Select Energy Services (WTTR) 10-Q 5 Aug 20 2020 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 03, 2020
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-38066
Entity Registrant Name	SELECT ENERGY SERVICES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-4561945
Entity Address, Address Line One	1233 W. Loop South, Suite 1400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77027
City Area Code	713
Local Phone Number	235-9500
Title of 12(b) Security	Class A common stock, par value $0.01 per share
Trading Symbol	WTTR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001693256
Amendment Flag	false
Class A Common Stock
Document and Entity Information
Entity Common Stock, Shares Outstanding		86,883,049
Class B Common Stock
Document and Entity Information
Entity Common Stock, Shares Outstanding		16,221,101

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 166,407	$ 79,268
Accounts receivable trade, net of allowance for credit losses of $9,474 and $5,773, respectively	105,465	267,628
Accounts receivable, related parties	1,649	4,677
Inventories	38,186	37,542
Prepaid expenses and other current assets	22,790	26,486
Total current assets	334,497	415,601
Property and equipment	930,308	1,015,379
Accumulated depreciation	(537,323)	(562,986)
Property and equipment held-for-sale, net		885
Total property and equipment, net	392,985	453,278
Right-of-use assets, net	59,431	70,635
Goodwill		266,934
Other intangible assets, net	121,761	136,952
Other assets, net	2,640	4,220
Total assets	911,314	1,347,620
Current liabilities
Accounts payable	11,151	35,686
Accrued accounts payable	13,248	47,547
Accounts payable and accrued expenses, related parties	240	2,789
Accrued salaries and benefits	10,624	20,079
Accrued insurance	10,379	8,843
Sales tax payable	1,014	2,119
Accrued expenses and other current liabilities	12,957	15,375
Current operating lease liabilities	14,746	19,315
Current portion of finance lease obligations	297	128
Total current liabilities	74,656	151,881
Long-term operating lease liabilities	65,928	72,143
Other long-term liabilities	11,093	10,784
Total liabilities	151,677	234,808
Commitments and contingencies (Note 10)
Preferred stock, $0.01 par value; 50,000,000 shares authorized; no shares issued and outstanding as of June 30, 2020 and December 31, 2019
Additional paid-in capital	906,164	914,699
Accumulated (deficit) retained earnings	(268,723)	21,437
Total stockholders' equity	638,472	937,177
Noncontrolling interests	121,165	175,635
Total equity	759,637	1,112,812
Total liabilities and equity	911,314	1,347,620
Class A Common Stock
Current liabilities
Common stock	869	879
Total equity	869	879
Class B Common Stock
Current liabilities
Common stock	162	162
Total equity	$ 162	$ 162

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ 9,474	$ 5,773
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	50,000,000	50,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Class A Common Stock
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	350,000,000	350,000,000
Common Stock, Shares, Issued	86,883,049	87,893,525
Class A-2 Common Stock
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	40,000,000	40,000,000
Common Stock, Shares, Issued	0	0
Common Stock, Shares, Outstanding	0	0
Class B Common Stock
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	150,000,000	150,000,000
Common Stock, Shares, Issued	16,221,101	16,221,101
Common Stock, Shares, Outstanding	16,221,101	16,221,101

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue
Total revenue	$ 92,239	$ 323,887	$ 370,524	$ 686,533
Costs of revenue
Depreciation and amortization	25,508	28,843	51,690	60,361
Total costs of revenue	115,958	283,948	378,947	600,597
Gross (loss) profit	(23,719)	39,939	(8,423)	85,936
Operating expenses
Selling, general and administrative	17,658	27,297	42,947	59,673
Depreciation and amortization	834	906	1,519	1,906
Impairment of goodwill and trademark			276,016	4,396
Impairment and abandonment of property and equipment	4,726	374	7,910	893
Lease abandonment costs	868	183	1,821	1,256
Total operating expenses	24,086	28,760	330,213	68,124
(Loss) income from operations	(47,805)	11,179	(338,636)	17,812
Other expense
Losses on sales of property and equipment and divestitures, net	(2,183)	(1,709)	(2,618)	(6,200)
Interest expense, net	(513)	(839)	(844)	(1,932)
Foreign currency gain (loss), net	27	67	(19)	327
Other (expense) income, net	(2,700)	(59)	(2,441)	210
(Loss) income before income tax benefit (expense)	(53,174)	8,639	(344,558)	10,217
Income tax benefit (expense)	130	(571)	294	(749)
Net (loss) income	(53,044)	8,068	(344,264)	9,468
Less: net loss (income) attributable to noncontrolling interests	8,746	(1,868)	54,104	(2,133)
Net (loss) income attributable to Select Energy Services, Inc.	(44,298)	6,200	(290,160)	7,335
Water Services
Revenue
Total revenue	55,807	202,011	205,318	422,606
Costs of revenue
Costs of revenue	54,014	155,151	183,128	318,272
Operating expenses
Impairment of goodwill and trademark			186,468
Lease abandonment costs	848	218	1,783	447
Water Infrastructure
Revenue
Total revenue	15,300	51,710	73,062	105,326
Costs of revenue
Costs of revenue	13,871	38,456	61,684	79,886
Operating expenses
Impairment of goodwill and trademark			80,466
Lease abandonment costs			51
Oilfield Chemicals
Revenue
Total revenue	21,132	63,001	92,144	129,830
Costs of revenue
Costs of revenue	22,562	54,051	82,438	113,578
Operating expenses
Impairment of goodwill and trademark			9,082
Lease abandonment costs	42	7	42	7
Other
Revenue
Total revenue		7,165		28,771
Costs of revenue
Costs of revenue	3	7,447	7	28,500
Operating expenses
Impairment of goodwill and trademark				4,396
Lease abandonment costs	(22)	(42)	(55)	802
Class A Common Stock
Other expense
Net (loss) income attributable to Select Energy Services, Inc.	$ (44,298)	$ 6,200	$ (290,160)	$ 7,335
Net (loss) income per share attributable to common stockholders (Note 16):
Basic	$ (0.52)	$ 0.08	$ (3.39)	$ 0.09
Diluted	$ (0.52)	$ 0.08	$ (3.39)	$ 0.09

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net (loss) income	$ (53,044)	$ 8,068	$ (344,264)	$ 9,468
Other comprehensive (loss) income
Foreign currency translation adjustment, net of tax of $0		(66)		(12)
Net change in unrealized gain		(66)		(12)
Comprehensive (loss) income	(53,044)	8,002	(344,264)	9,456
Less: comprehensive loss (income) attributable to noncontrolling interests	8,746	(1,853)	54,104	(2,130)
Comprehensive (loss) income attributable to Select Energy Services, Inc.	$ (44,298)	$ 6,149	$ (290,160)	$ 7,326

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Foreign currency translation adjustment, tax amount	$ 0	$ 0	$ 0	$ 0

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Class A Common Stock	Class B Common Stock	Total Stockholders' Equity	Additional Paid-In Capital	Accumulated (Deficit) Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Total
Beginning balance at Dec. 31, 2018	$ 790	$ 260	$ 832,934	$ 813,599	$ 18,653	$ (368)	$ 277,839	$ 1,110,773
Beginning balance (in shares) at Dec. 31, 2018	78,956,555	26,026,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued			58	58			(2)	56
ESPP shares issued (in shares)	5,667
Equity-based compensation			6,271	6,271			2,037	8,308
Issuance of restricted shares	$ 14		3,563	3,549			(3,563)
Issuance of restricted shares (in shares)	1,373,930
Exercise of restricted stock units			4	4			(4)
Exercise of restricted stock units (in shares)	1,250
Repurchase of common stock	$ (2)		(1,541)	(1,539)			25	(1,516)
Repurchase of common stock ( in shares)	(152,502)
Restricted shares forfeited			(23)	(23)			23
Restricted shares forfeited (in shares)	(8,822)
Distributions to noncontrolling interests, net							(225)	(225)
NCI income tax adjustment			49	49			(49)
Foreign currency translation adjustment			(12)			(12)	(4)	(16)
Net (loss) income			7,335		7,335		2,133	9,468
Ending balance at Jun. 30, 2019	$ 802	$ 260	848,638	821,968	25,988	(380)	278,210	1,126,848
Ending balance (in shares) at Jun. 30, 2019	80,176,078	26,026,843
Beginning balance at Mar. 31, 2019	$ 800	$ 260	839,090	818,556	19,788	(314)	276,023	1,115,113
Beginning balance (in shares) at Mar. 31, 2019	79,998,292	26,026,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued			29	29				29
ESPP shares issued (in shares)	2,857
Equity-based compensation			3,117	3,117			1,012	4,129
Issuance of restricted shares	$ 3		527	524			(527)
Issuance of restricted shares (in shares)	204,153
Exercise of restricted stock units			2	2			(2)
Exercise of restricted stock units (in shares)	625
Repurchase of common stock	$ (1)		(296)	(295)			(4)	(300)
Repurchase of common stock ( in shares)	(26,716)
Restricted shares forfeited			(8)	(8)			8
Restricted shares forfeited (in shares)	(3,133)
Distributions to noncontrolling interests, net							(104)	(104)
NCI income tax adjustment			43	43			(43)
Foreign currency translation adjustment			(66)			(66)	(21)	(87)
Net (loss) income			6,200		6,200		1,868	8,068
Ending balance at Jun. 30, 2019	$ 802	$ 260	848,638	821,968	25,988	$ (380)	278,210	1,126,848
Ending balance (in shares) at Jun. 30, 2019	80,176,078	26,026,843
Beginning balance at Dec. 31, 2019	$ 879	$ 162	937,177	914,699	21,437		175,635	1,112,812
Beginning balance (in shares) at Dec. 31, 2019	87,893,525	16,221,101
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued			48	48			(4)	44
ESPP shares issued (in shares)	7,640
Equity-based compensation			1,530	1,530			286	1,816
Issuance of restricted shares	$ 15		2,422	2,407			(2,422)
Issuance of restricted shares (in shares)	1,477,488
Exercise of restricted stock units			1	1			(1)
Exercise of restricted stock units (in shares)	625
Repurchase of common stock	$ (22)		(12,043)	(12,021)			1,405	(10,638)
Repurchase of common stock ( in shares)	(2,155,901)
Restricted shares forfeited	$ (3)		(511)	(508)			511
Restricted shares forfeited (in shares)	(340,328)
Noncontrolling interest in subsidiary							(133)	(133)
NCI income tax adjustment			8	8			(8)
Net (loss) income			(290,160)		(290,160)		(54,104)	(344,264)
Ending balance at Jun. 30, 2020	$ 869	$ 162	638,472	906,164	(268,723)		121,165	759,637
Ending balance (in shares) at Jun. 30, 2020	86,883,049	16,221,101
Beginning balance at Mar. 31, 2020	$ 880	$ 162	686,429	909,812	(224,425)		129,128	815,557
Beginning balance (in shares) at Mar. 31, 2020	87,991,839	16,221,101
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued			18	18			(1)	17
ESPP shares issued (in shares)	3,197
Equity-based compensation			1,047	1,047			195	1,242
Issuance of restricted shares	$ 2		251	249			(251)
Issuance of restricted shares (in shares)	205,782
Repurchase of common stock	$ (12)		(4,804)	(4,792)			802	(4,002)
Repurchase of common stock ( in shares)	(1,176,510)
Restricted shares forfeited	$ (1)		(171)	(170)			171
Restricted shares forfeited (in shares)	(141,259)
Noncontrolling interest in subsidiary							(133)	(133)
Net (loss) income			(44,298)		(44,298)		(8,746)	(53,044)
Ending balance at Jun. 30, 2020	$ 869	$ 162	$ 638,472	$ 906,164	$ (268,723)		$ 121,165	$ 759,637
Ending balance (in shares) at Jun. 30, 2020	86,883,049	16,221,101

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net (loss) income	$ (344,264)	$ 9,468
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation and amortization	53,209	62,267
Net loss on disposal of property and equipment	2,207	2,794
Bad debt expense	4,810	1,312
Amortization of debt issuance costs	344	344
Inventory write-downs	566	209
Equity-based compensation	1,816	8,308
Impairment of goodwill and trademark	276,016	4,396
Impairment and abandonment of property and equipment	7,910	893
Loss on divestitures	411	3,406
Other operating items, net	404	(178)
Changes in operating assets and liabilities
Accounts receivable	160,204	3,346
Prepaid expenses and other assets	3,276	1,245
Accounts payable and accrued liabilities	(64,176)	(23,075)
Net cash provided by operating activities	102,733	74,735
Cash flows from investing activities
Working capital settlement		691
Proceeds received from divestitures	197	25,259
Purchase of property and equipment	(16,461)	(57,513)
Proceeds received from sales of property and equipment	11,015	10,507
Net cash used in investing activities	(5,249)	(21,056)
Cash flows from financing activities
Borrowings from revolving line of credit		5,000
Payments on long-term debt		(50,000)
Payments of finance lease obligations	(121)	(549)
Proceeds from share issuance	44	56
Contributions from (distributions to) noncontrolling interests	383	(225)
Repurchase of common stock	(10,638)	(1,516)
Net cash used in financing activities	(10,332)	(47,234)
Effect of exchange rate changes on cash	(13)	136
Net increase in cash and cash equivalents	87,139	6,581
Cash and cash equivalents, beginning of period	79,268	17,237
Cash and cash equivalents, end of period	166,407	23,818
Supplemental cash flow disclosure:
Cash paid for interest	760	2,024
Cash paid for income taxes, net	544	204
Supplemental disclosure of noncash investing activities:
Capital expenditures included in accounts payable and accrued liabilities	2,422	$ 15,208
Noncash proceeds received from sale of interest in a formerly consolidated joint venture	$ 367

