statutory rate	0	1,941	0
Change in valuation allowance	0	(1,941)	0
Other	10	0	0
Income tax expense	$ 18,162	$ 1,690	$ 148

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Deferred stock-based compensation	$ 0	$ 232
Net operating loss carryforward	8,857	4,350
Other	16	30
Total deferred tax assets	8,873	4,612
Less: Valuation allowance	0	(2,912)
Net deferred tax assets	8,873	1,700
Deferred tax liabilities:
Investment in Rosehill Operating	(15,042)	(1,700)
State deferred tax liability	(3,109)	(153)
Total deferred tax liabilities	(18,151)	(1,853)
Net deferred tax liabilities	$ (9,278)	$ (153)

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Stockholders' Equity (Details) - shares	Apr. 27, 2017	Dec. 31, 2018	Dec. 31, 2017
Preferred Stock
Class of Stock [Line Items]
Issued			95,000
Preferred Stock | Series A Preferred Stock
Class of Stock [Line Items]
Outstanding at the Transaction date			95,000
Common Stock
Class of Stock [Line Items]
Issued			4,900,776
Issued at IPO			7,597,044
Forfeitures/Cancellation of founder shares			(2,266,170)
Conversion of founder shares			1,429,335
Redemption of Class A shares			(5,804,404)
Outstanding at the Transaction date			35,664,273
Common Stock | Class A Common Stock
Class of Stock [Line Items]
Issued		6,990,744	588,276
Issued at IPO			7,597,044
Conversion of founder shares			3,475,665
Redemption of Class A shares			(5,804,404)
Outstanding at the Transaction date			5,856,581
Common Stock | Class B Common Stock
Class of Stock [Line Items]
Outstanding at the Transaction date			29,807,692
Common Stock | Class F Common Stock
Class of Stock [Line Items]
Issued			4,312,500
Forfeitures/Cancellation of founder shares			(2,266,170)
Conversion of founder shares			(2,046,330)
Outstanding at the Transaction date			0
Common Stock | Class A Common Stock Warrants
Class of Stock [Line Items]
Issued			588,276
Issued at IPO			7,597,044
Issued in connection with private placement			8,408,838
Outstanding at the Transaction date			25,594,158
Preferred stock and warrants issued to PIPE Investors
Class of Stock [Line Items]
Issued	20,000
Preferred stock and warrants issued to PIPE Investors | Series A Preferred Stock
Class of Stock [Line Items]
Issued	75,000
Preferred stock and warrants issued to PIPE Investors | Preferred Stock | Series A Preferred Stock
Class of Stock [Line Items]
Issued			75,000
Preferred stock and warrants issued to PIPE Investors | Common Stock | Class A Common Stock Warrants
Class of Stock [Line Items]
Issued			5,000,000
Preferred stock issued to Sponsor and Rosemore Holdings, Inc. | Preferred Stock | Series A Preferred Stock
Class of Stock [Line Items]
Issued			20,000
Issued to Tema in connection with the Transaction | Common Stock
Class of Stock [Line Items]
Issued			29,807,692
Issued to Tema in connection with the Transaction | Common Stock | Class B Common Stock
Class of Stock [Line Items]
Issued			29,807,692
Issued to Tema in connection with the Transaction | Common Stock | Class A Common Stock Warrants
Class of Stock [Line Items]
Issued			4,000,000

