Liberty Energy (LBRT) 10-Q 1 Aug 19 2019 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Class of Stock [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Registrant Name	Liberty Oilfield Services Inc.
Entity Central Index Key	0001694028
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Shares of Class A Common Stock
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		75,144,104
Shares of Class B Common Stock
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		37,379,889

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 32,503	$ 103,312
Accounts receivable—trade	248,160	153,589
Accounts receivable—related party	0	15,139
Unbilled revenue	98,221	79,233
Inventories	86,809	60,024
Prepaid and other current assets	20,332	49,924
Total current assets	486,025	461,221
Property and equipment, net	647,614	627,053
Other assets	33,570	28,227
Note receivable—related party	15,601	0
Finance lease right-of-use assets	59,422	0
Operating lease right-of-use assets	61,143	0
Total assets	1,303,375	1,116,501
Current liabilities:
Accounts payable	108,102	80,490
Accrued liabilities:
Accrued vendor invoices	75,120	67,771
Operational accruals	19,823	36,414
Accrued salaries and benefits	22,963	22,791
Accrued interest and other	9,590	9,585
Accrued liabilities—related party	0	2,300
Current portion of long-term debt, net of discount of $1,353 and $1,365, respectively	397	385
Current portion of finance lease liabilities	18,193	0
Current portion of operating lease liabilities	16,508	0
Total current liabilities	270,696	219,736
Long-term debt, net of discount of $3,153 and $3,826, respectively, less current portion	106,375	106,139
Deferred tax liability	33,915	32,994
Payable pursuant to tax receivable agreements	20,074	16,818
Noncurrent portion of finance lease liabilities	35,843	0
Noncurrent portion of operating lease liabilities	44,026	0
Total liabilities	510,929	375,687
Commitments & contingencies (Note 13)
Stockholders’ equity:
Preferred Stock, $0.01 par value, 10,000 shares authorized and none issued and outstanding	0	0
Common Stock:
Additional paid in capital	318,099	312,659
Retained earnings	152,322	119,274
Total stockholders’ equity	471,547	433,069
Noncontrolling interest	320,899	307,745
Total equity	792,446	740,814
Total liabilities and equity	1,303,375	1,116,501
Class A, $0.01 par value, 400,000,000 shares authorized and 68,962,200 issued and outstanding as of June 30, 2019 and 68,359,871 issued and outstanding as of December 31, 2018
Common Stock:
Common stock, par value $0.01	690	684
Class B, $0.01 par value, 400,000,000 shares authorized and 43,570,372 issued and outstanding as of June 30, 2019 and 45,207,372 issued and outstanding as of December 31, 2018
Common Stock:
Common stock, par value $0.01	$ 436	$ 452

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current portion of long-term debt, discount	$ 1,353	$ 1,365
Long-term debt, discount	$ 3,153	$ 3,826
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000	10,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Shares of Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 10
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	68,962,200	68,359,871
Common stock, shares outstanding (in shares)	68,962,200	68,359,871
Shares of Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	43,570,372	45,207,372
Common stock, shares outstanding (in shares)	43,570,372	45,207,372

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Revenue	$ 537,322	$ 628,084	$ 1,066,153	$ 1,119,182
Revenue—related parties	4,825	0	11,142	4,062
Total revenue	542,147	628,084	1,077,295	1,123,244
Operating costs and expenses:
Cost of services (exclusive of depreciation and amortization shown separately below)	426,444	455,469	855,743	832,296
General and administrative	23,989	27,313	46,077	48,990
Depreciation and amortization	40,368	30,606	78,755	58,622
Loss on disposal of assets	143	485	1,366	565
Total operating costs and expenses	490,944	513,873	981,941	940,473
Operating income	51,203	114,211	95,354	182,771
Other expense:
Interest expense	3,597	3,540	7,779	10,034
Net income before income taxes	47,606	110,671	87,575	172,737
Income tax expense	7,083	15,930	13,143	24,009
Net income	40,523	94,741	74,432	148,728
Less: Net income attributable to Predecessor, prior to Corporate Reorganization	0	0	0	8,705
Less: Net income attributable to noncontrolling interests	18,491	45,146	34,279	66,753
Net income attributable to Liberty Oilfield Services Inc. stockholders	$ 22,032	$ 49,595	$ 40,153	$ 73,270
Net income attributable to Liberty Oilfield Services Inc. stockholders per common share:
Basic (in dollars per share)	$ 0.32	$ 0.72	$ 0.59	$ 1.06
Diluted (in dollars per share)	$ 0.32	$ 0.71	$ 0.58	$ 1.05
Weighted average common shares outstanding:
Basic (in shares)	68,404	69,020	67,918	68,977
Diluted (in shares)	114,338	118,638	114,277	118,407

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Members’ Equity	Additional Paid in Capital	Retained Earnings	Total Stockholders’ equity	Noncontrolling Interest	Shares of Class A Common Stock	Shares of Class A Common StockCommon Stock	Shares of Class B Common Stock	Shares of Class B Common StockCommon Stock
Beginning Balance at Dec. 31, 2017		$ 392,766
Beginning balance (in shares) at Dec. 31, 2017								0		0
Beginning balance at Dec. 31, 2017	$ 392,766		$ 0	$ 0	$ 0	$ 0		$ 0		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Return on redeemable common units	(149)	(149)
Net income prior to Corporate Reorganization	8,705	8,705
Ending Balance at Jan. 17, 2018		401,322
Ending balance (in shares) at Jan. 17, 2018								0		0
Ending balance at Jan. 17, 2018	401,322		0	0	0	0		$ 0		$ 0
Beginning Balance at Dec. 31, 2017		392,766
Beginning balance (in shares) at Dec. 31, 2017								0		0
Beginning balance at Dec. 31, 2017	392,766		0	0	0	0		$ 0		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income prior to Corporate Reorganization	73,270
Ending Balance at Jun. 30, 2018		0
Ending balance (in shares) at Jun. 30, 2018								69,958,000		48,207,000
Ending balance at Jun. 30, 2018	739,496		349,488	73,270	423,940	315,556		$ 700		$ 482
Beginning Balance at Jan. 17, 2018		401,322
Beginning balance (in shares) at Jan. 17, 2018								0		0
Beginning balance at Jan. 17, 2018	401,322		0	0	0	0		$ 0		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of Liberty LLC Units for Class A Common Stock and Class B Common Stock and extinguishment of Redeemable Common Units (shares)								55,986,000		48,207,000
Exchange of Liberty LLC Units for Class A Common Stock and Class B Common Stock and extinguishment of Redeemable Common Units	46,544	(401,322)	446,824	0	447,866			$ 560		$ 482
Net deferred tax liability due to corporate reorganization	(28,620)		(28,620)		(28,620)
Issuance of Class A Common Stock, net of underwriter discount and offering costs (shares)								14,340,000
Issuance of Class A Common Stock, net of underwriter discount and offering costs	220,260		220,117		220,260			$ 143
Redemption of Legacy Ownership, net of underwriting discount (shares)								(1,609,000)
Redemption of legacy ownership, net of underwriter discount	(25,897)		(25,881)		(25,897)			$ (16)
Issuance of Restricted Stock (shares)								1,258,000
Issuance of Restricted Stock	0		(13)		0			$ 13
Liability due to tax receivable agreements	(2,291)		(2,291)		(2,291)
Initial allocation of noncontrolling interest of Liberty LLC effective on the date of the IPO	0		(261,844)		(261,844)	261,844
Distribution paid and payable to noncontrolling interest unitholders	(13,041)					(13,041)
Restricted stock forfeited (shares)								(17,000)
Restricted stock forfeited	0				0
Net income	140,023			73,270	73,270	66,753
Ending Balance at Jun. 30, 2018		0
Ending balance (in shares) at Jun. 30, 2018								69,958,000		48,207,000
Ending balance at Jun. 30, 2018	739,496		349,488	73,270	423,940	315,556		$ 700		$ 482
Beginning balance (in shares) at Mar. 31, 2018								69,971,000		48,207,000
Beginning balance at Mar. 31, 2018	650,920		347,965	23,675	372,822	278,098		$ 700		$ 482
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	1,196		1,196		1,196
Distribution paid and payable to noncontrolling interest unitholders	(7,688)					(7,688)
Restricted stock forfeited (shares)								(13,000)
Restricted stock forfeited	0				0
Net income prior to Corporate Reorganization	49,595
Net income	94,741			49,595	49,595	45,146
Ending Balance at Jun. 30, 2018		$ 0
Ending balance (in shares) at Jun. 30, 2018								69,958,000		48,207,000
Ending balance at Jun. 30, 2018	739,496		349,488	73,270	423,940	315,556		$ 700		$ 482
Beginning balance (in shares) at Dec. 31, 2018							68,359,871	68,360,000	45,207,372	45,207,000
Beginning balance at Dec. 31, 2018	740,814		312,659	119,274	433,069	307,745		$ 684		$ 452
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchanges of Class B Common Stock for Class A Common Stock (shares)								1,637,000		(1,637,000)
Exchanges of Class B Common Stock for Class A Common Stock	0		11,413		11,413	(11,413)		$ 16		$ (16)
Effect of exchange on deferred tax asset, net of liability under tax receivable agreements	896		896		896
$0.05/unit distribution to noncontrolling unitholders	(4,358)					(4,358)
Regular cash dividends declared and distributions paid	(7,107)			(7,107)	(7,107)
Share repurchase (shares)								(1,303,000)
Share repurchases	(17,098)		(13,017)		(13,030)	(4,068)		$ (13)
Stock based compensation expense	6,451		6,451		6,451
Vesting of restricted stock units (shares)								268,000
Vesting of restricted stock units	(1,039)		(303)		(300)	(739)		$ 3
Distribution paid and payable to noncontrolling interest unitholders	(547)					(547)
Restricted stock and RSU forfeitures	2			2	2
Net income prior to Corporate Reorganization	40,153
Net income	74,432			40,153	40,153	34,279
Ending balance (in shares) at Jun. 30, 2019							68,962,200	68,962,000	43,570,372	43,570,000
Ending balance at Jun. 30, 2019	792,446		318,099	152,322	471,547	320,899		$ 690		$ 436
Beginning balance (in shares) at Mar. 31, 2019								68,744,000		43,570,000
Beginning balance at Mar. 31, 2019	755,482		314,967	133,877	449,967	305,515		$ 687		$ 436
Increase (Decrease) in Stockholders' Equity [Roll Forward]
$0.05/unit distribution to noncontrolling unitholders	(2,179)					(2,179)
Regular cash dividends declared and distributions paid	(3,588)			(3,588)	(3,588)
Stock based compensation expense	3,571		3,571		3,571
Vesting of restricted stock units (shares)								(218,000)
Vesting of restricted stock units	(1,039)		(439)		(436)	(603)		$ 3
Distribution paid and payable to noncontrolling interest unitholders	(325)					(325)
Restricted stock and RSU forfeitures	1			1	1
Net income prior to Corporate Reorganization	22,032
Net income	40,523			22,032	22,032	18,491
Ending balance (in shares) at Jun. 30, 2019							68,962,200	68,962,000	43,570,372	43,570,000
Ending balance at Jun. 30, 2019	$ 792,446		$ 318,099	$ 152,322	$ 471,547	$ 320,899		$ 690		$ 436