BUSINESS AND BASIS OF PRESENTAT

BUSINESS AND BASIS OF PRESENTATION	6 Months Ended
	Jun. 30, 2020
BUSINESS AND BASIS OF PRESENTATION
BUSINESS AND BASIS OF PRESENTATION	NOTE 1—BUSINESS AND BASIS OF PRESENTATION Description of the business : Select Energy Services, Inc. (“we,” “Select Inc.” or the “Company”) was incorporated as a Delaware corporation on November 21, 2016. The Company is a holding company whose sole material asset consists of common units (“SES Holdings LLC Units”) in SES Holdings, LLC (“SES Holdings”). We are a leading provider of comprehensive water-management solutions to the oil and gas industry in the United States (“U.S.”). We also develop, manufacture and deliver a full suite of chemical solutions for use in oil and gas well completion and production operations. Through a combination of organic growth and acquisitions over the last decade, we have developed a leading position in the relatively new water solutions industry. We believe we are the only company in the oilfield services industry that combines comprehensive water-management services with related chemical products. Furthermore, we believe we are one of the few large oilfield services companies whose primary focus is on the management and treatment of water and water resources in the oil and gas production industry. Accordingly, the importance of responsibly managing water resources through our operations to help conserve fresh water and protect the environment is paramount to our continued success. Select 144A Offering and Initial Public Offering. On December 20, 2016, Select Inc. completed a private placement (the “Select 144A Offering”) of 16,100,000 shares of Select Inc. Class A-1 common stock, par value $0.01 per share, which were converted into shares of Class A common stock, par value $0.01 per share (“Class A Common Stock”) following the Company’s initial public offering (“IPO”). SES Holdings issued 16,100,000 SES Holdings LLC Units to Select Inc., and Select Inc. became the sole managing member of SES Holdings. Select Inc. issued 38,462,541 shares of its Class B common stock, par value $0.01 per share (“Class B Common Stock”), to the other member of SES Holdings, SES Legacy Holdings, LLC (“Legacy Owner Holdco”) or one share for each SES Holdings LLC Unit held by Legacy Owner Holdco. On April 26, 2017, the Company completed its IPO of 8,700,000 shares of Class A Common Stock. Holders of Class A Common Stock and Class B Common Stock vote together as a single class on all matters, subject to certain exceptions in the Company’s amended and restated certificate of incorporation. Holders of Class B Common Stock have voting rights only and are not entitled to an economic interest in Select Inc. based on their ownership of Class B Common Stock. Tax Receivable Agreements: In connection with the Company’s restructuring at the Select 144A Offering, Select Inc. entered into two tax receivable agreements (the “Tax Receivable Agreements”) with Legacy Owner Holdco and certain other affiliates of the then-holders of SES Holdings LLC Units (each such person and any permitted transferee thereof, a “TRA Holder,” and together, the “TRA Holders”). On July 18, 2017, the Company’s board of directors approved amendments to each of the Tax Receivable Agreements. See Note 13—Related Party Transactions for further discussion. Exchange rights: Under the Eighth Amended and Restated Limited Liability Company Agreement of SES Holdings (the “SES Holdings LLC Agreement”), Legacy Owner Holdco and its permitted transferees have the right (an “Exchange Right”) to cause SES Holdings to acquire all or a portion of its SES Holdings LLC Units for, at SES Holdings’ election, (i) shares of Class A Common Stock at an exchange ratio of one share of Class A Common Stock for each SES Holdings LLC Unit exchanged, subject to conversion rate adjustments for stock splits, stock dividends, reclassification and other similar transactions or (ii) cash in an amount equal to the Cash Election Value (as defined within the SES Holdings LLC Agreement) of such Class A Common Stock. Alternatively, upon the exercise of any Exchange Right, Select Inc. has the right (the “Call Right”) to acquire the tendered SES Holdings LLC Units from the exchanging unitholder for, at its election, (i) the number of shares of Class A Common Stock the exchanging unitholder would have received under the Exchange Right or (ii) cash in an amount equal to the Cash Election Value of such Class A Common Stock. In connection with any exchange of SES Holdings LLC Units pursuant to an Exchange Right or Call Right, the corresponding number of shares of Class B Common Stock will be cancelled. During the year ended December 31, 2019, a total of 9,805,742 SES Holdings LLC Units were exchanged for 9,805,742 shares of Class A Common Stock, and 9,805,742 shares of Class B Common Stock were cancelled. There were no exchanges during the Current Period (as defined below). Basis of presentation : The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the U.S. (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). These unaudited interim consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, therefore, do not include all disclosures required for financial statements prepared in conformity with GAAP. This Quarterly Report relates to the three and six months ended June 30, 2020 (the “Current Quarter” and the “Current Period”, respectively) and the three and six months ended June 30, 2019 (the “Prior Quarter” and the “Prior Period”, respectively). The Company’s annual report on Form 10-K for the year ended December 31, 2019 (the “2019 Form 10-K”) filed with the SEC on February 25, 2020 includes certain definitions and a summary of significant accounting policies and should be read in conjunction with this Quarterly Report. All material adjustments (consisting solely of normal recurring adjustments) which, in the opinion of management, are necessary for a fair statement of the results for the interim periods have been reflected. The results for the Current Quarter and Current Period may not be indicative of the results to be expected for the full year, in part due to the COVID-19 outbreak. The unaudited interim consolidated financial statements include the accounts of the Company and all of its majority-owned or controlled subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. For investments in subsidiaries that are not wholly owned, but where the Company exercises control, the equity held by the minority owners and their portion of net income or loss are reflected as noncontrolling interests. Investments in entities for which the Company does not have significant control or influence are accounted for using the cost method. As of June 30, 2020, the Company had one cost-method investment. The Company’s investments are reviewed for impairment whenever events or circumstances indicate that the carrying value may not be recoverable. When circumstances indicate that the fair value of its investment is less than its carrying value and the reduction in value is other than temporary, the reduction in value is recognized in earnings. Segment reporting: The Company has three reportable segments. Reportable segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and assess performance. The Company’s current reportable segments are Water Services, Water Infrastructure, and Oilfield Chemicals. The Water Services segment consists of the Company’s services businesses including water transfer, flowback and well testing, fluids hauling, water containment and water network automation, primarily serving E&P companies. Additionally, this segment includes the operations of our accommodations and rentals business. The Water Infrastructure segment consists of the Company’s infrastructure assets and ongoing infrastructure development projects, including operations associated with our water sourcing and pipeline infrastructure, our water recycling solutions and infrastructure, and our produced water gathering systems and salt water disposal wells, primarily serving E&P companies. ​ The Oilfield Chemicals segment develops, manufactures and provides a full suite of chemicals used in hydraulic fracturing, stimulation, cementing, and well completion and production services, including polymer slurries, crosslinkers, friction reducers, biocides, dry and liquid scale inhibitors, corrosion inhibitors, buffers, breakers and other chemical technologies. This segment also provides chemicals needed by our customers to increase oil and gas production and lower production costs over the life of a well. Given the breadth of chemicals and application expertise we provide, our Oilfield Chemicals customers are primarily pressure pumpers, but also include major integrated and independent oil and gas producers. ​ The results of service lines divested during 2019, including the operations of our Affirm Oilfield Services, LLC subsidiary (“Affirm”), our sand hauling operations and our Canadian operations, are combined in the “Other” category. Reclassifications

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	6 Months Ended
	Jun. 30, 2020
SIGNIFICANT ACCOUNTING POLICIES
SIGNIFICANT ACCOUNTING POLICIES	NOTE 2—SIGNIFICANT ACCOUNTING POLICIES Significant accounting policies : The Company’s significant accounting policies are disclosed in Note 2 of the consolidated financial statements for the year ended December 31, 2019, included in the 2019 Form 10-K. Use of estimates : The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, the Company evaluates its estimates, including those related to the recoverability of long-lived assets and intangibles, useful lives used in depreciation and amortization, uncollectible accounts receivable, inventory, income taxes, self-insurance liabilities, share-based compensation, contingent liabilities and the incremental borrowing rate for leases. The Company bases its estimates on historical and other pertinent information that are believed to be reasonable under the circumstances. The accounting estimates used in the preparation of the consolidated financial statements may change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes. Allowance for credit losses: ​ The following table presents the changes to the allowance for the Current Period: ​ ​ ​ ​ ​ ​ ​ Six months ended June 30, 2020 ​ ​ (in thousands) Balance at beginning of period ​ $ 5,773 Increase to allowance based on a percent of Current Period revenue ​ 741 Adjustment based on aged receivable analysis ​ 4,069 Charge-offs ​ ​ (1,109) Balance at June 30, 2020 ​ $ 9,474 ​ Asset retirement obligations: ​ ​ ​ ​ ​ ​ Six months ended June 30, 2020 ​ (in thousands) Balance at beginning of period $ 1,527 Accretion expense, included in depreciation and amortization expense ​ 62 Disposals ​ (219) Payments ​ ​ (101) Balance at June 30, 2020 $ 1,269 ​ We review the adequacy of our ARO liabilities whenever indicators suggest that the estimated cash flows underlying the liabilities have changed. The Company’s ARO liabilities are included in accrued expenses and other current liabilities and other long-term liabilities in the accompanying consolidated balance sheets. Lessor Income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ ​ 2020 2019 2020 ​ 2019 ​ ​ ​ ​ (in thousands) ​ (in thousands) ​ Category Classification ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lessor income Cost of sales ​ $ 96 ​ $ 69 ​ $ 212 ​ $ 180 ​ Sublease income Lease abandonment costs and Cost of sales ​ ​ 335 ​ ​ 390 ​ ​ 736 ​ ​ 762 ​ ​ The Company also generates short-term equipment rental revenue. See Note 5—Revenue for a discussion of revenue recognition for the accommodations and rentals business. ​ Operating leases: lease liabilities ​ Defined Contribution Plan: ​ Payroll Tax Deferral: Recent accounting pronouncements : In June 2016, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments debt expense from trade receivables, as well as updating future expectations, the adoption of the new standard in the first quarter of 2020 did not have a material impact to the Company’s financial statements. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740)