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands	Oct. 05, 2018USD ($)shares	Oct. 02, 2018USD ($)$ / sharesshares	Apr. 27, 2017USD ($)shares	Apr. 30, 2017shares	Dec. 31, 2018$ / sharesshares	Sep. 30, 2018$ / shares	Jun. 30, 2018$ / shares	Mar. 31, 2018$ / shares	Dec. 31, 2018USD ($)trading_day$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Sep. 27, 2018shares
Class of Stock [Line Items]
Securities called by warrant (shares)			4,000,000
Public offering proceeds, net of offering costs | $									$ 39,356	$ 90,780
Beneficial conversion feature | $										$ 6,700
Issued to Tema in connection with the Transaction
Class of Stock [Line Items]
Warrants exercisable (shares)			4,000,000
Rosehill Operating
Class of Stock [Line Items]
Warrants exercisable (shares)			4,000,000
Preferred stock and warrants issued to PIPE Investors
Class of Stock [Line Items]
Issuance of stock and warrants (shares)			20,000
Preferred stock and warrants issued to PIPE Investors | Private Placement Warrants
Class of Stock [Line Items]
Proceeds from (repurchase of) equity | $			$ 70,800
Stock issued in transaction (shares)			476,540
Preferred stock issued to Sponsor and Rosemore Holdings, Inc.
Class of Stock [Line Items]
Public offering proceeds, net of offering costs | $			$ 20,000
Sponsor | Early Bird Capital Inc. | Private Placement Warrants
Class of Stock [Line Items]
Securities called by warrant (shares)					8,408,838				8,408,838
Common Stock
Class of Stock [Line Items]
Issuance of stock and warrants (shares)										4,900,776
Common Stock | Issued to Tema in connection with the Transaction
Class of Stock [Line Items]
Issuance of stock and warrants (shares)										29,807,692
Warrant
Class of Stock [Line Items]
Securities called by warrant (shares)					588,276				588,276
Class of warrant redemption threshold trading days | trading_day									20
Period of class of warrant redemption threshold trading days | trading_day									30
Warrants outstanding (shares)					25,594,158				25,594,158
Warrant | IPO
Class of Stock [Line Items]
Securities called by warrant (shares)					7,597,044				7,597,044
Warrant | Issued to Tema in connection with the Transaction
Class of Stock [Line Items]
Securities called by warrant (shares)			4,000,000
Warrant | PIPE Investors
Class of Stock [Line Items]
Securities called by warrant (shares)			5,000,000
Class A Common Stock
Class of Stock [Line Items]
Exercise price of warrants (USD per share) | $ / shares					$ 21				$ 21
Common stock issued (shares)					13,760,136				13,760,136	6,222,299
Class A Common Stock | Rosehill Operating
Class of Stock [Line Items]
Warrants exercisable (shares)			4,000,000
Class A Common Stock | Preferred stock and warrants issued to PIPE Investors | Private Placement Warrants
Class of Stock [Line Items]
Issuance of stock and warrants (shares)			5,000,000
Class A Common Stock | Common Stock
Class of Stock [Line Items]
Exercise price of warrants (USD per share) | $ / shares					$ 18				$ 18
Issuance of stock and warrants (shares)									6,990,744	588,276
Conversion of founder shares										246,262
Class A Common Stock | Common Stock | Sponsor | Securities Subscription Agreement
Class of Stock [Line Items]
Conversion of founder shares				3,475,665
Common Stock Subscribed
Class of Stock [Line Items]
Common stock issued (shares)	840,744	6,150,000