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical)	Jun. 30, 2019$ / shares
Statement of Stockholders' Equity [Abstract]
Price per unit (in dollar per share)	$ 0.05

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 74,432	$ 148,728
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	78,755	58,622
Loss on disposal of assets	1,366	565
Interest expense on finance lease liability	1,350	0
Amortization of debt issuance costs	1,105	2,868
Inventory write-down	0	3,389
Non-cash lease expense	2,828	0
Share based compensation expense	6,451	1,196
Deferred income taxes	6,895	8,447
Changes in operating assets and liabilities:
Accounts receivable	(94,571)	(25,503)
Accounts receivable—related party	(462)	(122)
Unbilled revenue	(18,988)	(59,496)
Unbilled revenue—related party	0	59
Inventories	(26,785)	(10,239)
Other assets	18,151	(24,088)
Accounts payable and accrued liabilities	53,343	4,775
Accounts payable and accrued liabilities—related party	(1,000)	0
Payment of operating lease liability	(5,157)	0
Net cash provided by operating activities	97,713	109,201
Cash flows from investing activities:
Purchases of property and equipment and construction in-progress	(130,408)	(140,861)
Proceeds from sale of assets	344	3,018
Net cash used in investing activities	(130,064)	(137,843)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of underwriter discount	0	230,174
Redemption of Liberty LLC Units from legacy owners	0	(25,897)
Repayments of borrowings on term loan	(438)	(61,535)
Proceeds from Liberty Oilfield Services Holdings LLC	0	2,115
Repayments of borrowings on line-of-credit	0	(30,000)
Payments on finance lease obligations	(6,794)	0
Class A Common Stock dividend	(6,885)	0
Restricted Stock Vesting	(1,039)	0
Distribution to noncontrolling interest unitholders	(4,357)	(13,041)
Share buyback	(18,398)	0
Payment of deferred equity offering costs	0	(5,882)
Payments of debt issuance costs	0	(282)
Advance payments on TRAs	(547)	0
Net cash (used in) provided by financing activities	(38,458)	95,652
Net increase (decrease) in cash and cash equivalents	(70,809)	67,010
Cash and cash equivalents—beginning of period	103,312	16,321
Cash and cash equivalents—end of period	32,503	83,331
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,042	15,026
Cash paid for interest	5,575	7,555
Non-cash investing and financing activities:
Capital expenditures included in accounts payable and accrued liabilities	$ 10,353	$ 6,269

Organization and Basis of Prese

Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization Liberty Oilfield Services Inc. (the “Company”) was incorporated as a Delaware corporation on December 21, 2016, to become a holding corporation for Liberty Oilfield Services New HoldCo LLC (“Liberty LLC”) and its subsidiaries upon completion of a corporate reorganization (the “Corporate Reorganization”) and planned initial public offering of the Company (“IPO”). The Company has no material assets other than its ownership of units in Liberty LLC (“Liberty LLC Units”). Please refer to the Company’s 2018 Annual Report (the “Annual Report”) for additional information on the Corporate Reorganization and IPO that were completed on January 17, 2018. Prior to the Corporate Reorganization, Liberty Oilfield Services Holdings LLC (“Liberty Holdings”) wholly owned Liberty Oilfield Services LLC (“LOS”) and LOS Acquisition CO I LLC (“ACQI” and, together with LOS, the “Predecessor”). Following the Corporate Reorganization, Liberty LLC wholly owns the Predecessor. Effective March 22, 2018, the assets of ACQI were contributed into LOS and ACQI was dissolved. The Company, together with its subsidiaries, is a multi-basin provider of hydraulic fracturing services, with a focus on deploying the latest technologies in the technically demanding oil and gas reservoirs in which it operates, principally in North Dakota, Colorado, Wyoming and Texas. Basis of Presentation The accompanying unaudited condensed consolidated financial statements were prepared using generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and the instructions to Form 10-Q and Regulation S-X. Accordingly, these financial statements do not include all information or notes required by generally accepted accounting principles for annual financial statements and should be read together with the annual financial statements included in the Annual Report. The accompanying unaudited condensed consolidated financial statements and related notes present the condensed consolidated financial position, results of operations, cash flows, and equity of the Company as of and for the three and six months ended June 30, 2019 and the financial position, results of operations, cash flows, and equity of the Company as of December 31, 2018 and for the three and six months ended June 30, 2018 . The interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the results for the interim period. The results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of the results of operations expected for the entire fiscal year ended December 31, 2019 . All intercompany amounts have been eliminated in the presentation of the unaudited condensed consolidated financial statements of the Company. Comprehensive income is not reported due to the absence of items of other comprehensive income or loss during the periods presented. The condensed consolidated financial statements include financial data at historical cost as the contribution of assets is considered to be a reorganization of entities under common control. The condensed consolidated financial statements may not be indicative of the actual level of assets, liabilities and costs that would have been incurred by the Predecessor if it had operated as an independent, publicly-traded company during the periods prior to the IPO or of the costs expected to be incurred in the future. The condensed consolidated and combined financial statements for periods prior to January 17, 2018, reflect the historical results of the Predecessor. The condensed consolidated financial statements include the amounts of the Company and all majority owned subsidiaries where the Company has the ability to exercise control. The Company’s operations are organized into a single reportable segment, which consists of hydraulic fracturing services.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Recently Adopted Accounting Standards Leases On January 1, 2019, the Company adopted Accounting Standards Update (“ASU”) No. 2016-02, Leases (Accounting Standard Codification (“ASC”) Topic 842) , as amended by other ASUs issued since February 2016 (“ASU 2016-02” or “ASC Topic 842”), using the modified retrospective transition method applied at the effective date of the standard. By electing this optional transition method, information prior to January 1, 2019 has not been restated and continues to be reported under the accounting standards in effect for the period ( ASC Topic 840 ). The Company elected the package of practical expedients permitted under the transition guidance within the new standard, including the option to carry forward the historical lease classifications and assessment of initial direct costs, account for lease and non-lease components as a single lease, and to not include leases with an initial term of less than 12 months in the lease assets and liabilities. The adoption of ASC Topic 842 resulted in the recognition of finance lease right-of-use assets, operating lease right-of-use assets, and lease liabilities for finance and operating leases. As of January 1, 2019, the adoption of the new standard resulted in the recognition of finance lease assets of $57.2 million , including $2.1 million and $2.0 million reclassified from prepaid and other current assets and other assets, respectively, and finance lease liabilities of $53.2 million . Additionally, the Company recorded operating lease assets of $64.0 million , including $1.9 million reclassified from prepaid and other current assets, and operating lease liabilities of $63.6 million , including $1.5 million reclassified from accrued interest and other liabilities as of January 1, 2019. There was no significant impact to the condensed consolidated statements of income, equity or cash flows. Refer to Note 5-Leases for additional disclosures required under ASC Topic 842. For leases entered into after January 1, 2019, the Company determines if an arrangement is a lease at inception and evaluates identified leases for operating or finance lease treatment. Operating or finance lease right-of-use assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. The Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. Lease terms may include options to renew, however, the Company typically cannot determine its intent to renew a lease with reasonable certainty at inception. Revenue Recognition In connection with the adoption of ASC Topic 842, the Company determined that certain of its service revenue contracts contain a lease component. The Company elected to adopt a practical expedient available to lessors, which allows the Company to combine the lease and non-lease components and account for the combined component is accordance with the accounting treatment for the predominant component. Therefore, the Company combines the lease and service component for certain of the Company’s service contracts and continues to account for the combined component under ASC Topic 606, Revenue from Contracts with Customers. Recently Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which is effective for fiscal years and interim periods within fiscal years beginning after December 15, 2019, with a modified-retrospective approach to be used for implementation. ASU 2016-13 changes the impairment model for most financial assets and certain other instruments. Specifically, this new guidance requires using a forward looking, expected loss model for trade and other receivables, held-to-maturity debt securities, loans and other instruments. This will replace the currently used model and may result in an earlier recognition of allowance for losses. The Company is currently evaluating the impact of the adoption of this standard will have on its condensed consolidated financial statements. Fleet Start-up Costs The Company incurs start-up costs to commission a new fleet or district. These costs include hiring and training of personnel, and acquisition of consumable parts and tools. Start-up costs are expensed as incurred, and are reflected in general and administrative expenses in the statement of operations. Start-up costs for the three and six months ended June 30, 2019 were $0.4 million and $1.5 million , respectively. The Company deployed one fleet during the six months ended June 30, 2019 . Start-up costs for the three and six months ended June 30, 2018 were $3.3 million and $6.6 million , respectively, related to one and three new fleets deployed during each respective period. The total amount of start-up costs incurred for the commissioning of each new fleet depends primarily on the number and timing of hiring additional personnel to staff such fleets, and such costs may not be entirely incurred in the same period as the fleet is deployed. The terms and conditions of the Credit Facilities, defined herein, between the Company and its lenders provides for the add-back of costs or expenses incurred in connection with the acquisition, deployment and opening of any new hydraulic fracturing fleet or district in the computation of certain financial covenants (see Note 6).

Inventories

Inventories	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consist of the following: June 30, December 31, ($ in thousands) 2019 2018 Proppants $ 22,919 $ 22,038 Chemicals 12,780 10,781 Maintenance parts 51,110 27,205 $ 86,809 $ 60,024 During the three and six months ended June 30, 2019 , the Company did not record any write-down to inventory carrying values.