IMPAIRMENTS AND OTHER COSTS

IMPAIRMENTS AND OTHER COSTS	6 Months Ended
	Jun. 30, 2020
IMPAIRMENTS AND OTHER COSTS
IMPAIRMENT, REALIGNMENT AND OTHER	NOTE 3—IMPAIRMENTS AND OTHER COSTS ​ Significant challenges that emerged during the Current Period and that are expected to continue have had and will continue to have a negative impact on our results of operations. The COVID-19 pandemic has caused a worldwide slowdown in economic activity, resulting in a sharp decline in global oil demand and therefore, lower oil and natural gas prices. Global oil demand is expected to remain challenged at least until the COVID-19 pandemic can be contained. In response to lower oil and gas prices, our E&P customers have cut capital spending, resulting in a sharp drop in the number of wells drilled and completed in all of our markets. Reduced demand for our services has had a material, negative impact on our Current Quarter and Current Period financial results. While oil prices have recovered from the recent lows, given the continued uncertainty around the COVID-19 pandemic and the associated impact on oil demand, we are unable to predict if, when, and by how much the demand for our services and therefore our financial performance will improve. ​ Because the magnitude and duration of the COVID-19 pandemic is unknown, we cannot forecast with reasonable certainty its impact on our business, financial condition or near or longer-term financial or operational results. However, we currently expect that our 2020 net income will be negative. During the Current Period, we have taken actions to protect our balance sheet and maintain our liquidity, including significantly decreasing our operating expenses by reducing headcount, reducing salaries and director compensation, idling facilities, closing yard locations, reducing third party expenses and streamlining operations, as well as reducing capital expenditures. We are also deferring employer payroll tax payments for the remainder of 2020, in accordance with the provisions of the CARES Act, and may take advantage of future legislation passed by the United States Congress in response to COVID-19. ​ As a result of the downturn in our business, we recorded impairment expenses in the first quarter of 2020 related to goodwill, property and equipment and other intangible assets and recorded additional impairment expense related to the abandonment of property and equipment in the Current Quarter. There is no assurance that we will not have additional impairments in subsequent quarters. ​ A summary of impairment, severance, yard closure and lease abandonment costs for the Current Quarter, Prior Quarter, Current Period and Prior Period were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ 2020 2019 ​ 2020 ​ 2019 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impairment of goodwill and trademark ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ — ​ $ — ​ $ 186,468 ​ $ — ​ Water Infrastructure ​ ​ — ​ ​ — ​ ​ 80,466 ​ ​ — ​ Oilfield Chemicals ​ ​ — ​ ​ — ​ ​ 9,082 ​ ​ — ​ Other ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,396 ​ Total impairment of goodwill and trademark ​ $ — ​ $ — ​ $ 276,016 ​ $ 4,396 ​ ​ For a discussion of the impairments to goodwill and trademark, See Note 8—Goodwill and Other Intangible Assets. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ ​ 2020 2019 ​ 2020 ​ 2019 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impairment and abandonment of property and equipment ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 1,396 ​ $ — ​ $ 3,894 ​ $ — ​ Water Infrastructure ​ ​ 3,330 ​ ​ — ​ ​ 4,016 ​ ​ — ​ Other ​ ​ — ​ ​ 374 ​ ​ — ​ ​ 893 ​ Total impairment and abandonment of property and equipment ​ $ 4,726 ​ $ 374 ​ $ 7,910 ​ $ 893 ​ ​ During the Current Quarter and Current Period, the Company recorded an impairment of $4.7 million and $7.9 million, respectively, related to certain equipment that was determined to be obsolete. During the Prior Quarter and Prior Period, the Company recorded an impairment of $0.4 million and $0.9 million, respectively, of Canadian property and equipment to write down the carrying value based on the expected future sale proceeds at that time. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ ​ 2020 2019 ​ 2020 ​ 2019 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Severance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 2,746 ​ $ — ​ $ 4,569 ​ $ — ​ Water Infrastructure ​ ​ 212 ​ ​ — ​ ​ 500 ​ ​ — ​ Oilfield Chemicals ​ ​ 693 ​ ​ — ​ ​ 813 ​ ​ — ​ Other ​ ​ 15 ​ ​ — ​ ​ 1,286 ​ ​ 1,680 ​ Total severance expense ​ $ 3,666 ​ $ — ​ $ 7,168 ​ $ 1,680 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Yard closure costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 695 ​ $ — ​ $ 2,645 ​ $ — ​ Oilfield Chemicals ​ ​ 316 ​ ​ — ​ ​ 316 ​ ​ — ​ Total yard closure costs ​ $ 1,011 ​ $ — ​ $ 2,961 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease abandonment costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 848 ​ $ 218 ​ $ 1,783 ​ $ 447 ​ Water Infrastructure ​ ​ — ​ ​ — ​ ​ 51 ​ ​ — ​ Oilfield Chemicals ​ ​ 42 ​ ​ 7 ​ ​ 42 ​ ​ 7 ​ Other ​ ​ (22) ​ ​ (42) ​ ​ (55) ​ ​ 802 ​ Total lease abandonment costs ​ $ 868 ​ $ 183 ​ $ 1,821 ​ $ 1,256 ​ ​ ​ During the Current Period, the Company recorded exit-disposal costs including $7.2 million of severance costs, with $1.8 million of accrued severance at June 30, 2020, $3.0 million in accrued yard closure costs recognized within costs of revenue on the accompanying consolidated statements of operations, and $1.8 million of lease abandonment costs. Severance costs of $4.0 million and $3.2 million are recognized within costs of revenue and selling, general and administrative expenses, respectively, on the accompanying consolidated statements of operations. During the Prior Period, the Company recorded exit-disposal costs including $1.7 million of severance recognized within selling, general and administrative expenses on the accompanying consolidated statements of operations, and $1.3 million of lease abandonment costs, both of which primarily related to the Company’s divested service lines.

ACQUISITIONS

ACQUISITIONS	6 Months Ended
	Jun. 30, 2020
ACQUISITIONS
ACQUISITIONS	NOTE 4—Acquisitions ​ Business combinations Well Chemical Services Acquisition On September 30, 2019, the Company acquired a well chemical services business (“WCS”), formerly a division of Baker Hughes Company, for $10.0 million, funded with cash on hand (the “WCS Acquisition”). WCS provides advanced water treatment solutions, specialized stimulation flow assurance and integrity additives and post-treatment monitoring service in the U.S. This acquisition expands the Company’s service offerings in oilfield water treatment across the full life-cycle of water, from pre-fracturing treatment through reuse and recycling. The WCS Acquisition was accounted for as a business combination under the acquisition method of accounting. When determining the fair values of assets acquired and liabilities assumed, management made significant estimates, judgments and assumptions. These estimates, judgments and assumptions and valuation of the inventory and property and equipment acquired, customer relationships, and current liabilities were finalized as of December 31, 2019. The assets acquired and liabilities assumed are included in the Company’s Oilfield Chemicals segment. The following table summarizes the consideration transferred and the estimated fair value of identified assets acquired and liabilities assumed at the date of acquisition: ​ ​ ​ ​ ​ Purchase price allocation Amount Consideration transferred (in thousands) Cash paid ​ $ 10,000 Total consideration transferred ​ 10,000 Less: identifiable assets acquired and liabilities assumed ​ Inventory ​ 5,221 Property and equipment ​ 4,473 Customer relationships ​ 476 Current liabilities ​ ​ (170) Total identifiable net assets acquired ​ 10,000 Fair value allocated to net assets acquired ​ $ 10,000 ​

REVENUE

REVENUE	6 Months Ended
	Jun. 30, 2020
REVENUE
REVENUE	NOTE 5—REVENUE ​ The Company follows ASU 2014-09, Revenue from Contracts with Customers (Topic 606) Leases The following factors are applicable to all three of the Company’s segments for the first six months of 2020 and 2019, respectively: ● The vast majority of customer agreements are short-term, lasting less than one year. ● Contracts are seldom combined together as virtually all of our customer agreements constitute separate performance obligations. Each job is typically distinct, thereby not interdependent or interrelated with other customer agreements. ● Most contracts allow either party to terminate at any time without substantive penalties. If the customer terminates the contract, the Company is unconditionally entitled to the payments for the products delivered to date. ● Contract terminations before the end of the agreement are rare. ● Sales returns are rare and no sales return assets have been recognized on the balance sheet. ● There are minimal volume discounts. ● There are no service-type warranties. ● There is no long-term customer financing. In the Water Services and Water Infrastructure segments, performance obligations arise in connection with services provided to customers in accordance with contractual terms, in an amount the Company expects to collect. Services are generally sold based upon customer orders or contracts with customers that include fixed or determinable prices. Revenues are generated by services rendered and measured based on output generated, which is usually simultaneously received and consumed by customers at their job sites. As a multi-job site organization, contract terms, including pricing for the Company’s services, are negotiated on a job site level on a per-job basis. Most jobs are completed in a short period of time, usually between one day and one month. Revenue is recognized as performance obligations are completed on a daily, hourly or per unit basis with unconditional rights to consideration for services rendered reflected as accounts receivable trade, net of allowance for credit losses. In cases where a prepayment is received before the Company satisfies its performance obligations, a contract liability is recorded in accrued expenses and other current liabilities. Final billings generally occur once all of the proper approvals are obtained. No revenue is associated with mobilization or demobilization of personnel and equipment. Rather, mobilization and demobilization are factored into pricing for services. Billings and costs related to mobilization and demobilization is not material for customer agreements that start in one period and end in another. As of June 30, 2020, the Company had five contracts in place for these segments lasting over a year. In the Oilfield Chemicals segment, the typical performance obligation is to provide a specific quantity of chemicals to customers in accordance with the customer agreement in an amount the Company expects to collect. Products and services are generally sold based upon customer orders or contracts with customers that include fixed or determinable prices. Revenue is recognized as the customer takes title to chemical products in accordance with the agreement. Products may be provided to customers in packaging or delivered to the customers’ containers through a hose. In some cases, the customer takes title to the chemicals upon consumption from storage containers on their property, where the chemicals are considered inventory until customer usage. In cases where the Company delivers products and recognizes revenue before collecting payment, the Company usually has an unconditional right to payment reflected in accounts receivable trade, net of allowance for credit losses. Customer returns are rare and immaterial and there were no in-process customer agreements for this segment as of June 30, 2020, lasting greater than one year. The Company accounts for accommodations and rentals agreements as an operating lease. The Company recognizes revenue from renting equipment on a straight-line basis. Accommodations and rental contract periods are generally daily, weekly or monthly. The average lease term is less than three months and as of June 30, 2020, no rental agreements lasted more than a year. The following table sets forth certain financial information with respect to the Company’s disaggregation of revenues by geographic location: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ 2020 2019 2020 ​ 2019 ​ ​ (in thousands) Geographic Region ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Permian Basin ​ $ 36,638 ​ $ 148,118 ​ $ 174,636 ​ $ 310,783 Eagle Ford ​ ​ 10,672 ​ ​ 41,033 ​ ​ 46,336 ​ ​ 79,759 Haynesville/E. Texas ​ ​ 14,708 ​ ​ 18,314 ​ ​ 33,723 ​ ​ 35,596 Marcellus/Utica ​ ​ 13,251 ​ ​ 28,292 ​ ​ 33,090 ​ ​ 58,451 MidCon ​ ​ 7,825 ​ ​ 48,515 ​ ​ 32,698 ​ ​ 106,978 Rockies ​ ​ 6,927 ​ ​ 21,494 ​ ​ 25,796 ​ ​ 43,936 Bakken ​ ​ 2,542 ​ ​ 20,361 ​ ​ 25,102 ​ ​ 46,143 All other/eliminations ​ ​ (324) ​ ​ (2,240) ​ ​ (857) ​ ​ 4,887 Total ​ $ 92,239 ​ $ 323,887 ​ $ 370,524 ​ $ 686,533 ​ In the Water Services segment, the top three revenue producing regions are the Permian Basin, Eagle Ford and Marcellus/Utica, which collectively comprised 69%, 72%, 73% and 72% of segment revenue for the Current Quarter, Prior Quarter, Current Period and Prior Period, respectively. In the Water Infrastructure segment, the top two revenue producing regions are the Permian Basin and Bakken, which collectively comprised 82%, 81%, 86% and 82% of segment revenue for the Current Quarter, Prior Quarter, Current Period and Prior Period, respectively. In the Oilfield Chemicals segment, the top three revenue producing regions are the Permian Basin, Haynesville/E. Texas and MidCon, which collectively comprised 89%, 87%, 83% and 87% of segment revenue for the Current Quarter, Prior Quarter, Current Period and Prior Period, respectively.

INVENTORIES

INVENTORIES	6 Months Ended
	Jun. 30, 2020
INVENTORIES
INVENTORIES	NOTE 6—INVENTORIES Inventories, which are comprised of chemicals and materials available for resale and parts and consumables used in operations, are valued at the lower of cost and net realizable value, with cost determined under the weighted-average method. The significant components of inventory are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2020 December 31, 2019 ​ ​ (in thousands) Raw materials ​ $ 17,963 ​ $ 12,365 Finished goods ​ 20,223 ​ 24,724 Materials and supplies ​ — ​ 453 ​ ​ $ 38,186 ​ $ 37,542 ​ During the Current Quarter, Prior Quarter, Current Period and Prior Period, the Company recorded charges to the reserve for excess and obsolete inventory for $0.5 million, $0.1 million, $0.6 million, and $0.2 million, respectively, which were recognized within costs of revenue on the accompanying consolidated statements of operations. The Company’s inventory reserve was $4.4 million and $4.1 million as of June 30, 2020 and December 31, 2019, respectively. The reserve for excess and obsolete inventories is determined based on the Company’s historical usage of inventory on hand, as well as future expectations and the amount necessary to reduce the cost of the inventory to its estimated net realizable value.

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT	6 Months Ended
	Jun. 30, 2020
PROPERTY AND EQUIPMENT
PROPERTY AND EQUIPMENT	NOTE 7—PROPERTY AND EQUIPMENT Property and equipment consists of the following as of June 30, 2020 and December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2020 December 31, 2019 ​ ​ (in thousands) Land ​ $ 14,213 ​ $ 16,030 Buildings and leasehold improvements ​ 91,950 ​ 97,426 Vehicles and equipment ​ 38,390 ​ 53,819 Vehicles and equipment - finance lease ​ 1,031 ​ 1,291 Machinery and equipment ​ 631,501 ​ 659,835 Machinery and equipment - finance lease ​ 612 ​ 162 Pipelines ​ ​ 72,111 ​ ​ 69,327 Computer equipment and software ​ ​ 6,753 ​ ​ 8,051 Computer equipment and software - finance lease ​ 356 ​ 356 Office furniture and equipment ​ 1,027 ​ 1,157 Disposal wells ​ 51,162 ​ 64,149 Other ​ ​ — ​ ​ 497 Construction in progress ​ 21,202 ​ 43,279 ​ ​ 930,308 ​ 1,015,379 Less accumulated depreciation (1) ​ (537,323) ​ (562,986) Property and equipment held-for-sale, net ​ ​ — ​ ​ 885 Total property and equipment, net ​ $ 392,985 ​ $ 453,278 (1) Includes $1.5 million and $1.6 million of accumulated depreciation related to finance leases as of June 30, 2020 and December 31, 2019, respectively. Total depreciation and amortization expense related to property and equipment and finance leases presented in the table above, as well as amortization of intangible assets presented in Note 8 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ 2020 2019 2020 ​ 2019 ​ ​ (in thousands) Category ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation expense from property and equipment ​ $ 23,286 ​ $ 26,228 ​ $ 47,271 ​ $ 55,535 ​ Amortization expense from finance leases ​ ​ 39 ​ ​ 523 ​ ​ 116 ​ ​ 737 ​ Amortization expense from intangible assets ​ ​ 2,986 ​ ​ 2,969 ​ ​ 5,979 ​ ​ 5,938 ​ Accretion expense from asset retirement obligations ​ ​ 31 ​ ​ 29 ​ ​ (157) ​ ​ 57 ​ Total depreciation and amortization ​ $ 26,342 ​ $ 29,749 ​ $ 53,209 ​ $ 62,267 ​ ​ Long-lived assets are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. See Note 3 for impairment and abandonment of property and equipment during the Current Quarter and Prior Quarter. During the Current Period, the Company sold the remaining Canadian assets that were previously designated as held for sale at a loss of $0.1 million recognized within losses on sales of property, equipment and divestitures, net on the accompanying consolidated statements of operations.