Share price (USD per share) | $ / shares		$ 6.10
Discount per share on common stock exercise (USD per share) | $ / shares		$ 5.795
Option to purchase additional shares (shares)											922,500
Proceeds, net of underwriting discounts and commissions and offering costs | $	$ 4,900	$ 34,500
Class B Common Stock
Class of Stock [Line Items]
Common stock issued (shares)					29,807,692				29,807,692	29,807,692
Class B Common Stock | Rosehill Operating
Class of Stock [Line Items]
Issuance of stock and warrants (shares)			29,807,692
Class B Common Stock | Common Stock | Issued to Tema in connection with the Transaction
Class of Stock [Line Items]
Issuance of stock and warrants (shares)										29,807,692
8.0% Series A Cumulative Perpetual Preferred Stock
Class of Stock [Line Items]
Series A preferred stock, liquidation preference (USD per share) | $ / shares					$ 1,000				$ 1,000
8.0% Series A Cumulative Perpetual Preferred Stock | Preferred stock and warrants issued to PIPE Investors
Class of Stock [Line Items]
Issuance of stock and warrants (shares)			20,000
8.0% Series A Cumulative Perpetual Preferred Stock | Preferred stock issued to Sponsor and Rosemore Holdings, Inc.
Class of Stock [Line Items]
Public offering proceeds, net of offering costs | $			$ 20,000
8% Series A Cumulative Perpetual Convertible Preferred Stock
Class of Stock [Line Items]
Share price (USD per share) | $ / shares					$ 11.5				$ 11.5
Stock issued upon conversion of convertible preferred stock (shares)					86.9565				86.9565
Series A Preferred Stock
Class of Stock [Line Items]
Series A preferred stock, liquidation preference (USD per share) | $ / shares					$ 1,000				$ 1,000	$ 1,000
Dividends declared on preferred stock (USD per share) | $ / shares					$ 20.16	$ 20.16	$ 19.95	$ 19.73
Dividends paid in cash (as a percent)					50.00%	50.00%	50.00%	50.00%
Dividend paid out in stock (as a percent)					50.00%	50.00%	50.00%	50.00%
Series A Preferred Stock | Rosehill Operating
Class of Stock [Line Items]
Issuance of stock and warrants (shares)			20,000
Series A Preferred Stock | Preferred stock and warrants issued to PIPE Investors
Class of Stock [Line Items]
Issuance of stock and warrants (shares)			75,000
Common stock outstanding (as a percent)			30.00%
Series A Preferred Stock | Preferred stock and warrants issued to PIPE Investors | Private Placement Warrants
Class of Stock [Line Items]
Issuance of stock and warrants (shares)			75,000
Series A Preferred Stock | Sponsor | Preferred stock issued to Sponsor and Rosemore Holdings, Inc.
Class of Stock [Line Items]
Issuance of stock and warrants (shares)			20,000
First anniversary
Class of Stock [Line Items]
Sale of stock, ownership after transaction (as a percent)									33.00%
Second anniversary
Class of Stock [Line Items]
Sale of stock, ownership after transaction (as a percent)									67.00%
Minimum | Class A Common Stock | Common Stock
Class of Stock [Line Items]
Exercise price of warrants (USD per share) | $ / shares					$ 16				$ 16
Variable Interest Entity, Not Primary Beneficiary
Class of Stock [Line Items]
Ownership in variable interest entity (as a percent)			16.40%
Variable Interest Entity, Not Primary Beneficiary | Issued to Tema in connection with the Transaction
Class of Stock [Line Items]
Ownership in variable interest entity (as a percent)			83.60%						68.40%