Property and Equipment

Property and Equipment	6 Months Ended
	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment consist of the following: Estimated June 30, December 31, ($ in thousands) 2019 2018 Land N/A $ 5,400 $ 5,400 Field services equipment 2-7 919,614 778,423 Vehicles 4-7 60,053 59,807 Buildings and facilities 5-30 28,197 27,795 Office equipment, furniture, and software 2-7 6,368 6,200 1,019,632 877,625 Less accumulated depreciation and amortization (377,288 ) (307,277 ) 642,344 570,348 Construction in-progress N/A 5,270 56,705 $ 647,614 $ 627,053 Depreciation expense for the three months ended June 30, 2019 and 2018 was $37.4 million and $30.6 million , respectively. During the six months ended June 30, 2019 and 2018 , the Company recognized depreciation expense of $73.1 million and $58.6 million , respectively.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leases The Company has operating and finance leases primarily for vehicles, equipment, railcars, office space, and facilities. The terms and conditions for these leases vary by the type of underlying asset. Certain leases include variable lease payments for items such as property taxes, insurance, maintenance, and other operating expenses associated with leased assets. Payments that vary based on an index or rate are included in the measurement of lease assets and liabilities at the rate as of the commencement date. All other variable lease payments are excluded from the measurement of lease assets and liabilities, and are recognized in the period in which the obligation for those payments is incurred. The components of lease expense for the three and six months ended June 30, 2019 were as follows: June 30, 2019 ($ in thousands) Three Months Ended Six Months Ended Finance lease cost: Amortization of right-of-use assets $ 2,611 $ 4,977 Interest on lease liabilities 699 1,350 Operating lease cost 5,053 10,264 Variable lease cost 603 1,607 Total lease cost $ 8,966 $ 18,198 Rent expense recorded for the three and six months ended June 30, 2018 was $9.4 million and $17.3 million , respectively. Supplemental cash flow and other information related to leases for the three and six months ended June 30, 2019 were as follows: June 30, 2019 ($ in thousands) Three Months Ended Six Months Ended Cash paid for amounts included in measurement of liabilities: Operating leases $ 2,752 $ 10,550 Finance leases 3,512 6,794 Right-of-use assets obtained in exchange for new lease liabilities: Operating leases 625 70,055 Finance leases 6,718 64,139 Lease terms and discount rates as of June 30, 2019 were as follows: June 30, 2019 Weighted-average remaining lease term: Operating leases 6.4 years Finance leases 1.8 years Weighted-average discount rate: Operating leases 5.4 % Finance leases 5.2 % Future minimum lease commitments as of June 30, 2019 are as follows: ($ in thousands) Finance Operating Remainder of 2019 $ 7,241 $ 9,679 2020 26,788 18,445 2021 20,395 13,584 2022 3,444 7,126 2023 — 4,245 Thereafter — 19,588 Total lease payments 57,868 72,667 Less imputed interest (3,832 ) (12,133 ) Total $ 54,036 $ 60,534 The Company’s vehicle leases typically include a residual value guarantee. For the Company’s vehicle leases classified as operating leases, the total residual value guaranteed as of June 30, 2019 is $3.1 million ; the payment is not probable and therefore has not been included in the measurement of the lease liability and right-of-use asset. For vehicle leases that are classified as financing leases, the Company includes the residual value guarantee in the financing lease liability. At December 31, 2018, future minimum lease payments under operating leases were as follows: ($ in thousands) Years Ending December 31, 2019 $ 42,717 2020 48,685 2021 32,390 2022 6,093 2023 4,303 Thereafter 19,742 $ 153,930
Leases	Leases The Company has operating and finance leases primarily for vehicles, equipment, railcars, office space, and facilities. The terms and conditions for these leases vary by the type of underlying asset. Certain leases include variable lease payments for items such as property taxes, insurance, maintenance, and other operating expenses associated with leased assets. Payments that vary based on an index or rate are included in the measurement of lease assets and liabilities at the rate as of the commencement date. All other variable lease payments are excluded from the measurement of lease assets and liabilities, and are recognized in the period in which the obligation for those payments is incurred. The components of lease expense for the three and six months ended June 30, 2019 were as follows: June 30, 2019 ($ in thousands) Three Months Ended Six Months Ended Finance lease cost: Amortization of right-of-use assets $ 2,611 $ 4,977 Interest on lease liabilities 699 1,350 Operating lease cost 5,053 10,264 Variable lease cost 603 1,607 Total lease cost $ 8,966 $ 18,198 Rent expense recorded for the three and six months ended June 30, 2018 was $9.4 million and $17.3 million , respectively. Supplemental cash flow and other information related to leases for the three and six months ended June 30, 2019 were as follows: June 30, 2019 ($ in thousands) Three Months Ended Six Months Ended Cash paid for amounts included in measurement of liabilities: Operating leases $ 2,752 $ 10,550 Finance leases 3,512 6,794 Right-of-use assets obtained in exchange for new lease liabilities: Operating leases 625 70,055 Finance leases 6,718 64,139 Lease terms and discount rates as of June 30, 2019 were as follows: June 30, 2019 Weighted-average remaining lease term: Operating leases 6.4 years Finance leases 1.8 years Weighted-average discount rate: Operating leases 5.4 % Finance leases 5.2 % Future minimum lease commitments as of June 30, 2019 are as follows: ($ in thousands) Finance Operating Remainder of 2019 $ 7,241 $ 9,679 2020 26,788 18,445 2021 20,395 13,584 2022 3,444 7,126 2023 — 4,245 Thereafter — 19,588 Total lease payments 57,868 72,667 Less imputed interest (3,832 ) (12,133 ) Total $ 54,036 $ 60,534 The Company’s vehicle leases typically include a residual value guarantee. For the Company’s vehicle leases classified as operating leases, the total residual value guaranteed as of June 30, 2019 is $3.1 million ; the payment is not probable and therefore has not been included in the measurement of the lease liability and right-of-use asset. For vehicle leases that are classified as financing leases, the Company includes the residual value guarantee in the financing lease liability. At December 31, 2018, future minimum lease payments under operating leases were as follows: ($ in thousands) Years Ending December 31, 2019 $ 42,717 2020 48,685 2021 32,390 2022 6,093 2023 4,303 Thereafter 19,742 $ 153,930

Debt

Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt	Debt Debt consists of the following: June 30, December 31, ($ in thousands) 2019 2018 Term Loan outstanding $ 111,278 $ 111,715 Deferred financing costs and original issue discount (4,506 ) (5,191 ) Total debt, net of deferred financing costs and original issue discount $ 106,772 $ 106,524 Current portion of long-term debt, net of discount $ 397 $ 385 Long-term debt, net of discount and current portion 106,375 106,139 $ 106,772 $ 106,524 The Company has two credit agreements in effect for a revolving line of credit up to $250.0 million (the “ABL Facility”) and a $175.0 million term loan (the “Term Loan Facility”, and together with the ABL Facility the “Credit Facilities”). Following is a description of the ABL Facility and the Term Loan Facility. ABL Facility Under the terms of the ABL Facility, up to $250.0 million may be borrowed, subject to certain borrowing base limitations based on a percentage of eligible accounts receivable and inventory. As of June 30, 2019 , the borrowing base was calculated to be $234.2 million , and the Company had no borrowings outstanding, except for a letter of credit in the amount of $0.3 million , with $233.9 million of remaining availability. The unused commitment fee is 0.375% to 0.5% of average monthly unused commitment. The ABL Facility matures on the earlier of (i) September 19, 2022 and (ii) to the extent the debt under the Term Loan Facility remains outstanding, 90 days prior to the final maturity of the Term Loan Facility, which matures on September 19, 2022. Term Loan Facility The Term Loan Facility provides for a $175.0 million term loan, of which $111.3 million remained outstanding as of June 30, 2019 . The rate on borrowing was 10.0% as of June 30, 2019 . The Company is required to make quarterly principal payments of 1% per annum of the initial principal balance, commencing on December 31, 2017, with final payment due at maturity on September 19, 2022. The Credit Facilities include certain non-financial covenants, including but not limited to restrictions on incurring additional debt and certain distributions. Moreover, the ability of the Company to incur additional debt and to make distributions is dependent on maintaining a maximum leverage ratio. The Term Loan Facility requires mandatory prepayments upon certain dispositions of property or issuance of other indebtedness, as defined, and annually a percentage of excess cash flow ( 25% to 50% , depending on leverage ratio, of consolidated net income less capital expenditures and other permitted payments, commencing with the year ending December 31, 2018). The Credit Facilities are not subject to financial covenants unless liquidity, as defined in the respective credit agreements, drops below a specified level. Under the ABL Facility, the Company is required to maintain a minimum fixed charge coverage ratio, as defined in the credit agreement governing the ABL Facility, of 1.0 to 1.0 for each period if excess availability is less than 10% of the borrowing base or $12.5 million , whichever is greater. Under the Term Loan Facility, the Company is required to maintain a minimum fixed charge coverage ratio, as defined, of 1.2 to 1.0 for each trailing twelve-month period if the Company’s liquidity, as defined, is less than $25.0 million for at least five consecutive business days. The Company was in compliance with these covenants as of June 30, 2019 . Maturities of debt are as follows: ($ in thousands) Remainder of 2019 $ 1,313 2020 1,750 2021 1,750 2022 106,465 2023 — $ 111,278

Fair Value Measurements and Fin

Fair Value Measurements and Financial Instruments	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements and Financial Instruments	Fair Value Measurements and Financial Instruments The fair values of the Company’s assets and liabilities represent the amounts that would be received to sell those assets or that would be paid to transfer those liabilities in an orderly transaction at the reporting date. These fair value measurements maximize the use of observable inputs. However, in situations where there is little, if any, market activity for the asset or liability at the measurement date, the fair value measurement reflects the Company’s own judgments about the assumptions that market participants would use in pricing the asset or liability. The Company discloses the fair values of its assets and liabilities according to the quality of valuation inputs under the following hierarchy: • Level 1 Inputs: Quoted prices (unadjusted) in an active market for identical assets or liabilities. • Level 2 Inputs: Inputs other than quoted prices that are directly or indirectly observable. • Level 3 Inputs: Unobservable inputs that are significant to the fair value of assets or liabilities. The classification of an asset or liability is based on the lowest level of input significant to its fair value. Those that are initially classified as Level 3 are subsequently reported as Level 2 when the fair value derived from unobservable inputs is inconsequential to the overall fair value, or if corroborating market data becomes available. Assets and liabilities that are initially reported as Level 2 are subsequently reported as Level 3 if corroborating market data is no longer available. Transfers occur at the end of the reporting period. There were no transfers into or out of Levels 1, 2 and 3 during the six months ended June 30, 2019 and 2018 . The Company’s financial instruments consist of cash and cash equivalents, accounts receivable, notes receivable, accounts payable, accrued liabilities, long-term debt, and finance and operating lease obligations. These financial instruments do not require disclosure by level. The carrying values of all the Company’s financial instruments included in the accompanying condensed consolidated balance sheets approximated or equaled their fair values at June 30, 2019 and December 31, 2018 . • The carrying values of cash and cash equivalents, accounts receivable and accounts payable (including accrued liabilities) approximated fair value at June 30, 2019 and December 31, 2018 , due to their short-term nature. • The carrying value of amounts outstanding under long-term debt agreements with variable rates approximated fair value at June 30, 2019 and December 31, 2018 , as the effective interest rates approximated market rates. Nonfinancial assets The Company estimates fair value to perform impairment tests as required on long-lived assets. The inputs used to determine such fair value are primarily based upon internally developed cash flow models and would generally be classified within Level 3 in the event that such assets were required to be measured and recorded at fair value within the financial statements. There were no such measurements required as of June 30, 2019 and December 31, 2018 . Credit Risk The Company’s financial instruments exposed to concentrations of credit risk consist primarily of cash and cash equivalents, and trade receivables. The Company’s cash balances on deposit with financial institutions total $32.5 million and $103.3 million as of June 30, 2019 and December 31, 2018 , respectively, which exceeded FDIC insured limits. The Company regularly monitors these institutions’ financial condition. The majority of the Company’s customers have stated payment terms of 45 days or less. As of June 30, 2019 and December 31, 2018 , customers A and B accounted for 23% and customers B and C accounted for 28% of total accounts receivable and unbilled revenue, respectively. The Company mitigates the associated credit risk by performing credit evaluations and monitoring the payment patterns of its customers. During the three months ended June 30, 2019 , no customers accounted for more than 10% of total revenue, and during the three months ended June 30, 2018 , customer A accounted for 15% of total revenue. During the six months ended June 30, 2019 and 2018 , customer D accounted for 10% and customer A accounted for 16% of total revenue, respectively. As of June 30, 2019 and December 31, 2018 , the Company had no provision for doubtful accounts.