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	6 Months Ended
	Jun. 30, 2020
GOODWILL AND OTHER INTANGIBLE ASSETS.
GOODWILL AND OTHER INTANGIBLE ASSETS	NOTE 8—GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill is evaluated for impairment on at least an annual basis, or more frequently if indicators of impairment exist. The annual impairment tests are based on Level 3 inputs (see Note 12). During the first quarter of 2020, the Company had triggering events in connection with the resulting significant adverse change to the demand for the Company’s services in connection with a significant decline in the price of oil and the related global economic impacts resulting from the OPEC+ disputes with increasing oil supply as well as the COVID-19 pandemic. This included uncertainty regarding oil prices and the length of the recovery following the significant market disruption in the oil and gas industry. As a result, the Company performed quantitative tests for reporting units in both the Water Services and Water Infrastructure segments using the income and market approaches, resulting in a full impairment to goodwill in both segments. The changes in the carrying amounts of goodwill by reportable segment as of June 30, 2020 and December 31, 2019 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water ​ Water ​ ​ ​ ​ Services Infrastructure Total ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance as of December 31, 2019 ​ ​ 186,468 ​ ​ 80,466 ​ ​ 266,934 Impairment ​ ​ (186,468) ​ ​ (80,466) ​ ​ (266,934) Balance as of June 30, 2020 ​ $ — ​ $ — ​ $ — ​ ​ The components of other intangible assets, net as of June 30, 2020 and December 31, 2019 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of June 30, 2020 ​ As of December 31, 2019 ​ Gross ​ Accumulated Net Gross Accumulated Net ​ ​ Value ​ Impairment ​ Amortization ​ Value ​ Value ​ Amortization ​ Value ​ ​ (in thousands) ​ (in thousands) Definite-lived ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships ​ $ 116,554 ​ $ — ​ $ (24,768) ​ $ 91,786 ​ $ 116,554 ​ $ (20,233) ​ $ 96,321 Patents ​ ​ 9,741 ​ ​ — ​ ​ (2,679) ​ ​ 7,062 ​ ​ 10,110 ​ ​ (2,420) ​ ​ 7,690 Other ​ ​ 7,234 ​ ​ — ​ ​ (5,712) ​ ​ 1,522 ​ 7,234 ​ (4,766) ​ 2,468 Total definite-lived ​ ​ 133,529 ​ ​ — ​ ​ (33,159) ​ ​ 100,370 ​ ​ 133,898 ​ ​ (27,419) ​ ​ 106,479 Indefinite-lived ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water rights ​ ​ 7,031 ​ ​ — ​ ​ — ​ ​ 7,031 ​ ​ 7,031 ​ ​ — ​ ​ 7,031 Trademarks ​ ​ 23,442 ​ ​ (9,082) ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ — ​ ​ 23,442 Total indefinite-lived ​ ​ 30,473 ​ ​ (9,082) ​ ​ — ​ ​ 21,391 ​ ​ 30,473 ​ ​ — ​ ​ 30,473 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total other intangible assets, net ​ $ 164,002 ​ $ (9,082) ​ $ (33,159) ​ $ 121,761 ​ $ 164,371 ​ $ (27,419) ​ $ 136,952 ​ Due to the triggering events discussed above, the Company tested all intangible assets for impairment during the first quarter of 2020. This resulted in $9.1 million of impairment to trademarks using the relief from royalty method, which was recorded in the Oilfield Chemicals segment. The weighted average amortization period for customer relationships, patents, and other definite lived assets was 10.2 years, 7.3 years, and 2.3 years, respectively, as of June 30, 2020. See Note 7 for the amortization expense during the Current Quarter, Prior Quarter, Current Period and Prior Period, respectively. The indefinite lived water rights and trademarks are generally subject to renewal every five ​ ​ ​ ​ ​ ​ Amount ​ ​ (in thousands) Remainder of 2020 ​ $ 5,681 Year ending December 31, 2021 ​ 10,466 Year ending December 31, 2022 ​ 10,252 Year ending December 31, 2023 ​ 10,180 Year ending December 31, 2024 ​ 10,111 Thereafter ​ ​ 53,680 Total ​ $ 100,370 ​

DEBT

DEBT	6 Months Ended
	Jun. 30, 2020
DEBT
DEBT	NOTE 9—DEBT Credit facility and revolving line of credit On November 1, 2017, SES Holdings and Select Energy Services, LLC (“Select LLC”) entered into a $300.0 million senior secured revolving credit facility (the “Credit Agreement”), by and among SES Holdings, as parent, Select LLC, as borrower and certain of SES Holdings’ subsidiaries, as guarantors, each of the lenders party thereto and Wells Fargo Bank, N.A., as administrative agent, issuing lender and swingline lender (the “Administrative Agent”). The Credit Agreement also has a sublimit of $40.0 million for letters of credit and a sublimit of $30.0 million for swingline loans. Subject to obtaining commitments from existing or new lenders, the Company has the option to increase the maximum amount under the Credit Agreement by $150.0 million during the first three years following the closing. The maturity date of the Credit Agreement is the earlier of (a) November 1, 2022, and (b) the earlier termination in whole of the Commitments pursuant to Section 2.1(b) of Article VII of the Credit Agreement. The Credit Agreement permits extensions of credit up to the lesser of $300.0 million and a borrowing base that is determined by calculating the amount equal to the sum of (i) 85% of the Eligible Billed Receivables (as defined in the Credit Agreement), plus (ii) 75% of Eligible Unbilled Receivables (as defined in the Credit Agreement), provided that this amount will not equal more than 35% of the borrowing base, plus (iii) the lesser of (A) the product of 70% multiplied by the value of Eligible Inventory (as defined in the Credit Agreement) at such time and (B) the product of 85% multiplied by the Net Recovery Percentage (as defined in the Credit Agreement) identified in the most recent Acceptable Appraisal of Inventory (as defined in the Credit Agreement), multiplied by the value of Eligible Inventory at such time, provided that this amount will not equal more than 30% of the borrowing base, minus (iv) the aggregate amount of Reserves (as defined in the Credit Agreement), if any, established by the Administrative Agent from time to time, including, if any, the amount of the Dilution Reserve (as defined in the Credit Agreement). The borrowing base is calculated on a monthly basis pursuant to a borrowing base certificate delivered by Select LLC to the Administrative Agent. Borrowings under the Credit Agreement bear interest, at Select LLC’s election, at either the (a) one-, two-, three- or six-month LIBOR (“Eurocurrency Rate”) or (b) the greatest of (i) the federal funds rate plus 0.5%, (ii) the one-month Eurocurrency Rate plus 1% and (iii) the Administrative Agent’s prime rate (the ”Base Rate”), in each case plus an applicable margin. Interest is payable monthly in arrears. The applicable margin for Eurocurrency Rate loans ranges from 1.50% to 2.00% and the applicable margin for Base Rate loans ranges from 0.50% to 1.00%, in each case, depending on Select LLC’s average excess availability under the Credit Agreement. During the continuance of a bankruptcy event of default, automatically and during the continuance of any other default, upon the Administrative Agent’s or the required lenders’ election, all outstanding amounts under the Credit Agreement will bear interest at 2.00% plus the otherwise applicable interest rate. ​ ​ ​ ​ ​ ​ ​ ​ Level ​ Average Excess Availability ​ Base Rate Margin ​ Eurocurrency Rate Margin ​ ​ ​ ​ ​ ​ ​ I ​ < 33% of the commitments ​ 1.00% ​ 2.00% II ​ < 66.67% of the commitments and ≥ 33.33% of the commitments ​ 0.75% ​ 1.75% III ​ ≥ 66.67% of the commitments ​ 0.50% ​ 1.50% ​ ​ ​ ​ ​ ​ Level ​ Average Revolver Usage ​ Unused Line Fee Percentage ​ ​ ​ ​ ​ I ​ ≥ 50% of the commitments ​ 0.250% II ​ < 50% of the commitments ​ 0.375% ​ The obligations under the Credit Agreement are guaranteed by SES Holdings and certain subsidiaries of SES Holdings and Select LLC and secured by a security interest in substantially all of the personal property assets of SES Holdings, Select LLC and their domestic subsidiaries. The Credit Agreement contains certain customary representations and warranties, affirmative and negative covenants and events of default. If an event of default occurs and is continuing, the lenders may declare all amounts outstanding under the Credit Agreement to be immediately due and payable. In addition, the Credit Agreement restricts SES Holdings’ and Select LLC’s ability to make distributions on, or redeem or repurchase, its equity interests, except for certain distributions, including distributions of cash so long as, both at the time of the distribution and after giving effect to the distribution, no default exists under the Credit Agreement and either (a) excess availability at all times during the preceding 30 consecutive days, on a pro forma basis and after giving effect to such distribution, is not less than the greater of (1) 25% of the lesser of (A) the maximum revolver amount and (B) the then-effective borrowing base and (2) $37.5 million or (b) if SES Holdings’ fixed charge coverage ratio is at least 1.0 to 1.0 on a pro forma basis, and excess availability at all times during the preceding 30 consecutive days, on a pro forma basis and after giving effect to such distribution, is not less than the greater of (1) 20% of the lesser of (A) the maximum revolver amount and (B) the then-effective borrowing base and (2) $30.0 million. Additionally, the Credit Agreement generally permits Select LLC to make distributions to allow Select Inc. to make payments required under the existing Tax Receivable Agreements. See “Note 13—Related Party Transactions” for further discussion of the Tax Receivable Agreements. The Credit Agreement also requires SES Holdings to maintain a fixed charge coverage ratio of at least 1.0 to 1.0 at any time availability under the Credit Agreement is less than the greater of (i) 10% of the lesser of (A) the maximum revolver amount and (B) the then-effective borrowing base and (ii) $15.0 million and continuing through and including the first day after such time that availability under the Credit Agreement has equaled or exceeded the greater of (i) 10% of the lesser of (A) the maximum revolver amount and (B) the then-effective borrowing base and (ii) $15.0 million for 60 consecutive calendar days. Certain lenders party to the Credit Agreement and their respective affiliates have from time to time performed, and may in the future perform, various financial advisory, commercial banking and investment banking services for the Company and its affiliates in the ordinary course of business for which they have received and would receive customary compensation. In addition, in the ordinary course of their various business activities, such parties and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers, and such investments and securities activities may involve the Company’s securities and/or instruments. The Company had no borrowings outstanding under the Credit Agreement as of June 30, 2020 and December 31, 2019. As of June 30, 2020 and December 31, 2019, the borrowing base under the Credit Agreement was $111.1 million and $214.6 million, respectively. The significant reduction in our borrowing base since December 31, 2019 was primarily driven by the meaningful reductions during the Current Quarter in our accounts receivable, which represent the primary collateral for the borrowing base. Debt issuance costs are amortized to interest expense over the life of the debt to which they pertain. Total unamortized debt issuance costs as of June 30, 2020 and December 31, 2019 were $1.6 million and $2.0 million, respectively. As these debt issuance costs relate to a revolving line of credit, they are presented as a deferred charge within other assets on the consolidated balance sheets. Amortization expense related to debt issuance costs was $0.2 million, $0.2 million, $0.3 million and $0.3 million for the Current Quarter, Prior Quarter, Current Period and Prior Period. The Company was in compliance with all debt covenants as of June 30, 2020.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Jun. 30, 2020
COMMITMENTS AND CONTINGENCIES
COMMITMENTS AND CONTINGENCIES	NOTE 10—COMMITMENTS AND CONTINGENCIES Litigation The Company is subject to a number of lawsuits and claims arising out of the normal conduct of its business. The ability to predict the ultimate outcome of such matters involves judgments, estimates and inherent uncertainties. Based on a consideration of all relevant facts and circumstances, including applicable insurance coverage, it is not expected that the ultimate outcome of any currently pending lawsuits or claims against the Company will have a material adverse effect on its consolidated financial position, results of operations or cash flows; however, there can be no assurance as to the ultimate outcome of these matters. As previously disclosed, certain subsidiaries acquired in the Rockwater merger are under investigation by the U.S. Attorney's Office for the Middle District of Pennsylvania and the U.S. Environmental Protection Agency. It is alleged that certain employees at some of the facilities altered emissions controls systems on less than 5% of the vehicles in the fleet in violation of the Clean Air Act. The Company is continuing to cooperate with the relevant authorities to resolve the matter, and while at this time no administrative, civil or criminal charges have been brought against the Company, the Company has accrued $4.3 million related to the settlement of this investigation. The Company does not believe that the ultimate resolution of this matter will be material to the Company’s financial statements. Self-Insured Reserves We are self-insured up to certain retention limits with respect to workers’ compensation, general liability and vehicle liability matters, and effective June 1, 2020, health insurance. We maintain accruals for self-insurance retentions that we estimate using third-party data and claims history.