Stockholders' Equity - Schedu_2

Stockholders' Equity - Schedule of Equity for Series A Preferred Stock (Details) - Series A Preferred Stock - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Liquidation Preference	$ 101,669	$ 97,698
Discount	(17,038)	(17,038)
Series A Preferred Stock	$ 84,631	$ 80,660

Stockholders' Equity - Schedu_3

Stockholders' Equity - Schedule of Dividends (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Series A Preferred Stock paid or payable in cash	$ 3,967	$ 38
Series A Preferred Stock dividends and deemed dividends	7,938	12,936
Series A Preferred Stock
Class of Stock [Line Items]
Series A Preferred Stock paid-in-kind	3,971	5,530	$ 0
Series A Preferred Stock paid or payable in cash	3,967	38
Series A Preferred Stock dividends and deemed dividends	7,938	5,568
Deemed dividend related to beneficial conversion feature	0	6,700
Deemed dividend related to conversion to Class A Common Stock	$ 0	$ 668

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($)	Jan. 01, 2019	Mar. 26, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 27, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 6,500,000	$ 1,200,000	$ 0
Employer matching contributions			300,000	$ 100,000	$ 100,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized			$ 900,000
Period for recognition of compensation not yet recognized			8 months 1 day
Awards granted (shares)			246,653
Awards granted (USD per share)			$ 6.24
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized			$ 4,000,000
Period for recognition of compensation not yet recognized			1 year 8 months 16 days
Awards granted (shares)			549,150
Awards granted (USD per share)			$ 6.62
Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized			$ 1,800,000
Period for recognition of compensation not yet recognized			2 years
Awards granted (shares)		432,973	432,973
Awards granted (USD per share)		$ 8.99	$ 8.99
Cash-Settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized			$ 100,000
Period for recognition of compensation not yet recognized			2 years 2 months 27 days
Awards granted (shares)			98,743
Awards granted (USD per share)			$ 6.62
Liability for cash-settled restricted stock units			$ 100,000
Closing price (USD per share)			$ 2.23
Long-Term Incentive Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issuance authorized (shares)						7,500,000
Stock available for issuance (shares)			5,757,254
Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution (as a percent)			100.00%
Employer matching contribution in relation to gross pay (as a percent)			3.00%
Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution (as a percent)			50.00%
Tranche Two | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution in relation to gross pay (as a percent)			3.00%
Tranche Two | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution in relation to gross pay (as a percent)			5.00%
Subsequent Event | Tranche Two | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution in relation to gross pay (as a percent)	6.00%

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Nonvested Share Activity (Details) - $ / shares	Mar. 26, 2018	Dec. 31, 2018
Restricted Stock
Number of Shares
Outstanding at beginning of period (shares)		105,666
Granted (shares)		246,653
Forfeited (shares)		(105,666)
Vested (shares)		0
Outstanding at end of period (shares)		246,653
Weighted-Average Grant Date Fair Value
Outstanding at beginning of period (USD per share)		$ 7.95
Granted (USD per share)		6.24
Forfeited (USD per share)		7.95
Vested (USD per share)		0
Outstanding at end of period (USD per share)		$ 6.24
Restricted Stock Units
Number of Shares
Outstanding at beginning of period (shares)		713,939
Granted (shares)		549,150
Forfeited (shares)		(347,512)
Vested (shares)		(202,019)
Outstanding at end of period (shares)		713,558
Weighted-Average Grant Date Fair Value
Outstanding at beginning of period (USD per share)		$ 9.88
Granted (USD per share)		6.62
Forfeited (USD per share)		9.44
Vested (USD per share)		7.96
Outstanding at end of period (USD per share)		$ 8.13
Performance Restricted Stock Units
Number of Shares
Outstanding at beginning of period (shares)		0
Granted (shares)	432,973	432,973
Forfeited (shares)		(46,649)
Vested (shares)		(101,909)
Outstanding at end of period (shares)		284,415
Weighted-Average Grant Date Fair Value
Outstanding at beginning of period (USD per share)		$ 0
Granted (USD per share)	$ 8.99	8.99
Forfeited (USD per share)		8.99
Vested (USD per share)		8.99
Outstanding at end of period (USD per share)		$ 8.99
Cash-Settled Restricted Stock Units
Number of Shares
Outstanding at beginning of period (shares)		0
Granted (shares)		98,743
Forfeited (shares)		0
Vested (shares)		(20,519)
Outstanding at end of period (shares)		78,224
Weighted-Average Grant Date Fair Value
Outstanding at beginning of period (USD per share)		$ 0
Granted (USD per share)		6.62
Forfeited (USD per share)		0
Vested (USD per share)		6.60
Outstanding at end of period (USD per share)		$ 6.63

Stock-Based Compensation - Sc_2

Stock-Based Compensation - Schedule of Assumptions Used to Value the Market Based Performance Awards (Details) - Performance Restricted Stock Units	12 Months Ended
	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility (as a percent)	89.50%
Risk-free interest rate (as a percent)	2.40%
Dividend yield (as a percent)	0.00%
Expected life (years)	2 years 9 months 7 days