Equity

Equity	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Equity	Equity Preferred Stock As of June 30, 2019 , the Company had 10,000 shares of preferred stock authorized, par value $0.01 , with none issued and outstanding. If issued, each class or series of preferred stock will cover the number of shares and will have the powers, preferences, rights, qualifications, limitations and restrictions determined by the Company ’ s board of directors, which may include, among others, dividend rights, liquidation preferences, voting rights, conversion rights, preemptive rights and redemption rights. Except as provided by law or in a preferred stock designation, the holders of preferred stock will not be entitled to vote at or receive notice of any meeting of stockholders. Class A Common Stock The Company had a total of 68,962,200 shares of Class A Common Stock outstanding as of June 30, 2019 , which includes 555,713 shares of unvested restricted stock. Holders of Class A Common Stock are entitled to one vote per share on all matters to be voted upon by the stockholders and are entitled to ratably receive dividends when and if declared by the Company’s board of directors. Class B Common Stock The Company had a total of 43,570,372 shares of Class B Common Stock outstanding as of June 30, 2019 . Holders of the Class B Common Stock are entitled to one vote per share on all matters to be voted upon by stockholders. Holders of Class A Common Stock and Class B Common Stock vote together as a single class on all matters presented to the Company’s stockholders for their vote or approval, except with respect to amendment of certain provisions of the Company’s certificate of incorporation that would alter or change the powers, preferences or special rights of the Class B Common Stock so as to affect them adversely, which amendments must be by a majority of the votes entitled to be cast by the holders of the shares affected by the amendment, voting as a separate class, or as otherwise required by applicable law. Restricted Stock Awards Restricted stock awards are awards of Class A Common Stock that are subject to restrictions on transfer and to a risk of forfeitures if the award recipient is no longer an employee or director of the Company for any reason prior to the lapse of the restrictions. The following table summarizes the Company’s unvested restricted stock activity for the six months ended June 30, 2019 : Number of Shares Grant Date Fair Value per Share (1) Outstanding at December 31, 2018 634,653 $ — Vested (78,940 ) — Forfeited — — Outstanding at June 30, 2019 555,713 $ — (1) Prior to the IPO and Corporate Reorganization, Liberty Holdings issued Class B units of Liberty Holdings (“Legacy Units”). The Legacy Units were determined to have a de minimis grant-date fair value based on their assigned benchmark values. In connection with the Corporate Reorganization, the unvested Legacy Units were exchanged for 1,258,514 shares of restricted stock with the same terms and requisite vesting conditions. The shares of restricted stock retain the grant date fair value of the Legacy Units. Restricted Stock Units Restricted stock units (“RSUs”) granted pursuant to the Long Term Incentive Plan (“LTIP”), if they vest, will be settled in shares of the Company’s Class A Common Stock. RSUs were granted with vesting terms up to five years. Changes in non-vested RSUs outstanding under the LTIP during the six months ended June 30, 2019 were as follows: Number of Units Weighted Average Grant Date Fair Value per Unit Non-vested as of December 31, 2018 1,193,683 $ 19.24 Granted 877,732 15.09 Vested (327,799 ) 19.97 Forfeited (13,029 ) 19.12 Outstanding at June 30, 2019 1,730,587 $ 17.00 Performance Restricted Stock Units Performance restricted stock units (“PSUs”) granted pursuant to the LTIP, if they vest, will be settled in shares of the Company’s Class A Common Stock. PSUs were granted with a three year cliff vesting schedule, subject to a performance target compared to an index of competitors ’ results over the three year period from January 1, 2019 through December 31, 2021. The Company records compensation expense based on the Company’s best estimate of the number of PSUs that will vest at the end of the performance period. If such performance targets are not met, or are not expected to be met, no compensation expense is recognized and any recognized compensation expense is reversed. Changes in non-vested PSUs outstanding under the LTIP during the six months ended June 30, 2019 were as follows: Number of Units Weighted Average Grant Date Fair Value per Unit Non-vested as of December 31, 2018 — $ — Granted 356,908 14.93 Vested — — Forfeited — — Outstanding at June 30, 2019 356,908 $ 14.93 Stock-based compensation is included in cost of services and general and administrative expenses in the Company’s condensed consolidated statements of income. The Company recognized stock based compensation expense of $3.6 million and $6.5 million for the three and six months ended June 30, 2019 . The Company recognized stock based compensation expense of $1.2 million in the three and six months ended June 30, 2018 . There was approximately $29.3 million of unrecognized compensation expense relating to outstanding RSUs and PSUs as of June 30, 2019 . The unrecognized compensation expense will be recognized on a straight-line basis over the weighted average remaining vesting period of 2.3 years. Dividends The Company paid quarterly cash dividends of $0.05 per share of Class A Common Stock on March 20 and June 20, 2019 to stockholders of record as of March 6 and June 6, 2019, respectively. During the six months ended June 30, 2019 Liberty LLC paid distributions of $11.2 million , or $0.05 per Liberty LLC Unit, to all holders of Liberty LLC Units as of the dates above, $6.9 million of which was paid to the Company. The Company used the proceeds of the distributions to pay the dividends to all holders of shares of Class A Common Stock as of March 6 and June 6, 2019, which totaled $6.9 million . Additionally, the Company accrued $0.2 million of dividends payable related to restricted shares and RSUs to be paid upon vesting. Dividends related to forfeited restricted shares and RSUs will be forfeited. Share Repurchase Program On September 10, 2018 the Company’s board of directors authorized a share repurchase plan to repurchase up to $100.0 million of the Company’s Class A Common Stock through September 30, 2019. On January 22, 2019, the Company’s board of directors authorized an additional $100.0 million under the share repurchase plan through January 31, 2021. During the six months ended June 30, 2019 , Liberty LLC purchased and retired 1,303,003 Liberty LLC Units from the Company for $18.4 million , and the Company repurchased and retired 1,303,003 shares of Class A Common Stock for $18.4 million , or $14.66 average price per share. The repurchase in January completed the share repurchase amount authorized on September 10, 2018. Of the total amount of Class A Common Stock repurchased, 117,647 shares were repurchased or returned from R/C Energy IV Direct Partnership, L.P., R/C IV Liberty Holdings, L.P. and Riverstone/Carlyle Energy Partners IV, L.P. (“R/C” and collectively, the “Riverstone Sellers”). For further details of this related party transaction see Note 12. As of June 30, 2019 , $98.7 million remains authorized for future repurchases of Class A Common Stock under the share repurchase program.

Net Income per Share

Net Income per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Net Income per Share	Net Income per Share Basic net income per share measures the performance of an entity over the reporting period. Diluted net income per share measures the performance of an entity over the reporting period while giving effect to all potentially dilutive common shares that were outstanding during the period. The Company uses the “if-converted” method to determine the potential dilutive effect of its Class B Common Stock and the treasury stock method to determine the potential dilutive effect of outstanding restricted stock and restricted stock units. The following table reflects the allocation of net income to common stockholders and net income per share computations for the periods indicated based on a weighted average number of common stock outstanding for periods subsequent to the Corporate Reorganization on January 17, 2018: Three Months Ended Six Months Ended (In thousands) June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Basic Net Income Per Share Numerator: Net income attributable to Liberty Oilfield Services Inc. stockholders $ 22,032 $ 49,595 $ 40,153 $ 73,270 Denominator: Basic weighted average shares outstanding 68,404 69,020 67,918 68,977 Basic net income per share attributable to Liberty Oilfield Services Inc. stockholders $ 0.32 $ 0.72 $ 0.59 $ 1.06 Diluted Net Income Per Share Numerator: Net income attributable to Liberty Oilfield Services Inc. stockholders $ 22,032 $ 49,595 $ 40,153 $ 73,270 Effect of exchange of the shares of Class B Common Stock for shares of Class A Common Stock 13,992 34,171 25,825 50,482 Diluted net income attributable to Liberty Oilfield Services Inc. stockholders $ 36,024 $ 83,766 $ 65,978 $ 123,752 Denominator: Basic weighted average shares outstanding 68,404 69,020 67,918 68,977 Effect of dilutive securities: Restricted stock 556 948 578 994 Restricted stock units 1,808 463 1,717 229 Class B Common Stock 43,570 48,207 44,064 48,207 Diluted weighted average shares outstanding 114,338 118,638 114,277 118,407 Diluted net income per share attributable to Liberty Oilfield Services Inc. stockholders $ 0.32 $ 0.71 $ 0.58 $ 1.05

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is a corporation and is subject to U.S. federal, state and local income tax on its share of Liberty LLC’s taxable income. The effective combined U.S. federal and state income tax rate applicable to the Company for the six months ended June 30, 2019 was 15.0% , compared to 13.9% for the period ended June 30, 2018 commencing on January 17, 2018, the date of the Corporate Reorganization. The Company’s effective tax rate is significantly less than the statutory federal tax rate of 21.0% primarily because no taxes are payable by the Company for the noncontrolling interest’s share of Liberty LLC’s pass through results for federal, state and local income tax reporting. The Company’s effective tax rate is lower for the period ended June 30, 2018 , the shortened taxable period as the Company was a pass-through entity prior to the IPO. The Company recognized income tax expense of $7.1 million and $13.1 million during the three and six months ended June 30, 2019 , respectively, compared to $15.9 million during the three months ended June 30, 2018 , and $24.0 million for the period commencing on January 17, 2018, the date of the Corporate Reorganization, through June 30, 2018 . Tax Receivable Agreements In connection with the IPO, on January 17, 2018, the Company entered into two Tax Receivable Agreements (the “TRAs”) with R/C Energy IV Direct Partnership, L.P. and the then existing owners that continued to own Liberty LLC Units (each such person and any permitted transferee, a “TRA Holder” and together, the “TRA Holders”). The TRAs generally provide for the payment by the Company of 85% of the net cash savings, if any, in U.S. federal, state, and local income tax and franchise tax (computed using simplifying assumptions to address the impact of state and local taxes) that the Company actually realizes (or is deemed to realize in certain circumstances) in periods after the IPO as a result, as applicable to each TRA Holder, of (i) certain increases in tax basis that occur as a result of the Company’s acquisition (or deemed acquisition for U.S. federal income tax purposes) of all or a portion of such TRA Holder’s Liberty LLC Units in connection with the IPO or pursuant to the exercise of redemption or call rights, (ii) any net operating losses available to the Company as a result of the Corporate Reorganization, and (iii) imputed interest deemed to be paid by the Company as a result of, and additional tax basis arising from, any payments the Company makes under the TRAs. During the six months ended June 30, 2019 , redemptions of Liberty LLC Units and shares of Class B Common Stock resulted in an increase of $5.1 million in amounts payable under the TRAs, and a net increase of $6.0 million in deferred tax assets, all of which were recorded through equity. At June 30, 2019 , the Company ’ s liability under the TRA was $21.9 million , a portion of which is presented as a component of current liabilities of $1.8 million and a portion of which is presented as a component of long term liabilities of $20.1 million , and the related deferred tax assets totaled $25.8 million .