EQUITY-BASED COMPENSATION

EQUITY-BASED COMPENSATION	6 Months Ended
	Jun. 30, 2020
EQUITY-BASED COMPENSATION
EQUITY-BASED COMPENSATION	NOTE 11—EQUITY-BASED COMPENSATION The SES Holdings 2011 Equity Incentive Plan, (“2011 Plan”) was approved by the board of managers of SES Holdings in April 2011. In conjunction with the Select 144A Offering, the Company adopted the Select Energy Services, Inc. 2016 Equity Incentive Plan (as amended, the “2016 Plan”) for employees, consultants and directors of the Company and its affiliates. Options that were outstanding under the 2011 Plan immediately prior to the Select 144A Offering were cancelled in exchange for new options granted under the 2016 Plan. On July 18, 2017, the Company’s board of directors approved the First Amendment to the 2016 Plan (the “ First Equity Plan Amendment”), which clarified the treatment of substitute awards under the 2016 Plan (including substitute awards that may be granted in connection with the Rockwater merger which occurred on November 1, 2017) and allowed for the assumption by the Company of shares eligible under any pre-existing stockholder-approved plan of an entity acquired by the Company or its affiliate (including the Rockwater Energy Solutions Inc. Amended and Restated 2017 Long Term Incentive Plan (the “Rockwater Equity Plan”)), in each case subject to the listing rules of the stock exchange on which the Company’s Class A Common Stock is listed. The effectiveness of the First Equity Plan Amendment was subject to approval by the Company's stockholders and the consummation of the transactions contemplated by the Merger Agreement for the Rockwater merger. Stockholders holding a majority of the Company’s outstanding common stock approved the First Equity Plan Amendment on July 18, 2017, and such amendment became effective on November 1, 2017 upon the consummation of the Rockwater merger. On February 28, 2020, the Company’s board of directors approved the Second Amendment to the 2016 Plan (the “Second Equity Plan Amendment”), which increases the number of shares of the Company’s Class A Common Stock that may be issued under the 2016 Plan by 4,000,000 shares. The effectiveness of the Second Equity Plan Amendment was subject to approval by the Company's stockholders. Stockholders holding a majority of the Company’s outstanding common stock approved the Second Equity Plan Amendment on May 8, 2020, and such amendment became immediately effective. Currently, the maximum number of shares reserved for issuance under the 2016 Plan, taking into account the Second Equity Plan Amendment, is approximately 13.3 million shares. For all share-based compensation award types, the Company accounts for forfeitures as they occur. Stock option awards Stock options were granted with an exercise price equal to or greater than the fair market value of a share of Class A Common Stock as of the date of grant. Certain awards granted during the years ended December 31, 2017 and 2016 in exchange for cancelled awards were immediately vested and fully exercisable on the date of grant because they were either granted in exchange for the cancellation of outstanding options granted under the 2011 Plan or the Rockwater Equity Plan, as applicable, that were fully vested and exercisable prior to such cancellation. The Company utilized the Monte Carlo option pricing model to determine fair value of the options granted during 2018, which incorporates assumptions to value equity-based awards. The risk-free interest rate is based on the U.S. Treasury yield curve in effect for the expected term of the option at the time of grant. The expected life of the options was based on the vesting period and term of the options awarded, which is ten years. No stock options were granted in 2019 or in the Current Period. A summary of the Company’s stock option activity and related information as of and for the Current Period is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2020 ​ ​ ​ ​ ​ ​ ​ Weighted-average ​ ​ ​ ​ ​ ​ ​ Weighted-average ​ Grant Date Value ​ Aggregate Intrinsic ​ Stock Options Exercise Price Term (Years) Value (in thousands) (a) Beginning balance, outstanding 3,797,319 ​ $ 15.95 ​ 4.2 ​ $ 509 Forfeited (22,437) ​ ​ 18.28 ​ ​ ​ ​ ​ Expired ​ (231,943) ​ ​ 14.27 ​ ​ ​ ​ ​ Ending balance, outstanding 3,542,939 ​ $ 16.05 ​ 3.3 ​ $ — Ending balance, exercisable ​ 3,539,564 ​ $ 15.22 ​ 3.3 ​ $ — Nonvested at June 30, 2020 ​ 3,375 ​ $ 22.22 ​ ​ ​ ​ ​ ​ (a) The Company recognized a nominal Restricted Stock Awards and Restricted Stock Units The value of the restricted stock awards and restricted stock units issued was established by the market price of the Class A Common Stock on the date of grant and is recorded as compensation expense ratably over the vesting term, which is generally one A summary of the Company’s restricted stock awards activity and related information for the Current Period is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2020 ​ ​ ​ ​ Weighted-average ​ Restricted Stock Awards Grant Date Fair Value Nonvested at December 31, 2019 ​ 1,518,193 ​ $ 10.08 Granted ​ 1,477,488 ​ ​ 5.80 Vested ​ (561,682) ​ ​ 11.92 Forfeited ​ (340,328) ​ ​ 7.55 Nonvested at June 30, 2020 ​ 2,093,671 ​ $ 6.98 ​ A summary of the Company’s restricted stock unit activity and related information for the Current Period is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2020 ​ ​ ​ ​ Weighted-average ​ Restricted Stock Units Grant Date Fair Value Nonvested at December 31, 2019 1,250 ​ $ 19.00 Vested (625) ​ ​ 20.00 Forfeited (625) ​ ​ 18.00 Nonvested at June 30, 2020 — ​ $ — ​ Performance Share Units (PSUs) During 2018 and 2019, the Company approved grants of performance share units (“PSUs”) that are subject to both performance-based and service-based vesting provisions. The number of shares of Class A Common Stock issued to a recipient upon vesting of the PSU will be calculated based on performance against certain metrics that relate to the Company’s return on asset performance over the January 1, 2018 through December 31, 2020 and January 1, 2019 through December 31, 2021 performance periods, respectively. The target number of shares of Class A Common Stock subject to each PSU granted in 2018 and 2019 is one; however, based on the achievement of performance criteria, the number of shares of Class A Common Stock that may be received in settlement of each PSU can range from zero to 1.75 times the target number. The PSUs become earned at the end of the performance period after the attainment of the performance level has been certified by the compensation committee, which will be no later than June 30, 2021 for the 2018 PSU grants, and June 30, 2022 for the 2019 PSU grants, assuming the minimum performance metrics are achieved. The target PSUs that become earned PSUs during the performance period will be determined in accordance with the following table: ​ ​ ​ ​ Return on Assets at Performance Period End Date ​ Percentage of Target PSUs Earned Less than 9.6% ​ 0% 9.6% ​ 50% 12% ​ 100% 14.4% ​ 175% ​ During 2020, the Company approved grants of PSUs that are subject to both performance-based and service-based vesting provisions related to (i) return on asset performance (“ROA”) in comparison to thirteen peer companies and (ii) Adjusted Free Cash Flow (“FCF”) performance percentage. The number of shares of Class A Common Stock issued to a recipient upon vesting of the PSUs will be calculated based on ROA and FCF performance over the period from January 1, 2020 through December 31, 2022. The target number of shares of Class A Common Stock subject to each PSU granted in 2020 is one; however, based on the achievement of performance criteria, the number of shares of Class A Common Stock that may be received in settlement of each PSU can range from zero to 1.75 times the target number. The PSUs become earned at the end of the performance period after the attainment of the performance level has been certified by the compensation committee, which will be no later than June 30, 2023 for the 2020 PSU grants, assuming the minimum performance metrics are achieved. The target PSUs that become earned connected with the ROA in comparison to other companies will be determined based on the Company’s Average Return on Assets (as defined in the applicable PSU agreement) relative to the Average Return on Assets of the peer companies (as defined in the applicable PSU agreement) in accordance with the following table, but only if the Company’s Average Return on Assets is equal to or greater than 5% during the performance period: ​ ​ ​ ​ Ranking Among Peer Group ​ Percentage of Target Amount Earned Outside of Top 10 ​ 0% Top 10 ​ 50% Top 7 ​ 100% Top 3 ​ 175% ​ The target PSUs that become earned in connection with the adjusted FCF performance percentage will be determined (as defined in the applicable PSU agreement) in accordance with the following table: ​ ​ ​ ​ Adjusted FCF Performance Percentage ​ Percentage of Target Amount Earned Less than 70% ​ 0% 70% ​ 50% 100% ​ 100% 130% ​ 175% ​ The fair value on the date the PSUs were issued during 2020, 2019 and 2018 was $4.4 million, $7.0 million and $5.9 million, respectively. Compensation expense related to the PSUs is determined by multiplying the number of shares of Class A Common Stock underlying such awards that, based on the Company’s estimate, are probable to vest, by the measurement-date (i.e., the last day of each reporting period date) fair value and recognized using the accelerated attribution method. During the Current Quarter, the Company revised the estimates for the PSUs granted in 2018 and 2019 and expected to vest to zero percent. The Company recognized a reduction to compensation expense of $0.7 million, compensation expense of $0.8 million, a reduction to compensation expense of $2.2 million and compensation expense of $1.7 million related to the PSUs for the Current Quarter, Prior Quarter, Current Period and Prior Period, respectively. As of June 30, 2020, the unrecognized compensation cost related to our unvested PSUs is estimated to be $3.3 million and is expected to be recognized over a weighted-average period of 1. years. However, this compensation cost will be adjusted as appropriate throughout the applicable performance periods. The following table summarizes the information about the performance share units outstanding as of June 30, 2020: ​ ​ ​ ​ ​ Performance Share Units Nonvested as of December 31, 2019 ​ 1,014,990 Target shares granted ​ 753,378 Target shares outstanding as of June 30, 2020 ​ 1,768,368 ​ Stock-Settled Incentive Awards Effective May 17, 2018, the Company approved grants of stock-settled incentive awards to certain key employees under the 2016 Plan that were subject to both market-based and service-based vesting provisions. These awards vested after a two-year service period and, if earned, settled in shares of Class A Common Stock. The ultimate amount earned was based on the achievement of the market metrics, which was based on the stock price of the Class A Common Stock at the vesting date, for which payout could range from 0% to 200%. Any award not earned on the vesting date was forfeited. The target amount that became earned during the performance period was determined in accordance with the following table: ​ ​ ​ ​ Stock Price at Vesting Date (1) ​ Percentage of Target Amount Earned Less than $20.00 ​ 0% At least $20.00, but less than $25.00 ​ 100% $25.00 or greater ​ 200% ​ (1) The stock price at vesting date equaled the greater of (i) the fair market value of a share of the Class A Common Stock on the vesting date, or (ii) the volume weighted average closing price of a share of the Class A Common Stock, as reported on the New York Stock Exchange, for the 30 trading days preceding the vesting date. The target amount of stock-settled incentive awards granted was $3.9 million. However, the ultimate settlement of the awards was in shares of Class A Common Stock with a fair market value equal to the earned amount, which could have ranged from 0% to 200% of the target amount depending on the stock price at vesting date. The earned amount was 0% and no shares of Class A Common Stock were issued. Compensation expense associated with the stock-settled incentive awards was recognized ratably over the corresponding requisite service period. The fair value of the stock-settled incentive awards was determined using a Monte Carlo option pricing model, similar to the Black-Scholes-Merton model, and adjusted for the specific characteristics of the awards. The key assumptions in the model included price, the expected volatility of our stock, risk-free interest rate based on U.S. Treasury yield curve, cross-correlations between us and our self-determined peer companies’ asset, equity and debt-to-equity volatility. The Company recognized stock compensation expense related to stock-settled incentive awards of $0.1 million, $0.1 million, $0.1 million and $0.3 million in the Current Quarter, Prior Quarter, Current Period and Prior Period, respectively. The following table summarizes the information about the stock-settled incentive awards as of June 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Award Value ​ Value at Target Being Recognized Nonvested as of December 31, 2019 ​ $ 2,937 ​ $ 1,122 Forfeited during 2020 ​ ​ (410) ​ ​ (157) Awards earned and forfeited as market condition not satisfied as of vesting date ​ ​ (2,527) ​ ​ — Cumulative expense recognized ​ $ — ​ $ 965 ​ Employee Stock Purchase Plan (ESPP) We have an Employee Stock Purchase Plan (“ESPP”) under which employees that have been continuously employed for at least one year may purchase shares of Class A Common Stock at a discount. The plan provides for four The following table summarizes ESPP activity (in thousands, except shares): ​ ​ ​ ​ ​ ​ For the six months ended ​ June 30, 2020 Cash received for shares issued ​ $ 42 Shares issued ​ ​ 7,640 ​ Share Repurchases During the Current Quarter and the Current Period, the Company repurchased 1,139,729 and 1,989,440 shares, respectively, of Class A Common Stock in the open market and repurchased 36,781 and 166,461 shares, respectively, of Class A Common Stock in connection with employee minimum tax withholding requirements for units vested under the 2016 Plan. All repurchased shares were retired. During the Current Quarter, the repurchases were accounted for as a decrease to paid-in-capital of $4.0 million and a decrease to Class A Common Stock of approximately $12,000. During the Current Period, the repurchases were accounted for as a decrease to paid-in-capital of $10.6 million and a decrease to Class A Common Stock of approximately $22,000. In the Prior Quarter, the Company repurchased zero shares in the open market and repurchased 26,716 shares in connection with employee minimum tax withholding requirements. In the Prior Period, the Company repurchased 82,092 shares in the open market and repurchased 70,410 shares in connection with employee minimum tax withholding requirements.