Transactions with Related Par_2

Transactions with Related Parties (Details) - USD ($)	Apr. 27, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Overhead costs				$ 1,500,000	$ 6,000,000
Other general and administrative			$ 30,469,000	13,428,000	6,166,000
Rosemore, Inc.
Related Party Transaction [Line Items]
Overhead costs			0	800,000
Reimbursement of related party transaction expenses	$ 2,400,000
Issued to Tema in connection with the Transaction
Related Party Transaction [Line Items]
Due from related parties				100,000
Reimbursement of related party transaction expenses	1,600,000
Working capital adjustment	$ 5,600,000		2,400,000
Issued to Tema in connection with the Transaction | Transition Service Agreement
Related Party Transaction [Line Items]
Due from related parties				100,000	300,000
Gateway
Related Party Transaction [Line Items]
Due from related parties			13,600,000	0
Revenue from related parties			181,200,000	61,300,000	24,400,000
Gateway | Crude Oil Gathering Agreement
Related Party Transaction [Line Items]
Due to related parties			300,000
Costs and expenses, related party			600,000
Gateway | Marketing and gathering agreement
Related Party Transaction [Line Items]
Due to related parties			0	200,000
Costs and expenses, related party			3,300,000	1,100,000	1,400,000
Gateway | Crude Oil Marketing Consulting Agreement
Related Party Transaction [Line Items]
Costs and expenses, related party			100,000
Seawolf | Water Purchase Agreement
Related Party Transaction [Line Items]
Due to related parties			600,000
Costs and expenses, related party			$ 1,200,000
Rosehill Operating | Rosemore, Inc.
Related Party Transaction [Line Items]
Overhead costs				9,600,000	6,000,000
White Wolf Acquisition
Related Party Transaction [Line Items]
Cash fee (percent)		2.50%
Advisory fee paid		$ 7,500,000
Series B Preferred Stock | White Wolf Acquisition
Related Party Transaction [Line Items]
Commitment received		200,000,000
Senior Notes | Second Lien Notes | White Wolf Acquisition
Related Party Transaction [Line Items]
Commitment received		$ 100,000,000
Other General And Administrative Expense | Gateway
Related Party Transaction [Line Items]
General and administrative expense (less than)				100,000	100,000
General and Administrative Expense | Gateway
Related Party Transaction [Line Items]
Other general and administrative				$ 100,000	$ 300,000

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Contractual Obligations (Details) $ in Thousands	Dec. 31, 2018USD ($)
Operating lease obligations
2019	$ 1,213
2020	1,202
2021	1,097
2022	557
2023	0
Thereafter	0
Total	4,069
Capital lease obligations
2019	34
2020	3
2021	0
2022	0
2023	0
Thereafter	0
Total	37
Drilling commitments
2019	6,525
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Total	6,525
Minimum volume commitment
2019	1,692
2020	1,692
2021	1,526
2022	380
2023	0
Thereafter	0
Total	5,290
Total
2019	9,464
2020	2,897
2021	2,623
2022	937
2023	0
Thereafter	0
Total	$ 15,921

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Lease operating expenses	$ 1.2	$ 1	$ 0.7

Uncategorized Items - rose-2018

Label	Element	Value
Escrow Deposit	us-gaap_EscrowDeposit	$ 0
Escrow Deposit	us-gaap_EscrowDeposit	4,005,000
Escrow Deposit	us-gaap_EscrowDeposit	0
Redeemable Preferred Stock [Member]
Dividends Payable	us-gaap_DividendsPayableCurrentAndNoncurrent	0
Dividends Payable	us-gaap_DividendsPayableCurrentAndNoncurrent	937,000
Dividends Payable	us-gaap_DividendsPayableCurrentAndNoncurrent	2,347,000
Temporary Equity, Guaranteed Return	rose_TemporaryEquityGuaranteedReturn	0
Temporary Equity, Guaranteed Return	rose_TemporaryEquityGuaranteedReturn	710,000
Temporary Equity, Guaranteed Return	rose_TemporaryEquityGuaranteedReturn	6,798,000
Series A Preferred Stock [Member]
Dividends Payable	us-gaap_DividendsPayableCurrentAndNoncurrent	0
Dividends Payable	us-gaap_DividendsPayableCurrentAndNoncurrent	0
Dividends Payable	us-gaap_DividendsPayableCurrentAndNoncurrent	$ 1,015,000