Defined Contribution Plan

Defined Contribution Plan	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Defined Contribution Plan	Defined Contribution Plan The Company sponsors a 401(k) defined contribution retirement plan covering eligible employees. The Company makes matching contributions at a rate of $1.00 for each $1.00 of employee contribution, subject to a cap of 6% of the employee’s salary. Contributions made by the Company were $8.0 million and $6.7 million for the six months ended June 30, 2019 and 2018 , respectively, and $3.9 million and $3.4 million for the three months ended June 30, 2019 and 2018 , respectively.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments & Contingencies Purchase Commitments (tons and gallons are not in thousands) The Company enters into purchase and supply agreements to secure supply and pricing of proppants and chemicals. As of June 30, 2019 and December 31, 2018 , the agreements commit the Company to purchase 9,694,350 and 11,266,000 tons, respectively, of proppant through December 31, 2021. Amounts above also include commitments to pay for transport fees on minimum amounts of proppants or railcars. Certain proppant supply agreements contain a clause whereby in the event that the Company fails to purchase minimum volumes, as defined in the agreement, during a specific time period, a shortfall fee may apply. There were no shortfalls as of June 30, 2019 . As of June 30, 2019 and December 31, 2018 , the Company had commitments to purchase 14,139,000 and 18,852,000 gallons of chemicals through December 31, 2020. Future proppant, including rail car transport, and chemical commitments are as follows: ($ in thousands) Remainder of 2019 $ 172,404 2020 261,984 2021 108,826 2022 3,433 2023 — $ 546,647 Litigation The Company is subject to legal proceedings, claims and litigation arising in the ordinary course of business. While the outcome of these matters is currently undeterminable, the Company does not expect that the ultimate costs to resolve these matters will have a material adverse effect on its condensed consolidated financial position or results of operations.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions During January 2019, the Company repurchased 117,647 shares of Class A Common Stock from the Riverstone Sellers, at a weighted average purchase price of $17.00 per share, pursuant to the share repurchase program (see Note 8 - Equity - Share Repurchase Program ). In connection with the Corporate Reorganization, the Company engaged in transactions with affiliates including entering into the TRAs with affiliates (see Note 10). Also in conjunction with the Corporate Reorganization, Liberty Holdings contributed $2.1 million of assets to Liberty LLC and Redeemable Common Units in the amount of $42.6 million were settled. In September 2011, Liberty Resources LLC, an oil and gas exploration and production company, and its successor entity (collectively, the “Affiliate”) and LOS, companies with common ownership and management, entered into a services agreement (the “Services Agreement”) whereby the Affiliate was to provide certain administrative support functions to LOS and a master service agreement whereby LOS provides hydraulic fracturing services to the Affiliate at market service rates. The Services Agreement was terminated during June 2018. The amounts of the Company’s revenue related to hydraulic fracturing services provided to the Affiliate for the three months ended June 30, 2019 and 2018 was $4.8 million and $0 , respectively, and $11.1 million and $3.9 million for the six months ended June 30, 2019 and 2018 , respectively. As of June 30, 2019 and December 31, 2018 , $0 and $15.1 million , respectively, of the Company’s accounts receivable was with the Affiliate. The Company had no unbilled revenue with the Affiliate as of June 30, 2019 and December 31, 2018 . On June 24, 2019 (the “Agreement Date”), the Company entered into an agreement with the Affiliate to amend payment terms for outstanding invoices due as of the Agreement Date to be due on July 31, 2020. Amounts outstanding from the Affiliate as of the Agreement Date were $15.6 million , which are presented as a note receivable-related party in the accompanying condensed consolidated balance sheet as of June 30, 2019. The balance outstanding as of the Agreement Date is subject to interest at 13% annual percent yield, retroactively applied to the respective invoice date. During the three and six months ended and as of June 30, 2019, interest income and accrued interest due from the Affiliate were each $0.7 million . Receivables earned for services performed after the Agreement Date will continue to be subject to normal 30-day payment terms. Liberty Holdings entered into an advisory agreement dated December 30, 2011 with R/C, in which R/C agreed to provide certain administrative advisory services to Liberty Holdings. The Company incurred no service fees during the three and six months ended June 30, 2019 and 2018 , and fees accrued as of June 30, 2019 and December 31, 2018 were $0 and $2.3 million , respectively. The advisory services agreement was terminated pursuant to an agreement effective as of January 11, 2018. On January 11, 2018, Liberty Holdings, R/C and other parties entered into a Master Reorganization Agreement that, among other things, crystallized the “waterfall” provisions of Article VI of the Third Amended and Restated Limited Liability Agreement of Liberty Holdings, dated October 11, 2016 (the “Holdings LLC Agreement”) in connection with the IPO. As part of this crystallization, R/C and affiliated entities (collectively, the “R/C Affiliates”) received shares of Class A Common Stock, including 117,647 shares of Class A Common Stock (such 117,647 shares referred to as the “Issued Shares”) to compensate R/C Affiliates for certain accrued preferred returns but which would not have been issued had the $2.0 million in fees owed under the advisory agreement been paid in cash. Had this fee been paid in cash on or prior to January 11, 2018, R/C and Liberty Holdings acknowledge that R/C Affiliates would not have received the Issued Shares in the crystallization pursuant to the provisions of the Holdings LLC Agreement. Subsequently, during the fourth quarter of 2018, R/C asserted that certain provisions of the termination of services agreement provided for R/C to receive $2.0 million in cash as payment of those accrued fees. To resolve this matter, the Company agreed to pay R/C Affiliates $2.0 million in cash in exchange for the purchase, at the IPO price, or return of the Issued Shares and $0.3 million for interest and the settlement of the matter. Accordingly, $2.3 million was recorded as accrued liabilities - related party in the accompanying condensed consolidated balance sheet as of December 31, 2018 and subsequently paid in January 2019. The purchased and returned shares of Class A Common Stock were canceled and retired, and the Company does not expect to incur future expense related to the advisory agreement or termination thereof. During 2016, Liberty Holdings entered into a future commitment to invest and become a noncontrolling minority member in Proppant Express Investments, LLC, the owner of Proppant Express Solutions, LLC (“PropX”), a provider of proppant logistics equipment. LOS was party to a services agreement (the “PropX Services Agreement”) whereby LOS was to provide certain administrative support functions to PropX, and LOS is to purchase and lease proppant logistics equipment from PropX. The PropX Services Agreement was terminated on May 29, 2018, however the Company continues to purchase and lease equipment from PropX. During the three months ended June 30, 2019 and 2018 , the Company made $0 purchases of proppant logistics equipment and leased proppant logistics equipment for $2.4 million and $1.1 million , respectively. During the six months ended June 30, 2019 and 2018 , the Company purchased proppant logistics equipment of $0 and $2.1 million , respectively, and incurred lease expenses of $4.9 million and $2.7 million , respectively. During the three months ended March 31, 2018, in exchange for a 5% discount, the Company made a prepayment to PropX for rented equipment in the amount of $5.4 million , all of which was recognized in the year ended December 31, 2018 . The Company made an additional $4.2 million prepayment, in exchange for a 5% discount, during the three months ended March 31, 2019, all of which was recognized in the six months ended June 30, 2019. Receivables from PropX as of June 30, 2019 and December 31, 2018 were $0 . Payables to PropX as of June 30, 2019 and December 31, 2018 were $0.1 million and $0.2 million , respectively.

Selected Quarterly Financial Da

Selected Quarterly Financial Data (unaudited)	6 Months Ended
	Jun. 30, 2019
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (unaudited)	Selected Quarterly Financial Data The following tables summarizes consolidated changes in equity for the three months ended June 30, 2019 and 2018 : Shares of Class A Common Stock Shares of Class B Common Stock Class A Common Stock, Par Value Class B Common Stock, Par Value Additional Paid in Capital Retained Earnings Total Stockholders ’ equity Noncontrolling Interest Total Equity Balance—March 31, 2019 68,744 43,570 $ 687 $ 436 $ 314,967 $ 133,877 $ 449,967 $ 305,515 $ 755,482 Distributions paid and payable to noncontrolling unitholders — — — — — — — (325 ) (325 ) $0.05/unit Distribution to noncontrolling unitholders — — — — — — — (2,179 ) (2,179 ) Restricted stock and RSU forfeitures — — — — — 1 1 — 1 Stock based compensation expense — — — — 3,571 — 3,571 — 3,571 Regular cash dividends declared and distributions paid — — — — — (3,588 ) (3,588 ) — (3,588 ) RSU Vesting 218 — 3 — (439 ) — (436 ) (603 ) (1,039 ) Net income — — — — — 22,032 22,032 18,491 40,523 Balance—June 30, 2019 68,962 43,570 $ 690 $ 436 $ 318,099 $ 152,322 $ 471,547 $ 320,899 $ 792,446 Shares of Class A Common Stock Shares of Class B Common Stock Class A Common Stock, Par Value Class B Common Stock, Par Value Additional Paid in Capital Retained Earnings Total Stockholders ’ equity Noncontrolling Interest Total Equity Balance—March 31, 2018 69,971 48,207 $ 700 $ 482 $ 347,965 $ 23,675 $ 372,822 $ 278,098 $ 650,920 Distribution paid and payable to non-controlling interest unitholders — — — — — — — (7,688 ) (7,688 ) Offering costs for Issuance of Class A Common Stock — — — — 327 — 327 — 327 Stock based compensation expense — — — — 1,196 — 1,196 — 1,196 Restricted stock forfeited (13 ) — — — — — — — — Net income — — — — — 49,595 49,595 45,146 94,741 Balance—June 30, 2018 69,958 48,207 $ 700 $ 482 $ 349,488 $ 73,270 $ 423,940 $ 315,556 $ 739,496