FAIR VALUE MEASUREMENT

FAIR VALUE MEASUREMENT	6 Months Ended
	Jun. 30, 2020
FAIR VALUE MEASUREMENT
FAIR VALUE MEASUREMENT	NOTE 12—FAIR VALUE MEASUREMENT The Company utilizes fair value measurements to measure assets and liabilities in a business combination or assess impairment and abandonment of property and equipment, intangible assets and goodwill. Fair value is defined as the amount at which an asset (or liability) could be bought (or incurred) or sold (or settled) in an orderly transaction between market participants at the measurement date. Further, ASC 820, Fair Value Measurements, establishes a framework for measuring fair value, establishes a fair value hierarchy based on the quality of inputs used to measure fair value, and includes certain disclosure requirements. Fair value estimates are based on either (i) actual market data or (ii) assumptions that other market participants would use in pricing an asset or liability, including estimates of risk. ASC 820 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy categorizes assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement. The three levels are defined as follows: Level 1 Level 2 Level 3 A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. There were no transfers into, or out of, the three levels of the fair value hierarchy for the six months ended June 30, 2020 or the year ended December 31, 2019. The following table presents information about the Company’s assets measured at fair value on a non-recurring basis as of March 31, 2020 and June 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measurements Using ​ Carrying ​ ​ ​ ​ ​ Measurement Date Level 1 Level 2 Level 3 Value (1) Impairment ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Goodwill ​ March 31 ​ $ — ​ $ — ​ $ — ​ $ 266,934 ​ $ 266,934 Trademark ​ March 31 ​ ​ — ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ 9,082 Property and equipment ​ March 31 ​ ​ — ​ ​ — ​ ​ 176 ​ ​ 3,360 ​ ​ 3,184 Property and equipment ​ June 30 ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,726 ​ ​ 4,726 (1) Amount represents carrying value at the date of assessment. See Note 3 – Impairments and Other Costs, for a discussion of the impairment to goodwill, trademark and property and equipment presented in the table above. Other fair value considerations The carrying values of the Company’s current financial instruments, which include cash and cash equivalents, accounts receivable trade and accounts payable, approximate their fair value as of June 30, 2020 and December 31, 2019, due to the short-term maturity of these instruments. The Company did not have any debt as of June 30, 2020 or December 31, 2019. The estimated fair values of the Company’s financial instruments are not necessarily indicative of the amounts that would be realized in a current market exchange.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	6 Months Ended
	Jun. 30, 2020
RELATED PARTY TRANSACTIONS
RELATED PARTY TRANSACTIONS	NOTE 13—RELATED-PARTY TRANSACTIONS The Company considers its related parties to be those stockholders who are beneficial owners of more than 5.0% of its common stock, executive officers, members of its board of directors or immediate family members of any of the foregoing persons and an unconsolidated joint venture. The Company has entered into a number of transactions with related parties. In accordance with the Company’s related persons transactions policy, the audit committee of the Company’s board of directors regularly reviews these transactions. However, the Company’s results of operations may have been different if these transactions were conducted with non-related parties. For more information regarding the Company’s policies and procedures for review of related party transactions, see the Company’s Definitive Proxy Statement for the 2020 Annual Meeting of Stockholders filed with the SEC on March 27, 2020. During the Current Quarter, sales to related parties were $0.2 million and purchases from related-party vendors were $1.5 million. These purchases consisted of $1.4 million relating to the rental of certain equipment or other services used in operations and $0.1 million relating to purchases of property and equipment. During the Prior Quarter, sales to related parties were $3.6 million and purchases from related-party vendors were $6.4 million. These purchases consisted of $5.6 million relating to the rental of certain equipment or other services used in operations, $0.4 million relating to purchases of property and equipment and $0.4 million relating to management, consulting and other services. During the Current Period, sales to related parties were $2.6 million and purchases from related-party vendors were $5.7 million. These purchases consisted of $5.1 million relating to the rental of certain equipment or other services used in operations, $0.3 million relating to purchases of property and equipment, $0.2 million relating to management, consulting and other services and $0.1 million related to inventory and consumables. During the Prior Period, sales to related parties were $9.9 million and purchases from related-party vendors were $12.4 million. These purchases consisted of $9.5 million relating to the rental of certain equipment or other services used in operations, $1.9 million relating to purchases of property and equipment and $1.0 million relating to management, consulting and other services. Tax Receivable Agreements In connection with the Select 144A Offering, the Company entered into the Tax Receivable Agreements with the TRA Holders. The first of the Tax Receivable Agreements, which the Company entered into with Legacy Owner Holdco and Crestview Partners II GP, L.P. (“Crestview GP”), generally provides for the payment by the Company to such TRA Holders of 85% of the net cash savings, if any, in U.S. federal, state and local income and franchise tax that the Company actually realizes (computed using simplifying assumptions to address the impact of state and local taxes) or is deemed to realize in certain circumstances in periods after the Select 144A Offering as a result of, as applicable to each such TRA Holder, (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 SES Holdings LLC Units in connection with the Select 144A Offering or pursuant to the exercise of the Exchange Right or the Company’s Call Right and (ii) 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 such Tax Receivable Agreement. The second of the Tax Receivable Agreements, which the Company entered into with an affiliate of the Contributing Legacy Owners and Crestview GP, generally provides for the payment by the Company to such TRA Holders of 85% of the net cash savings, if any, in U.S. federal, state and local income and franchise tax that the Company actually realizes (computed using simplifying assumptions to address the impact of state and local taxes) or is deemed to realize in certain circumstances in periods after the Select 144A Offering as a result of, as applicable to each such TRA Holder, (i) any net operating losses available to the Company as a result of certain reorganization transactions entered into in connection with the Select 144A Offering and (ii) imputed interest deemed to be paid by the Company as a result of any payments the Company makes under such Tax Receivable Agreement. On July 18, 2017, the Company’s board of directors approved amendments to each of the Tax Receivable Agreements revising the definition of a “change of control” for purposes of the Tax Receivable Agreements and acknowledging that the Rockwater merger would not result in such a change of control.

INCOME TAXES

INCOME TAXES	6 Months Ended
	Jun. 30, 2020
INCOME TAXES
INCOME TAXES	NOTE 14—INCOME TAXES The Company’s income tax information is presented in the table below. The effective tax rate is different than the 21% standard Federal rate due to net income allocated to noncontrolling interests, state income taxes and valuation allowances. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ 2020 ​ 2019 ​ 2020 ​ 2019 ​ ​ (in thousands) Current income tax (benefit) expense ​ $ (607) ​ $ 405 ​ $ (679) ​ $ 583 Deferred income tax expense ​ ​ 477 ​ ​ 166 ​ ​ 385 ​ ​ 166 Total income tax (benefit) expense ​ $ (130) ​ $ 571 ​ $ (294) ​ $ 749 Effective Tax Rate ​ ​ 0.2% ​ ​ 6.6% ​ ​ 0.1% ​ ​ 7.3% ​ On March 27, 2020, the CARES Act was enacted. The CARES Act includes, among other things, certain income tax provisions for businesses. The Company recognized an income tax benefit of $0.5 million during the Current Period, as a result of the net operating loss carryback and interest expense limitation provisions of the CARES Act. ​

NONCONTROLLING INTERESTS

NONCONTROLLING INTERESTS	6 Months Ended
	Jun. 30, 2020
NONCONTROLLING INTERESTS
NONCONTROLLING INTERESTS	NOTE 15—NONCONTROLLING INTERESTS The Company’s noncontrolling interests fall into two categories as follows: ● Noncontrolling interests attributable to joint ventures formed for water-related services. ● Noncontrolling interests attributable to holders of Class B Common Stock. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ ​ June 30, 2020 December 31, 2019 ​ ​ ​ (in thousands) Noncontrolling interests attributable to joint ventures formed for water-related services ​ ​ $ 1,960 $ 2,674 Noncontrolling interests attributable to holders of Class B Common Stock ​ ​ ​ 119,205 172,961 Total noncontrolling interests ​ ​ $ 121,165 $ 175,635 ​ For all periods presented, there were no changes to Select’s ownership interest in joint ventures formed for water-related services, with the exception of a divestiture of a 50% owned joint venture that eliminated $0.1 million of noncontrolling interest. Additionally, during the Current Quarter and Prior Quarter, there were changes in Select’s ownership interest in SES Holdings LLC. The effects of the changes in Select’s ownership interest in SES Holdings LLC is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, ​ ​ 2020 2019 ​ ​ ​ (in thousands) Net (loss) income attributable to Select Energy Services, Inc. ​ ​ $ (290,160) $ 7,335 Transfers (to) from noncontrolling interests: ​ ​ ​ ​ ​ Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures ​ ​ 1,911 3,540 Increase in additional paid-in capital as a result of issuance of common stock due to vesting of restricted stock units ​ ​ ​ 1 ​ ​ 4 Decrease in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units ​ ​ (1,405) (25) Increase in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued ​ ​ ​ 4 ​ ​ 2 Change to equity from net (loss) income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests ​ ​ $ (289,649) $ 10,856 ​

(LOSS) EARNINGS PER SHARE

(LOSS) EARNINGS PER SHARE	6 Months Ended
	Jun. 30, 2020
(LOSS) EARNINGS PER SHARE
(LOSS) EARNINGS PER SHARE	NOTE 16—(LOSS) EARNINGS PER SHARE (Loss) earnings per share are based on the amount of (loss) income allocated to the stockholders and the weighted-average number of shares outstanding during the period for each class of common stock. Outstanding options to purchase 3,542,939, 2,972,967, 3,542,939 and 2,976,537 shares of Class A Common Stock are not included in the calculation of diluted weighted-average shares outstanding for the Current Quarter, Prior Quarter, Current Period and Prior Period, respectively, as the effect is antidilutive. The following tables present the Company’s calculation of basic and diluted (loss) earnings per share for the Current and Prior Quarter and the Current and Prior Period (dollars in thousands, except share and per share amounts): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended June 30, 2020 ​ Three months ended June 30, 2019 ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Services, Inc. Class A Class B Services, Inc. Class A Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net (loss) income ​ $ (53,044) ​ ​ ​ ​ ​ ​ ​ $ 8,068 ​ ​ ​ ​ ​ ​ Net loss (income) attributable to noncontrolling interests ​ ​ 8,746 ​ ​ ​ ​ ​ ​ ​ ​ (1,868) ​ ​ ​ ​ ​ ​ Net (loss) income attributable to Select Energy Services, Inc. — basic ​ ​ (44,298) ​ $ (44,298) ​ $ — ​ ​ 6,200 ​ $ 6,200 ​ $ — Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of restricted stock ​ ​ — ​ ​ — ​ ​ — ​ ​ 9 ​ ​ 9 ​ ​ — Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of stock options ​ ​ — ​ ​ — ​ ​ — ​ ​ 3 ​ ​ 3 ​ ​ — Net (loss) income attributable to Select Energy Services, Inc. — diluted ​ $ (44,298) ​ $ (44,298) ​ $ — ​ $ 6,212 ​ $ 6,212 ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 84,937,043 ​ ​ 16,221,101 ​ ​ ​ ​ ​ 78,544,502 ​ ​ 26,026,843 Dilutive effect of restricted stock ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 471,542 ​ ​ — Dilutive effect of stock options ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 150,889 ​ ​ — Dilutive effect of ESPP ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 102 ​ ​ — Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 84,937,043 ​ ​ 16,221,101 ​ ​ ​ ​ ​ 79,167,035 ​ ​ 26,026,843 (Loss) earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ (0.52) ​ $ — ​ ​ ​ ​ $ 0.08 ​ $ — Diluted ​ ​ ​ ​ $ (0.52) ​ $ — ​ ​ ​ ​ $ 0.08 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six months ended June 30, 2020 ​ Six months ended June 30, 2019 ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Services, Inc. Class A Class B Services, Inc. Class A Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net (loss) income ​ $ (344,264) ​ ​ ​ ​ ​ ​ ​ $ 9,468 ​ ​ ​ ​ ​ ​ Net loss (income) attributable to noncontrolling interests ​ ​ 54,104 ​ ​ ​ ​ ​ ​ ​ ​ (2,133) ​ ​ ​ ​ ​ ​ Net (loss) income attributable to Select Energy Services, Inc. — basic ​ ​ (290,160) ​ $ (290,160) ​ $ — ​ ​ 7,335 ​ $ 7,335 ​ $ — Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of restricted stock ​ ​ — ​ ​ — ​ ​ — ​ ​ 8 ​ ​ 8 ​ ​ — Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of stock options ​ ​ — ​ ​ — ​ ​ — ​ ​ 2 ​ ​ 2 ​ ​ — Net (loss) income attributable to Select Energy Services, Inc. — diluted ​ $ (290,160) ​ $ (290,160) ​ $ — ​ $ 7,345 ​ $ 7,345 ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 85,520,935 ​ ​ 16,221,101 ​ ​ ​ ​ ​ 78,533,761 ​ ​ 26,026,843 Dilutive effect of restricted stock ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 351,780 ​ ​ — Dilutive effect of stock options ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 78,353 ​ ​ — Dilutive effect of ESPP ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 195 ​ ​ — Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 85,520,935 ​ ​ 16,221,101 ​ ​ ​ ​ ​ 78,964,089 ​ ​ 26,026,843 (Loss) earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ (3.39) ​ $ — ​ ​ ​ ​ $ 0.09 ​ $ — Diluted ​ ​ ​ ​ $ (3.39) ​ $ — ​ ​ ​ ​ $ 0.09 ​ $ — ​