Subsequent Event

Subsequent Event	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 23, 2019, the Company ’ s board of directors approved a quarterly dividend of $0.05 per share of Class A Common Stock, and a distribution of $0.05 per Liberty LLC Unit, to be paid on September 20, 2019 to holders of record as of September 6, 2019. The Company will use the proceeds from the Liberty LLC distribution to pay the dividend. During July 2019, certain Liberty LLC Unitholders exercised their redemption rights and redeemed 6,190,483 Liberty LLC Units (and an equivalent number of shares of Class B Common Stock) for 6,190,483 shares of Class A Common Stock of the Company. This exchange resulted in an increase to the ownership percentage of Liberty LLC owned by the Company. The Company expects to record a decrease to the Company ’ s deferred tax liability as a result. In addition, the Company expects to record an increase to the payable pursuant to the TRAs.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements were prepared using generally accepted accounting principles in the United States of America (“GAAP”) for interim financial information and the instructions to Form 10-Q and Regulation S-X. Accordingly, these financial statements do not include all information or notes required by generally accepted accounting principles for annual financial statements and should be read together with the annual financial statements included in the Annual Report. The accompanying unaudited condensed consolidated financial statements and related notes present the condensed consolidated financial position, results of operations, cash flows, and equity of the Company as of and for the three and six months ended June 30, 2019 and the financial position, results of operations, cash flows, and equity of the Company as of December 31, 2018 and for the three and six months ended June 30, 2018 . The interim data includes all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the results for the interim period. The results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of the results of operations expected for the entire fiscal year ended December 31, 2019 .
Leases	Leases On January 1, 2019, the Company adopted Accounting Standards Update (“ASU”) No. 2016-02, Leases (Accounting Standard Codification (“ASC”) Topic 842) , as amended by other ASUs issued since February 2016 (“ASU 2016-02” or “ASC Topic 842”), using the modified retrospective transition method applied at the effective date of the standard. By electing this optional transition method, information prior to January 1, 2019 has not been restated and continues to be reported under the accounting standards in effect for the period ( ASC Topic 840 ). The Company elected the package of practical expedients permitted under the transition guidance within the new standard, including the option to carry forward the historical lease classifications and assessment of initial direct costs, account for lease and non-lease components as a single lease, and to not include leases with an initial term of less than 12 months in the lease assets and liabilities. The adoption of ASC Topic 842 resulted in the recognition of finance lease right-of-use assets, operating lease right-of-use assets, and lease liabilities for finance and operating leases. As of January 1, 2019, the adoption of the new standard resulted in the recognition of finance lease assets of $57.2 million , including $2.1 million and $2.0 million reclassified from prepaid and other current assets and other assets, respectively, and finance lease liabilities of $53.2 million . Additionally, the Company recorded operating lease assets of $64.0 million , including $1.9 million reclassified from prepaid and other current assets, and operating lease liabilities of $63.6 million , including $1.5 million reclassified from accrued interest and other liabilities as of January 1, 2019. There was no significant impact to the condensed consolidated statements of income, equity or cash flows. Refer to Note 5-Leases for additional disclosures required under ASC Topic 842. For leases entered into after January 1, 2019, the Company determines if an arrangement is a lease at inception and evaluates identified leases for operating or finance lease treatment. Operating or finance lease right-of-use assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. The Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments.
Revenue Recognition	Revenue Recognition In connection with the adoption of ASC Topic 842, the Company determined that certain of its service revenue contracts contain a lease component. The Company elected to adopt a practical expedient available to lessors, which allows the Company to combine the lease and non-lease components and account for the combined component is accordance with the accounting treatment for the predominant component. Therefore, the Company combines the lease and service component for certain of the Company’s service contracts and continues to account for the combined component under ASC Topic 606
Fleet Start-up Costs	Fleet Start-up Costs The Company incurs start-up costs to commission a new fleet or district. These costs include hiring and training of personnel, and acquisition of consumable parts and tools. Start-up costs are expensed as incurred, and are reflected in general and administrative expenses in the statement of operations. Start-up costs for the three and six months ended June 30, 2019 were $0.4 million and $1.5 million , respectively. The Company deployed one fleet during the six months ended June 30, 2019 . Start-up costs for the three and six months ended June 30, 2018 were $3.3 million and $6.6 million , respectively, related to one and three new fleets deployed during each respective period. The total amount of start-up costs incurred for the commissioning of each new fleet depends primarily on the number and timing of hiring additional personnel to staff such fleets, and such costs may not be entirely incurred in the same period as the fleet is deployed. The terms and conditions of the Credit Facilities, defined herein, between the Company and its lenders provides for the add-back of costs or expenses incurred in connection with the acquisition, deployment and opening of any new hydraulic fracturing fleet or district in the computation of certain financial covenants
Recently Issued Accounting Standards	Recently Issued Accounting Standards In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which is effective for fiscal years and interim periods within fiscal years beginning after December 15, 2019, with a modified-retrospective approach to be used for implementation. ASU 2016-13 changes the impairment model for most financial assets and certain other instruments. Specifically, this new guidance requires using a forward looking, expected loss model for trade and other receivables, held-to-maturity debt securities, loans and other instruments. This will replace the currently used model and may result in an earlier recognition of allowance for losses. The Company is currently evaluating the impact of the adoption of this standard will have on its condensed consolidated financial statements.

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consist of the following: June 30, December 31, ($ in thousands) 2019 2018 Proppants $ 22,919 $ 22,038 Chemicals 12,780 10,781 Maintenance parts 51,110 27,205 $ 86,809 $ 60,024

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and equipment consist of the following: Estimated June 30, December 31, ($ in thousands) 2019 2018 Land N/A $ 5,400 $ 5,400 Field services equipment 2-7 919,614 778,423 Vehicles 4-7 60,053 59,807 Buildings and facilities 5-30 28,197 27,795 Office equipment, furniture, and software 2-7 6,368 6,200 1,019,632 877,625 Less accumulated depreciation and amortization (377,288 ) (307,277 ) 642,344 570,348 Construction in-progress N/A 5,270 56,705 $ 647,614 $ 627,053

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lease, Cost	Supplemental cash flow and other information related to leases for the three and six months ended June 30, 2019 were as follows: June 30, 2019 ($ in thousands) Three Months Ended Six Months Ended Cash paid for amounts included in measurement of liabilities: Operating leases $ 2,752 $ 10,550 Finance leases 3,512 6,794 Right-of-use assets obtained in exchange for new lease liabilities: Operating leases 625 70,055 Finance leases 6,718 64,139 The components of lease expense for the three and six months ended June 30, 2019 were as follows: June 30, 2019 ($ in thousands) Three Months Ended Six Months Ended Finance lease cost: Amortization of right-of-use assets $ 2,611 $ 4,977 Interest on lease liabilities 699 1,350 Operating lease cost 5,053 10,264 Variable lease cost 603 1,607 Total lease cost $ 8,966 $ 18,198
Lease Term And Discount Rate, Lessee	Lease terms and discount rates as of June 30, 2019 were as follows: June 30, 2019 Weighted-average remaining lease term: Operating leases 6.4 years Finance leases 1.8 years Weighted-average discount rate: Operating leases 5.4 % Finance leases 5.2 %
Lessee, Operating Lease, Liability, Maturity	Future minimum lease commitments as of June 30, 2019 are as follows: ($ in thousands) Finance Operating Remainder of 2019 $ 7,241 $ 9,679 2020 26,788 18,445 2021 20,395 13,584 2022 3,444 7,126 2023 — 4,245 Thereafter — 19,588 Total lease payments 57,868 72,667 Less imputed interest (3,832 ) (12,133 ) Total $ 54,036 $ 60,534
Finance Lease, Liability, Maturity	($ in thousands) Finance Operating Remainder of 2019 $ 7,241 $ 9,679 2020 26,788 18,445 2021 20,395 13,584 2022 3,444 7,126 2023 — 4,245 Thereafter — 19,588 Total lease payments 57,868 72,667 Less imputed interest (3,832 ) (12,133 ) Total $ 54,036 $ 60,534
Schedule of Future Minimum Rental Payments for Operating Leases	At December 31, 2018, future minimum lease payments under operating leases were as follows: ($ in thousands) Years Ending December 31, 2019 $ 42,717 2020 48,685 2021 32,390 2022 6,093 2023 4,303 Thereafter 19,742 $ 153,930

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule of Debt	Debt consists of the following: June 30, December 31, ($ in thousands) 2019 2018 Term Loan outstanding $ 111,278 $ 111,715 Deferred financing costs and original issue discount (4,506 ) (5,191 ) Total debt, net of deferred financing costs and original issue discount $ 106,772 $ 106,524 Current portion of long-term debt, net of discount $ 397 $ 385 Long-term debt, net of discount and current portion 106,375 106,139 $ 106,772 $ 106,524
Schedule of Maturities of Long-term Debt	Maturities of debt are as follows: ($ in thousands) Remainder of 2019 $ 1,313 2020 1,750 2021 1,750 2022 106,465 2023 — $ 111,278

Equity (Tables)

Equity (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Nonvested Restricted Stock Shares Activity	The following table summarizes the Company’s unvested restricted stock activity for the six months ended June 30, 2019 : Number of Shares Grant Date Fair Value per Share (1) Outstanding at December 31, 2018 634,653 $ — Vested (78,940 ) — Forfeited — — Outstanding at June 30, 2019 555,713 $ — (1) Prior to the IPO and Corporate Reorganization, Liberty Holdings issued Class B units of Liberty Holdings (“Legacy Units”). The Legacy Units were determined to have a de minimis grant-date fair value based on their assigned benchmark values. In connection with the Corporate Reorganization, the unvested Legacy Units were exchanged for 1,258,514 shares of restricted stock with the same terms and requisite vesting conditions. The shares of restricted stock retain the grant date fair value of the Legacy Units.
Schedule of Nonvested Restricted Stock Units Activity	Changes in non-vested RSUs outstanding under the LTIP during the six months ended June 30, 2019 were as follows: Number of Units Weighted Average Grant Date Fair Value per Unit Non-vested as of December 31, 2018 1,193,683 $ 19.24 Granted 877,732 15.09 Vested (327,799 ) 19.97 Forfeited (13,029 ) 19.12 Outstanding at June 30, 2019 1,730,587 $ 17.00 Changes in non-vested PSUs outstanding under the LTIP during the six months ended June 30, 2019 were as follows: Number of Units Weighted Average Grant Date Fair Value per Unit Non-vested as of December 31, 2018 — $ — Granted 356,908 14.93 Vested — — Forfeited — — Outstanding at June 30, 2019 356,908 $ 14.93

Net Income per Share (Tables)

Net Income per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table reflects the allocation of net income to common stockholders and net income per share computations for the periods indicated based on a weighted average number of common stock outstanding for periods subsequent to the Corporate Reorganization on January 17, 2018: Three Months Ended Six Months Ended (In thousands) June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Basic Net Income Per Share Numerator: Net income attributable to Liberty Oilfield Services Inc. stockholders $ 22,032 $ 49,595 $ 40,153 $ 73,270 Denominator: Basic weighted average shares outstanding 68,404 69,020 67,918 68,977 Basic net income per share attributable to Liberty Oilfield Services Inc. stockholders $ 0.32 $ 0.72 $ 0.59 $ 1.06 Diluted Net Income Per Share Numerator: Net income attributable to Liberty Oilfield Services Inc. stockholders $ 22,032 $ 49,595 $ 40,153 $ 73,270 Effect of exchange of the shares of Class B Common Stock for shares of Class A Common Stock 13,992 34,171 25,825 50,482 Diluted net income attributable to Liberty Oilfield Services Inc. stockholders $ 36,024 $ 83,766 $ 65,978 $ 123,752 Denominator: Basic weighted average shares outstanding 68,404 69,020 67,918 68,977 Effect of dilutive securities: Restricted stock 556 948 578 994 Restricted stock units 1,808 463 1,717 229 Class B Common Stock 43,570 48,207 44,064 48,207 Diluted weighted average shares outstanding 114,338 118,638 114,277 118,407 Diluted net income per share attributable to Liberty Oilfield Services Inc. stockholders $ 0.32 $ 0.71 $ 0.58 $ 1.05

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Other Commitments	Future proppant, including rail car transport, and chemical commitments are as follows: ($ in thousands) Remainder of 2019 $ 172,404 2020 261,984 2021 108,826 2022 3,433 2023 — $ 546,647

Selected Quarterly Financial _2

Selected Quarterly Financial Data (unaudited) (Tables)	6 Months Ended
	Jun. 30, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	The following tables summarizes consolidated changes in equity for the three months ended June 30, 2019 and 2018 : Shares of Class A Common Stock Shares of Class B Common Stock Class A Common Stock, Par Value Class B Common Stock, Par Value Additional Paid in Capital Retained Earnings Total Stockholders ’ equity Noncontrolling Interest Total Equity Balance—March 31, 2019 68,744 43,570 $ 687 $ 436 $ 314,967 $ 133,877 $ 449,967 $ 305,515 $ 755,482 Distributions paid and payable to noncontrolling unitholders — — — — — — — (325 ) (325 ) $0.05/unit Distribution to noncontrolling unitholders — — — — — — — (2,179 ) (2,179 ) Restricted stock and RSU forfeitures — — — — — 1 1 — 1 Stock based compensation expense — — — — 3,571 — 3,571 — 3,571 Regular cash dividends declared and distributions paid — — — — — (3,588 ) (3,588 ) — (3,588 ) RSU Vesting 218 — 3 — (439 ) — (436 ) (603 ) (1,039 ) Net income — — — — — 22,032 22,032 18,491 40,523 Balance—June 30, 2019 68,962 43,570 $ 690 $ 436 $ 318,099 $ 152,322 $ 471,547 $ 320,899 $ 792,446 Shares of Class A Common Stock Shares of Class B Common Stock Class A Common Stock, Par Value Class B Common Stock, Par Value Additional Paid in Capital Retained Earnings Total Stockholders ’ equity Noncontrolling Interest Total Equity Balance—March 31, 2018 69,971 48,207 $ 700 $ 482 $ 347,965 $ 23,675 $ 372,822 $ 278,098 $ 650,920 Distribution paid and payable to non-controlling interest unitholders — — — — — — — (7,688 ) (7,688 ) Offering costs for Issuance of Class A Common Stock — — — — 327 — 327 — 327 Stock based compensation expense — — — — 1,196 — 1,196 — 1,196 Restricted stock forfeited (13 ) — — — — — — — — Net income — — — — — 49,595 49,595 45,146 94,741 Balance—June 30, 2018 69,958 48,207 $ 700 $ 482 $ 349,488 $ 73,270 $ 423,940 $ 315,556 $ 739,496

Significant Accounting Polici_3

Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)fleet	Jun. 30, 2019USD ($)fleet	Jun. 30, 2018USD ($)fleet	Jan. 01, 2019USD ($)	Dec. 31, 2018USD ($)
Deferred Revenue Arrangement [Line Items]
Finance lease right-of-use assets	$ 59,422		$ 59,422			$ 0
Finance lease, liability	54,036		54,036
Operating lease right-of-use assets	61,143		61,143			$ 0
Operating lease, liability	60,534		$ 60,534
Customer payment terms			45 days
Start-up costs	$ 400	$ 3,300	$ 1,500	$ 6,600
Number of fleets established | fleet		1	1	3
Accounting Standards Update 2016-02
Deferred Revenue Arrangement [Line Items]
Finance lease right-of-use assets					$ 57,200
Finance lease, liability					53,200
Operating lease right-of-use assets					64,000
Operating lease, liability					63,600
Prepaid Expenses and Other Current Assets | Accounting Standards Update 2016-02
Deferred Revenue Arrangement [Line Items]
Cumulative effect of new accounting principle in period of adoption					1,900
Prepaid Expenses and Other Current Assets | Operating Lease | Accounting Standards Update 2016-02
Deferred Revenue Arrangement [Line Items]
Cumulative effect of new accounting principle in period of adoption					2,100
Other Assets | Operating Lease | Accounting Standards Update 2016-02
Deferred Revenue Arrangement [Line Items]
Cumulative effect of new accounting principle in period of adoption					2,000
Accrued Interest and Other Liabilities | Accounting Standards Update 2016-02
Deferred Revenue Arrangement [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ 1,500

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory [Line Items]
Inventories	$ 86,809	$ 60,024
Proppants
Inventory [Line Items]
Inventories	22,919	22,038
Chemicals
Inventory [Line Items]
Inventories	12,780	10,781
Maintenance parts
Inventory [Line Items]
Inventories	$ 51,110	$ 27,205

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,019,632		$ 1,019,632		$ 877,625
Less accumulated depreciation and amortization	(377,288)		(377,288)		(307,277)
Property and equipment, before construction in-progress, net	642,344		642,344		570,348
Construction in-progress	5,270		5,270		56,705
Property and equipment, net	647,614		647,614		627,053
Depreciation	37,400	$ 30,600	73,100	$ 58,600
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	5,400		5,400		5,400
Field services equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	919,614		$ 919,614		778,423
Field services equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives			2 years
Field services equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives			7 years
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	60,053		$ 60,053		59,807
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives			4 years
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives			7 years
Buildings and facilities
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,197		$ 28,197		27,795
Buildings and facilities | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives			5 years
Buildings and facilities | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives			30 years
Office equipment, furniture, and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,368		$ 6,368		$ 6,200
Office equipment, furniture, and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives			2 years
Office equipment, furniture, and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives			7 years

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Amortization of right-of-use assets	$ 2,611		$ 4,977
Interest on lease liabilities	699		1,350	$ 0
Operating lease cost	5,053		10,264
Variable lease cost	603		1,607
Total lease cost	8,966		18,198
Rent expense		$ 9,400		$ 17,300
Operating lease, residual value of leased asset	$ 3,100		$ 3,100

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Cash paid for amounts included in measurement of liabilities:
Operating leases	$ 2,752	$ 10,550
Finance leases	3,512	6,794
Right-of-use assets obtained in exchange for new lease liabilities:
Operating leases	625	70,055
Finance leases	$ 6,718	$ 64,139

Leases - Lease Term And Discoun

Leases - Lease Term And Discount Rates (Details)	Jun. 30, 2019
Leases [Abstract]
Operating lease, weighted average remaining lease term	6 years 4 months 24 days
Finance lease, weighted average remaining lease term	1 year 9 months 18 days
Operating lease, weighted average discount rate	5.40%
Finance lease, weighted average discount rate	5.20%

Leases - Finance and Operating

Leases - Finance and Operating Leases Maturity (Details) $ in Thousands	Jun. 30, 2019USD ($)
Finance
Remainder of 2019	$ 7,241
2020	26,788
2021	20,395
2022	3,444
2023	0
Thereafter	0
Total lease payments	57,868
Less imputed interest	(3,832)
Total	54,036
Operating
Remainder of 2019	9,679
2020	18,445
2021	13,584
2022	7,126
2023	4,245
Thereafter	19,588
Total lease payments	72,667
Less imputed interest	(12,133)
Total	$ 60,534

- Operating Lease Future Minimu

- Operating Lease Future Minimum Payments (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 42,717
2020	48,685
2021	32,390
2022	6,093
2023	4,303
Thereafter	19,742
Total lease payments	$ 153,930

Debt - Summary of Debt (Details

Debt - Summary of Debt (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 111,278,000
Deferred financing costs and original issue discount	(4,506,000)	$ (5,191,000)
Total debt, net of deferred financing costs and original issue discount	106,772,000	106,524,000
Current portion of long-term debt, net of discount	397,000	385,000
Long-term debt, net of discount and current portion	106,375,000	106,139,000
Term Loan Outstanding
Debt Instrument [Line Items]
Long-term debt, gross	111,278,000	$ 111,715,000
Revolving Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 0

Debt - Credit Facilities (Detai

Debt - Credit Facilities (Details)	6 Months Ended
	Jun. 30, 2019USD ($)	Sep. 19, 2017USD ($)agreement
Debt Instrument [Line Items]
Long-term debt, gross	$ 111,278,000
Revolving Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	0
Revolving Credit Facility
Debt Instrument [Line Items]
Number of credit agreements | agreement		2
Revolving Credit Facility | ABL Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 250,000,000
Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Current borrowing capacity	$ 234,200,000
Line of credit, maturity, number of days prior maturity of another facility	90 days
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 175,000,000
Letter of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 300,000
Remaining borrowing capacity	$ 233,900,000
Minimum | Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage	0.375%
Maximum | Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Unused capacity, commitment fee percentage	0.50%

Debt - Term Loan Facility (Deta

Debt - Term Loan Facility (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Sep. 19, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 111,278,000
Revolving Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 0
Revolving Credit Facility | ABL Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 250,000,000
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 175,000,000
Weighted average interest rate	10.00%
Line of credit facility, outstanding balance, quarterly principal payments, percent	1.00%
Line of credit facility, covenant compliance, fixed charge coverage ratio	1.2
Line of credit facility, covenant compliance, liquidity threshold for five consecutive business days	$ 25,000,000
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility | Minimum
Debt Instrument [Line Items]
Line of credit facility, covenant compliance, annual percentage of excess cash flow	25.00%
Revolving Credit Facility | Revolving Line of Credit | Term Loan Facility | Maximum
Debt Instrument [Line Items]
Line of credit facility, covenant compliance, annual percentage of excess cash flow	50.00%
Revolving Credit Facility | Revolving Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Line of credit facility, covenant compliance, fixed charge coverage ratio	1
Line of credit facility, covenant compliance, excess availability threshold, percent of borrowing base	10.00%
Line of credit facility, covenant compliance, excess availability threshold, amount	$ 12,500,000

Debt - Maturities of Debt (Deta

Debt - Maturities of Debt (Details) $ in Thousands	Jun. 30, 2019USD ($)
Debt Disclosure [Abstract]
Remainder of 2019	$ 1,313
2020	1,750
2021	1,750
2022	106,465
2023	0
Long-term debt, gross	$ 111,278

Fair Value Measurements and F_2

Fair Value Measurements and Financial Instruments (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash balances on deposit with financial institutions	$ 32,503,000		$ 32,503,000		$ 103,312,000
Customer payment terms			45 days
Allowance for uncollectible accounts	$ 0		$ 0		$ 0
Customer Concentration Risk | Largest Two Customers | Accounts Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage			23.00%
Customer Concentration Risk | Largest Two Customers | Total Revenue
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage		15.00%
Customer Concentration Risk | Largest Customer | Accounts Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage					28.00%
Customer Concentration Risk | Largest Customer | Total Revenue
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage	10.00%		10.00%	16.00%

Equity - Additional Information

Equity - Additional Information (Details) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Subsidiary or Equity Method Investee [Line Items]
Preferred stock, shares authorized (in shares)	10,000	10,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Shares of Class A Common Stock
Subsidiary or Equity Method Investee [Line Items]
Common stock, shares outstanding (in shares)	68,962,200	68,359,871
Shares of Class A Common Stock | Restricted Stock
Subsidiary or Equity Method Investee [Line Items]
Common stock, shares outstanding (in shares)	555,713
Shares of Class B Common Stock
Subsidiary or Equity Method Investee [Line Items]
Common stock, shares outstanding (in shares)	43,570,372	45,207,372

Equity - Restricted Stock Award

Equity - Restricted Stock Awards and Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 17, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based compensation expense			$ 1.2	$ 6.5	$ 1
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)				1,193,683
Granted (in shares)				877,732
Vested (in shares)				(327,799)
Forfeited (in shares)				(13,029)
Outstanding at end of period (in shares)		1,730,587		1,730,587
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of period (in dollars per share)				$ 19.24
Granted (in dollars per share)				15.09
Vested (in dollars per share)				19.97
Forfeited (in dollars per share)				19.12
Outstanding at end of period (in dollars per share)		$ 17		$ 17
Vesting period of awards				5 years
Share-based compensation expense		$ 3.6
Unamortized compensation expense		$ 29.3		$ 29.3
Weighted average remaining vesting period				2 years 3 months 18 days
Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)				0
Granted (in shares)				356,908
Vested (in shares)				0
Forfeited (in shares)				0
Outstanding at end of period (in shares)		356,908		356,908
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of period (in dollars per share)				$ 0
Granted (in dollars per share)				14.93
Vested (in dollars per share)				0
Forfeited (in dollars per share)				0
Outstanding at end of period (in dollars per share)		$ 14.93		$ 14.93
Vesting period of awards				3 years
Shares of Class A Common Stock | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)				634,653
Vested (in shares)				(78,940)
Forfeited (in shares)				0
Outstanding at end of period (in shares)		555,713		555,713
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Forfeited (in dollars per share)				$ 0
Shares issued (in shares)	1,258,514
Shares of Class A Common Stock | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of period (in dollars per share)				0
Vested (in dollars per share)				0
Outstanding at end of period (in dollars per share)		$ 0		$ 0