SEGMENT INFORMATION

SEGMENT INFORMATION	6 Months Ended
	Jun. 30, 2020
SEGMENT INFORMATION
SEGMENT INFORMATION	NOTE 17—SEGMENT INFORMATION Select Inc. is a leading provider of comprehensive water-management solutions to the oil and gas industry in the U.S. The Company’s services are offered through three reportable segments. Reportable segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the CODM in deciding how to allocate resources and assess performance. The Company’s CODM assesses performance and allocates resources on the basis of the three reportable segments. Corporate and other expenses that do not individually meet the criteria for segment reporting are reported separately as Corporate or Other. Each reportable segment is led by a separate manager that reports directly to the Company’s CODM. The Company’s CODM assesses performance and allocates resources on the basis of the following three reportable segments: Water Services Water Infrastructure ​ Oilfield Chemicals ​ The results of our service lines divested during 2019, including the operations of our Affirm subsidiary, our sand hauling operations and our Canadian operations, are combined in the “Other” category. ​ Financial information by segment for the Current and Prior Quarter and the Current and Prior Period is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended June 30, 2020 ​ ​ ​ Loss Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 56,090 ​ $ (22,518) ​ $ 15,880 ​ $ (48) Water Infrastructure ​ ​ 15,439 ​ ​ (11,037) ​ ​ 7,024 ​ ​ (205) Oilfield Chemicals ​ ​ 21,174 ​ ​ (7,216) ​ ​ 2,604 ​ ​ 1,614 Other ​ ​ — ​ ​ (38) ​ ​ — ​ ​ — Eliminations ​ (464) ​ — ​ — ​ — Loss from operations ​ ​ ​ (40,809) ​ ​ ​ ​ Corporate ​ — ​ (6,996) ​ 834 ​ — Interest expense, net ​ — ​ (513) ​ — ​ — Other expense, net ​ — ​ (4,856) ​ — ​ — ​ ​ $ 92,239 ​ $ (53,174) ​ $ 26,342 ​ $ 1,361 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended June 30, 2019 ​ ​ ​ Income (loss) Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 202,997 ​ $ 16,234 ​ $ 21,024 ​ $ 9,489 Water Infrastructure ​ ​ 51,719 ​ ​ 3,202 ​ ​ 6,072 ​ ​ 11,542 Oilfield Chemicals ​ ​ 62,997 ​ ​ 4,424 ​ ​ 1,747 ​ ​ 2,132 Other ​ ​ 9,403 ​ ​ 673 ​ ​ — ​ ​ 3 Eliminations ​ (3,229) ​ — ​ — ​ — Income from operations ​ ​ ​ 24,533 ​ ​ ​ ​ Corporate ​ — ​ (13,354) ​ 906 ​ — Interest expense, net ​ — ​ (839) ​ — ​ — Other expense, net ​ — ​ (1,701) ​ — ​ — ​ ​ $ 323,887 ​ $ 8,639 ​ $ 29,749 ​ $ 23,166 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2020 ​ ​ ​ Loss Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 206,242 ​ $ (218,418) ​ $ 33,036 ​ $ 1,219 Water Infrastructure ​ ​ 73,323 ​ ​ (93,114) ​ ​ 14,052 ​ ​ 2,363 Oilfield Chemicals ​ ​ 92,202 ​ ​ (10,112) ​ ​ 4,602 ​ ​ 4,504 Other ​ ​ — ​ ​ (13) ​ ​ — ​ ​ 325 Eliminations ​ (1,243) ​ — ​ — ​ — Loss from operations ​ ​ ​ (321,657) ​ ​ ​ ​ Corporate ​ — ​ (16,979) ​ 1,519 ​ — Interest expense, net ​ — ​ (844) ​ — ​ — Other expense, net ​ — ​ (5,078) ​ — ​ — ​ ​ $ 370,524 ​ $ (344,558) ​ $ 53,209 ​ $ 8,411 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2019 ​ ​ ​ Income (loss) Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 423,877 ​ $ 39,894 ​ $ 42,286 ​ $ 22,615 Water Infrastructure ​ ​ 105,335 ​ ​ 7,003 ​ ​ 12,161 ​ ​ 28,780 Oilfield Chemicals ​ ​ 130,116 ​ ​ 6,437 ​ ​ 4,200 ​ ​ 3,352 Other ​ ​ 33,073 ​ ​ (5,850) ​ ​ 1,714 ​ ​ 64 Eliminations ​ (5,868) ​ — ​ — ​ — Income from operations ​ ​ ​ 47,484 ​ ​ ​ ​ Corporate ​ — ​ (29,672) ​ 1,906 ​ — Interest expense, net ​ — ​ (1,932) ​ — ​ — Other expense, net ​ — ​ (5,663) ​ — ​ — ​ ​ $ 686,533 ​ $ 10,217 ​ $ 62,267 ​ $ 54,811 ​ Total assets by segment as of June 30, 2020 and December 31, 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ June 30, 2020 December 31, 2019 ​ ​ (in thousands) Water Services ​ $ 559,889 ​ $ 831,123 Water Infrastructure ​ 194,622 ​ 314,026 Oilfield Chemicals ​ 149,727 ​ 192,224 Other ​ ​ 7,076 ​ ​ 10,247 ​ ​ $ 911,314 ​ $ 1,347,620 ​

SIGNIFICANT ACCOUNTING POLICI_2

SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 2020
SIGNIFICANT ACCOUNTING POLICIES
Use of estimates	Use of estimates : The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, the Company evaluates its estimates, including those related to the recoverability of long-lived assets and intangibles, useful lives used in depreciation and amortization, uncollectible accounts receivable, inventory, income taxes, self-insurance liabilities, share-based compensation, contingent liabilities and the incremental borrowing rate for leases. The Company bases its estimates on historical and other pertinent information that are believed to be reasonable under the circumstances. The accounting estimates used in the preparation of the consolidated financial statements may change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes.
Allowance for doubtful accounts	Allowance for credit losses: ​ The following table presents the changes to the allowance for the Current Period: ​ ​ ​ ​ ​ ​ ​ Six months ended June 30, 2020 ​ ​ (in thousands) Balance at beginning of period ​ $ 5,773 Increase to allowance based on a percent of Current Period revenue ​ 741 Adjustment based on aged receivable analysis ​ 4,069 Charge-offs ​ ​ (1,109) Balance at June 30, 2020 ​ $ 9,474 ​
Asset retirement obligations	Asset retirement obligations: ​ ​ ​ ​ ​ ​ Six months ended June 30, 2020 ​ (in thousands) Balance at beginning of period $ 1,527 Accretion expense, included in depreciation and amortization expense ​ 62 Disposals ​ (219) Payments ​ ​ (101) Balance at June 30, 2020 $ 1,269 ​ We review the adequacy of our ARO liabilities whenever indicators suggest that the estimated cash flows underlying the liabilities have changed. The Company’s ARO liabilities are included in accrued expenses and other current liabilities and other long-term liabilities in the accompanying consolidated balance sheets.
Lessor income	Lessor Income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ ​ 2020 2019 2020 ​ 2019 ​ ​ ​ ​ (in thousands) ​ (in thousands) ​ Category Classification ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lessor income Cost of sales ​ $ 96 ​ $ 69 ​ $ 212 ​ $ 180 ​ Sublease income Lease abandonment costs and Cost of sales ​ ​ 335 ​ ​ 390 ​ ​ 736 ​ ​ 762 ​ ​ The Company also generates short-term equipment rental revenue. See Note 5—Revenue for a discussion of revenue recognition for the accommodations and rentals business.
Operating leases	Operating leases: lease liabilities
Defined contribution plan	​ Defined Contribution Plan: ​ Payroll Tax Deferral:
Payroll Tax Deferral	Payroll Tax Deferral:
Recent accounting pronouncements:	Recent accounting pronouncements : In June 2016, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments debt expense from trade receivables, as well as updating future expectations, the adoption of the new standard in the first quarter of 2020 did not have a material impact to the Company’s financial statements. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740)

SIGNIFICANT ACCOUNTING POLICI_3

SIGNIFICANT ACCOUNTING POLICIES (Tables)	6 Months Ended
	Jun. 30, 2020
SIGNIFICANT ACCOUNTING POLICIES
Schedule of change in allowance for doubtful accounts	​ ​ ​ ​ ​ ​ ​ Six months ended June 30, 2020 ​ ​ (in thousands) Balance at beginning of period ​ $ 5,773 Increase to allowance based on a percent of Current Period revenue ​ 741 Adjustment based on aged receivable analysis ​ 4,069 Charge-offs ​ ​ (1,109) Balance at June 30, 2020 ​ $ 9,474
Summary of change in asset retirement obligations	​ ​ ​ ​ ​ ​ Six months ended June 30, 2020 ​ (in thousands) Balance at beginning of period $ 1,527 Accretion expense, included in depreciation and amortization expense ​ 62 Disposals ​ (219) Payments ​ ​ (101) Balance at June 30, 2020 $ 1,269
Schedule of lessor income	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ ​ 2020 2019 2020 ​ 2019 ​ ​ ​ ​ (in thousands) ​ (in thousands) ​ Category Classification ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lessor income Cost of sales ​ $ 96 ​ $ 69 ​ $ 212 ​ $ 180 ​ Sublease income Lease abandonment costs and Cost of sales ​ ​ 335 ​ ​ 390 ​ ​ 736 ​ ​ 762 ​

IMPAIRMENTS AND OTHER COSTS (Ta

IMPAIRMENTS AND OTHER COSTS (Tables)	6 Months Ended
	Jun. 30, 2020
IMPAIRMENTS AND OTHER COSTS
Schedule of impairment, severance, yard closure and lease abandonment costs	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ 2020 2019 ​ 2020 ​ 2019 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impairment of goodwill and trademark ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ — ​ $ — ​ $ 186,468 ​ $ — ​ Water Infrastructure ​ ​ — ​ ​ — ​ ​ 80,466 ​ ​ — ​ Oilfield Chemicals ​ ​ — ​ ​ — ​ ​ 9,082 ​ ​ — ​ Other ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,396 ​ Total impairment of goodwill and trademark ​ $ — ​ $ — ​ $ 276,016 ​ $ 4,396 ​ ​ For a discussion of the impairments to goodwill and trademark, See Note 8—Goodwill and Other Intangible Assets. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ ​ 2020 2019 ​ 2020 ​ 2019 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impairment and abandonment of property and equipment ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 1,396 ​ $ — ​ $ 3,894 ​ $ — ​ Water Infrastructure ​ ​ 3,330 ​ ​ — ​ ​ 4,016 ​ ​ — ​ Other ​ ​ — ​ ​ 374 ​ ​ — ​ ​ 893 ​ Total impairment and abandonment of property and equipment ​ $ 4,726 ​ $ 374 ​ $ 7,910 ​ $ 893 ​ ​ During the Current Quarter and Current Period, the Company recorded an impairment of $4.7 million and $7.9 million, respectively, related to certain equipment that was determined to be obsolete. During the Prior Quarter and Prior Period, the Company recorded an impairment of $0.4 million and $0.9 million, respectively, of Canadian property and equipment to write down the carrying value based on the expected future sale proceeds at that time. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ ​ 2020 2019 ​ 2020 ​ 2019 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Severance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 2,746 ​ $ — ​ $ 4,569 ​ $ — ​ Water Infrastructure ​ ​ 212 ​ ​ — ​ ​ 500 ​ ​ — ​ Oilfield Chemicals ​ ​ 693 ​ ​ — ​ ​ 813 ​ ​ — ​ Other ​ ​ 15 ​ ​ — ​ ​ 1,286 ​ ​ 1,680 ​ Total severance expense ​ $ 3,666 ​ $ — ​ $ 7,168 ​ $ 1,680 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Yard closure costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 695 ​ $ — ​ $ 2,645 ​ $ — ​ Oilfield Chemicals ​ ​ 316 ​ ​ — ​ ​ 316 ​ ​ — ​ Total yard closure costs ​ $ 1,011 ​ $ — ​ $ 2,961 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease abandonment costs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 848 ​ $ 218 ​ $ 1,783 ​ $ 447 ​ Water Infrastructure ​ ​ — ​ ​ — ​ ​ 51 ​ ​ — ​ Oilfield Chemicals ​ ​ 42 ​ ​ 7 ​ ​ 42 ​ ​ 7 ​ Other ​ ​ (22) ​ ​ (42) ​ ​ (55) ​ ​ 802 ​ Total lease abandonment costs ​ $ 868 ​ $ 183 ​ $ 1,821 ​ $ 1,256 ​

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	6 Months Ended
	Jun. 30, 2020
Well Chemical Services Acquisition
Schedule Of consideration transferred and the estimated fair value of identified assets acquired and liabilities	​ ​ ​ ​ ​ Purchase price allocation Amount Consideration transferred (in thousands) Cash paid ​ $ 10,000 Total consideration transferred ​ 10,000 Less: identifiable assets acquired and liabilities assumed ​ Inventory ​ 5,221 Property and equipment ​ 4,473 Customer relationships ​ 476 Current liabilities ​ ​ (170) Total identifiable net assets acquired ​ 10,000 Fair value allocated to net assets acquired ​ $ 10,000