Equity - Dividends and Repurcha

Equity - Dividends and Repurchase of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 20, 2019	Jan. 31, 2019	Jun. 30, 2019	Jan. 22, 2019
Shares of Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount				$ 100
Shares of Class A Common Stock | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, common stock, cash			$ 6.9
Common stock, dividends, per share, declared (in dollars per share)	$ 0.05
Treasury stock, shares, retired (in shares)			1,303,003
Treasury stock, retired, amount			$ 18.4
Remaining authorized repurchase amount			$ 98.7
Liberty LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, dividends, per share, declared (in dollars per share)			$ 0.05
Liberty LLC | LLC Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, common stock, cash			$ 11.2
Treasury stock, shares, retired (in shares)			1,303,003
Treasury stock, retired, amount			$ 18.4
Restricted Stock and Restricted Stock Units (RSUs) | Shares of Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, common stock, cash			$ 0.2
Riverstone | Affiliated Entity | Shares of Class A Common Stock | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock, shares, retired (in shares)		117,647
Treasury stock acquired, average cost per share (in dollars per share)		$ 17	$ 14.66

Net Income per Share - Earnings

Net Income per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 17, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income attributable to Liberty Oilfield Services Inc. Stockholders	$ 8,705	$ 22,032	$ 49,595	$ 40,153	$ 73,270
Denominator, Basic [Abstract]
Basic weighted average shares outstanding (in shares)		68,404	69,020	67,918	68,977
Basic net income per share attributable to Liberty Oilfield Services Inc. Stockholders (in dollars per share)		$ 0.32	$ 0.72	$ 0.59	$ 1.06
Numerator, Diluted [Abstract]
Net income attributable to Liberty Oilfield Services Inc. Stockholders	$ 8,705	$ 22,032	$ 49,595	$ 40,153	$ 73,270
Effect of exchange of the shares of Class B Common Stock for shares of Class A Common Stock		13,992	34,171	25,825	50,482
Net Income (Loss) Available to Common Stockholders, Diluted		$ 36,024	$ 83,766	$ 65,978	$ 123,752
Denominator, Diluted [Abstract]
Basic weighted average shares outstanding (in shares)		68,404	69,020	67,918	68,977
Effect of dilutive securities:
Restricted stock (in shares)		556	948	578	994
Restricted stock units (in shares)		1,808	463	1,717	229
Class B Common Stock (in shares)		43,570	48,207	44,064	48,207
Diluted weighted average shares outstanding (in shares)		114,338	118,638	114,277	118,407
Diluted net income per share attributable to Liberty Oilfield Services Inc. Stockholders (in dollars per share)		$ 0.32	$ 0.71	$ 0.58	$ 1.05

Income Taxes (Details)

Income Taxes (Details) $ in Thousands	Jan. 17, 2018agreement	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Operating Loss Carryforwards [Line Items]
Effective combined income tax rate					15.00%	13.90%
Income tax expense		$ 7,083	$ 15,930	$ 24,000	$ 13,143	$ 24,009
Number of tax receivable agreements | agreement	2
Deferred tax asset		25,800			25,800
Taxes payable		21,900			21,900
Taxes payable, current		(1,800)			(1,800)
Taxes payable, noncurrent		20,074			20,074		$ 16,818
Shares of Class B Common Stock | Tax Receivable Agreement | Common Stock
Operating Loss Carryforwards [Line Items]
Deferred tax asset		6,000			6,000
Taxes payable		$ 5,100			$ 5,100

Defined Contribution Plan (Deta

Defined Contribution Plan (Details) - 401(k) Defined Contribution Retirement Plan - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution per one dollar of employee contribution				$ 1
Maximum annual contribution per employee, percent	6.00%
Contributions made by the employer		$ 3,900,000	$ 3,400,000	$ 8,000,000	$ 6,700,000

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	Jun. 24, 2019	Jan. 17, 2018	Jan. 11, 2018	Jan. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Accrued liabilities—related party					$ 0		$ 0		$ 2,300,000
Revenue from related parties					4,825,000	$ 0	11,142,000	$ 4,062,000
Note receivable—related party					15,601,000		15,601,000		0
Prepaid expense and other current assets					20,332,000		20,332,000		49,924,000
Cost of goods sold					426,444,000	455,469,000	855,743,000	832,296,000
Affiliated Entity | Equity transaction, reorganization
Related Party Transaction [Line Items]
Asset contribution, reorganization		$ 2,100,000
Consideration received		$ 42,600,000
Liberty Resources LLC | Affiliated Entity | Hydraulic Fracturing Services
Related Party Transaction [Line Items]
Revenue from related parties					4,800,000	0	11,100,000	3,900,000
Accounts receivable, related parties					0		0		15,100,000
Unbilled receivables, related parties					0		0		0
Note receivable—related party	$ 15,600,000
Receivable with Imputed Interest, Effective Yield (Interest Rate)	13.00%
Accrued Interest Receivable, Related Party					700,000		700,000
Riverstone | Affiliated Entity | Service Fees
Related Party Transaction [Line Items]
Accrued liabilities—related party			$ 2,000,000		0		0		2,300,000
Interest And Settlement Expense									300,000
Expenses from transactions with related party					0			0
Proppant Express Investments, LLC | Affiliated Entity | Administrative Support and Purchase and Lease Proppant Logistics Equipment
Related Party Transaction [Line Items]
Due to related parties					100,000		100,000		200,000
Accounts receivable, related parties					0		0		$ 0
Purchases from related party					0	0	0	2,100,000
Leases from related party					$ 2,400,000	$ 1,100,000	4,900,000	2,700,000
Discount, percentage					5.00%	5.00%
Prepayment expense					$ 4,200,000	$ 5,400,000	$ 4,200,000	$ 5,400,000
Shares of Class A Common Stock | Common Stock
Related Party Transaction [Line Items]
Treasury stock, shares, retired (in shares)					1,303,003
Shares of Class A Common Stock | Common Stock | Riverstone | Affiliated Entity
Related Party Transaction [Line Items]
Treasury stock, shares, retired (in shares)				117,647
Treasury stock acquired, average cost per share (in dollars per share)				$ 17	$ 14.66
IPO | Shares of Class A Common Stock | Common Stock | Riverstone | Affiliated Entity | Service Fees
Related Party Transaction [Line Items]
Number of shares issued (shares)			117,647

Commitments and Contingencies -

Commitments and Contingencies - Proppant, Chemical and Rail Car Commitments (Details) $ in Thousands	Jun. 30, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2019	$ 172,404
2020	261,984
2021	108,826
2022	3,433
2023	0
Other commitment	$ 546,647

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Details) gal in Thousands, $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2019Tgal	Jun. 30, 2018USD ($)T	Dec. 31, 2018gal
Long-term Purchase Commitment [Line Items]
Rent expense | $	$ 9.4		$ 17.3
Proppant
Long-term Purchase Commitment [Line Items]
Minimum mass required (in tons) | T		9,694,350	11,266,000
Chemicals
Long-term Purchase Commitment [Line Items]
Minimum volume required | gal		14,139		18,852

Selected Quarterly Financial _3

Selected Quarterly Financial Data - Equity Statement (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		5 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 755,482	$ 650,920	$ 401,322	$ 740,814
Distribution paid and payable to noncontrolling interest unitholders	(325)	(7,688)	(13,041)	(547)
$0.05/unit distribution to noncontrolling unitholders	(2,179)			(4,358)
Restricted stock and RSU forfeitures	1			2
Restricted stock forfeited		0	0
Stock based compensation expense	3,571	1,196		6,451
Regular cash dividends declared and distributions paid	(3,588)			(7,107)
RSU Vesting	(1,039)			(1,039)
Offering costs for Issuance of Class A Common Stock		327
Net income	40,523	94,741	140,023	74,432
Ending balance	$ 792,446	739,496	739,496	$ 792,446
Price per unit (in dollar per share)	$ 0.05			$ 0.05
Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 314,967	347,965	0	$ 312,659
Stock based compensation expense	3,571	1,196		6,451
RSU Vesting	(439)			(303)
Offering costs for Issuance of Class A Common Stock		327
Ending balance	318,099	349,488	349,488	318,099
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	133,877	23,675	0	119,274
Restricted stock and RSU forfeitures	1			2
Regular cash dividends declared and distributions paid	(3,588)			(7,107)
Net income	22,032	49,595	73,270	40,153
Ending balance	152,322	73,270	73,270	152,322
Total Stockholders’ equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	449,967	372,822	0	433,069
Restricted stock and RSU forfeitures	1			2
Restricted stock forfeited		0	0
Stock based compensation expense	3,571	1,196		6,451
Regular cash dividends declared and distributions paid	(3,588)			(7,107)
RSU Vesting	(436)			(300)
Offering costs for Issuance of Class A Common Stock		327
Net income	22,032	49,595	73,270	40,153
Ending balance	471,547	423,940	423,940	471,547
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	305,515	278,098	0	307,745
Distribution paid and payable to noncontrolling interest unitholders	(325)	(7,688)	(13,041)	(547)
$0.05/unit distribution to noncontrolling unitholders	(2,179)			(4,358)
RSU Vesting	(603)			(739)
Net income	18,491	45,146	66,753	34,279
Ending balance	$ 320,899	$ 315,556	$ 315,556	$ 320,899
Shares of Class A Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)				68,359,871
Ending balance (in shares)	68,962,200			68,962,200
Shares of Class A Common Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	68,744,000	69,971,000	0	68,360,000
Beginning balance	$ 687	$ 700	$ 0	$ 684
Restricted stock forfeited (shares)		(13,000)	(17,000)
RSU Vesting (shares)	218,000			(268,000)
RSU Vesting	$ 3			$ 3
Ending balance (in shares)	68,962,000	69,958,000	69,958,000	68,962,000
Ending balance	$ 690	$ 700	$ 700	$ 690
Shares of Class B Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)				45,207,372
Ending balance (in shares)	43,570,372			43,570,372
Shares of Class B Common Stock | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	43,570,000	48,207,000	0	45,207,000
Beginning balance	$ 436	$ 482	$ 0	$ 452
Ending balance (in shares)	43,570,000	48,207,000	48,207,000	43,570,000
Ending balance	$ 436	$ 482	$ 482	$ 436

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares	Jul. 23, 2019	Jul. 31, 2019	Jun. 30, 2019
Subsequent Event
Subsequent Event [Line Items]
Common stock, dividends, per share, declared (in dollars per share)	$ 0.05
Distribution made to Limited Liability Company (LLC) member, distributions declared, per unit (in dollars per unit)	$ 0.05
Liberty LLC
Subsequent Event [Line Items]
Common stock, dividends, per share, declared (in dollars per share)			$ 0.05
Liberty LLC | Shares of Class B Common Stock | Subsequent Event
Subsequent Event [Line Items]
Conversion of stock, shares converted (in shares)		6,190,483
Liberty LLC | Shares of Class A Common Stock | Subsequent Event
Subsequent Event [Line Items]
Conversion of stock, shares issued (in shares)		6,190,483