REVENUE (Tables)

REVENUE (Tables)	6 Months Ended
	Jun. 30, 2020
REVENUE
Schedule of disaggregation of revenue by geographic location	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ 2020 2019 2020 ​ 2019 ​ ​ (in thousands) Geographic Region ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Permian Basin ​ $ 36,638 ​ $ 148,118 ​ $ 174,636 ​ $ 310,783 Eagle Ford ​ ​ 10,672 ​ ​ 41,033 ​ ​ 46,336 ​ ​ 79,759 Haynesville/E. Texas ​ ​ 14,708 ​ ​ 18,314 ​ ​ 33,723 ​ ​ 35,596 Marcellus/Utica ​ ​ 13,251 ​ ​ 28,292 ​ ​ 33,090 ​ ​ 58,451 MidCon ​ ​ 7,825 ​ ​ 48,515 ​ ​ 32,698 ​ ​ 106,978 Rockies ​ ​ 6,927 ​ ​ 21,494 ​ ​ 25,796 ​ ​ 43,936 Bakken ​ ​ 2,542 ​ ​ 20,361 ​ ​ 25,102 ​ ​ 46,143 All other/eliminations ​ ​ (324) ​ ​ (2,240) ​ ​ (857) ​ ​ 4,887 Total ​ $ 92,239 ​ $ 323,887 ​ $ 370,524 ​ $ 686,533

INVENTORIES (Tables)

INVENTORIES (Tables)	6 Months Ended
	Jun. 30, 2020
INVENTORIES
Schedule of inventory	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2020 December 31, 2019 ​ ​ (in thousands) Raw materials ​ $ 17,963 ​ $ 12,365 Finished goods ​ 20,223 ​ 24,724 Materials and supplies ​ — ​ 453 ​ ​ $ 38,186 ​ $ 37,542

PROPERTY AND EQUIPMENT (Tables)

PROPERTY AND EQUIPMENT (Tables)	6 Months Ended
	Jun. 30, 2020
PROPERTY AND EQUIPMENT
Schedule of property and equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ June 30, 2020 December 31, 2019 ​ ​ (in thousands) Land ​ $ 14,213 ​ $ 16,030 Buildings and leasehold improvements ​ 91,950 ​ 97,426 Vehicles and equipment ​ 38,390 ​ 53,819 Vehicles and equipment - finance lease ​ 1,031 ​ 1,291 Machinery and equipment ​ 631,501 ​ 659,835 Machinery and equipment - finance lease ​ 612 ​ 162 Pipelines ​ ​ 72,111 ​ ​ 69,327 Computer equipment and software ​ ​ 6,753 ​ ​ 8,051 Computer equipment and software - finance lease ​ 356 ​ 356 Office furniture and equipment ​ 1,027 ​ 1,157 Disposal wells ​ 51,162 ​ 64,149 Other ​ ​ — ​ ​ 497 Construction in progress ​ 21,202 ​ 43,279 ​ ​ 930,308 ​ 1,015,379 Less accumulated depreciation (1) ​ (537,323) ​ (562,986) Property and equipment held-for-sale, net ​ ​ — ​ ​ 885 Total property and equipment, net ​ $ 392,985 ​ $ 453,278 (1) Includes $1.5 million and $1.6 million of accumulated depreciation related to finance leases as of June 30, 2020 and December 31, 2019, respectively.
Schedule of amortization of intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ 2020 2019 2020 ​ 2019 ​ ​ (in thousands) Category ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation expense from property and equipment ​ $ 23,286 ​ $ 26,228 ​ $ 47,271 ​ $ 55,535 ​ Amortization expense from finance leases ​ ​ 39 ​ ​ 523 ​ ​ 116 ​ ​ 737 ​ Amortization expense from intangible assets ​ ​ 2,986 ​ ​ 2,969 ​ ​ 5,979 ​ ​ 5,938 ​ Accretion expense from asset retirement obligations ​ ​ 31 ​ ​ 29 ​ ​ (157) ​ ​ 57 ​ Total depreciation and amortization ​ $ 26,342 ​ $ 29,749 ​ $ 53,209 ​ $ 62,267 ​

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	6 Months Ended
	Jun. 30, 2020
GOODWILL AND OTHER INTANGIBLE ASSETS.
Schedule of changes in the carrying amounts of goodwill by reportable segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water ​ Water ​ ​ ​ ​ Services Infrastructure Total ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance as of December 31, 2019 ​ ​ 186,468 ​ ​ 80,466 ​ ​ 266,934 Impairment ​ ​ (186,468) ​ ​ (80,466) ​ ​ (266,934) Balance as of June 30, 2020 ​ $ — ​ $ — ​ $ — ​ ​
Summary of components of other intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of June 30, 2020 ​ As of December 31, 2019 ​ Gross ​ Accumulated Net Gross Accumulated Net ​ ​ Value ​ Impairment ​ Amortization ​ Value ​ Value ​ Amortization ​ Value ​ ​ (in thousands) ​ (in thousands) Definite-lived ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships ​ $ 116,554 ​ $ — ​ $ (24,768) ​ $ 91,786 ​ $ 116,554 ​ $ (20,233) ​ $ 96,321 Patents ​ ​ 9,741 ​ ​ — ​ ​ (2,679) ​ ​ 7,062 ​ ​ 10,110 ​ ​ (2,420) ​ ​ 7,690 Other ​ ​ 7,234 ​ ​ — ​ ​ (5,712) ​ ​ 1,522 ​ 7,234 ​ (4,766) ​ 2,468 Total definite-lived ​ ​ 133,529 ​ ​ — ​ ​ (33,159) ​ ​ 100,370 ​ ​ 133,898 ​ ​ (27,419) ​ ​ 106,479 Indefinite-lived ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water rights ​ ​ 7,031 ​ ​ — ​ ​ — ​ ​ 7,031 ​ ​ 7,031 ​ ​ — ​ ​ 7,031 Trademarks ​ ​ 23,442 ​ ​ (9,082) ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ — ​ ​ 23,442 Total indefinite-lived ​ ​ 30,473 ​ ​ (9,082) ​ ​ — ​ ​ 21,391 ​ ​ 30,473 ​ ​ — ​ ​ 30,473 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total other intangible assets, net ​ $ 164,002 ​ $ (9,082) ​ $ (33,159) ​ $ 121,761 ​ $ 164,371 ​ $ (27,419) ​ $ 136,952
Summary of future estimated amortization expense for other intangible assets	​ ​ ​ ​ ​ ​ Amount ​ ​ (in thousands) Remainder of 2020 ​ $ 5,681 Year ending December 31, 2021 ​ 10,466 Year ending December 31, 2022 ​ 10,252 Year ending December 31, 2023 ​ 10,180 Year ending December 31, 2024 ​ 10,111 Thereafter ​ ​ 53,680 Total ​ $ 100,370

DEBT (Tables)

DEBT (Tables)	6 Months Ended
	Jun. 30, 2020
DEBT
Summary of Company's leverage ratio	​ ​ ​ ​ ​ ​ ​ ​ Level ​ Average Excess Availability ​ Base Rate Margin ​ Eurocurrency Rate Margin ​ ​ ​ ​ ​ ​ ​ I ​ < 33% of the commitments ​ 1.00% ​ 2.00% II ​ < 66.67% of the commitments and ≥ 33.33% of the commitments ​ 0.75% ​ 1.75% III ​ ≥ 66.67% of the commitments ​ 0.50% ​ 1.50%
Schedule of fee Percentage on unused credit facility	​ ​ ​ ​ ​ ​ Level ​ Average Revolver Usage ​ Unused Line Fee Percentage ​ ​ ​ ​ ​ I ​ ≥ 50% of the commitments ​ 0.250% II ​ < 50% of the commitments ​ 0.375%

EQUITY-BASED COMPENSATION (Tabl

EQUITY-BASED COMPENSATION (Tables)	6 Months Ended
	Jun. 30, 2020
Schedule of equity option activity and related information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2020 ​ ​ ​ ​ ​ ​ ​ Weighted-average ​ ​ ​ ​ ​ ​ ​ Weighted-average ​ Grant Date Value ​ Aggregate Intrinsic ​ Stock Options Exercise Price Term (Years) Value (in thousands) (a) Beginning balance, outstanding 3,797,319 ​ $ 15.95 ​ 4.2 ​ $ 509 Forfeited (22,437) ​ ​ 18.28 ​ ​ ​ ​ ​ Expired ​ (231,943) ​ ​ 14.27 ​ ​ ​ ​ ​ Ending balance, outstanding 3,542,939 ​ $ 16.05 ​ 3.3 ​ $ — Ending balance, exercisable ​ 3,539,564 ​ $ 15.22 ​ 3.3 ​ $ — Nonvested at June 30, 2020 ​ 3,375 ​ $ 22.22 ​ ​ ​ ​ ​ ​ (a)
Schedule of percentage of stock settled incentives earned	​ ​ ​ ​ Stock Price at Vesting Date (1) ​ Percentage of Target Amount Earned Less than $20.00 ​ 0% At least $20.00, but less than $25.00 ​ 100% $25.00 or greater ​ 200% ​ (1) The stock price at vesting date equaled the greater of (i) the fair market value of a share of the Class A Common Stock on the vesting date, or (ii) the volume weighted average closing price of a share of the Class A Common Stock, as reported on the New York Stock Exchange, for the 30 trading days preceding the vesting date.
Schedule of stock-settled incentive awards outstanding	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Award Value ​ Value at Target Being Recognized Nonvested as of December 31, 2019 ​ $ 2,937 ​ $ 1,122 Forfeited during 2020 ​ ​ (410) ​ ​ (157) Awards earned and forfeited as market condition not satisfied as of vesting date ​ ​ (2,527) ​ ​ — Cumulative expense recognized ​ $ — ​ $ 965
summary of ESPP activity	The following table summarizes ESPP activity (in thousands, except shares): ​ ​ ​ ​ ​ ​ For the six months ended ​ June 30, 2020 Cash received for shares issued ​ $ 42 Shares issued ​ ​ 7,640
Restricted Stock
Schedule of restricted stock activity	​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2020 ​ ​ ​ ​ Weighted-average ​ Restricted Stock Awards Grant Date Fair Value Nonvested at December 31, 2019 ​ 1,518,193 ​ $ 10.08 Granted ​ 1,477,488 ​ ​ 5.80 Vested ​ (561,682) ​ ​ 11.92 Forfeited ​ (340,328) ​ ​ 7.55 Nonvested at June 30, 2020 ​ 2,093,671 ​ $ 6.98
Restricted Stock Units
Schedule of restricted stock activity	​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2020 ​ ​ ​ ​ Weighted-average ​ Restricted Stock Units Grant Date Fair Value Nonvested at December 31, 2019 1,250 ​ $ 19.00 Vested (625) ​ ​ 20.00 Forfeited (625) ​ ​ 18.00 Nonvested at June 30, 2020 — ​ $ —
Performance share units
Schedule of percentage of target PSUs earned	​ ​ ​ ​ Return on Assets at Performance Period End Date ​ Percentage of Target PSUs Earned Less than 9.6% ​ 0% 9.6% ​ 50% 12% ​ 100% 14.4% ​ 175% ​ ​ ​ ​ Ranking Among Peer Group ​ Percentage of Target Amount Earned Outside of Top 10 ​ 0% Top 10 ​ 50% Top 7 ​ 100% Top 3 ​ 175% ​ ​ ​ ​ Adjusted FCF Performance Percentage ​ Percentage of Target Amount Earned Less than 70% ​ 0% 70% ​ 50% 100% ​ 100% 130% ​ 175%
Summary of activity related to the units outstanding	​ ​ ​ ​ ​ Performance Share Units Nonvested as of December 31, 2019 ​ 1,014,990 Target shares granted ​ 753,378 Target shares outstanding as of June 30, 2020 ​ 1,768,368

FAIR VALUE MEASUREMENT (Tables)

FAIR VALUE MEASUREMENT (Tables)	6 Months Ended
	Jun. 30, 2020
FAIR VALUE MEASUREMENT
Summary of assets and liabilities measured at fair value on a non-recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measurements Using ​ Carrying ​ ​ ​ ​ ​ Measurement Date Level 1 Level 2 Level 3 Value (1) Impairment ​ ​ ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended June 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Goodwill ​ March 31 ​ $ — ​ $ — ​ $ — ​ $ 266,934 ​ $ 266,934 Trademark ​ March 31 ​ ​ — ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ 9,082 Property and equipment ​ March 31 ​ ​ — ​ ​ — ​ ​ 176 ​ ​ 3,360 ​ ​ 3,184 Property and equipment ​ June 30 ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,726 ​ ​ 4,726 (1) Amount represents carrying value at the date of assessment.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	6 Months Ended
	Jun. 30, 2020
INCOME TAXES
Summary of components of the federal and state income tax expense (benefit)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended June 30, ​ Six months ended June 30, ​ ​ 2020 ​ 2019 ​ 2020 ​ 2019 ​ ​ (in thousands) Current income tax (benefit) expense ​ $ (607) ​ $ 405 ​ $ (679) ​ $ 583 Deferred income tax expense ​ ​ 477 ​ ​ 166 ​ ​ 385 ​ ​ 166 Total income tax (benefit) expense ​ $ (130) ​ $ 571 ​ $ (294) ​ $ 749 Effective Tax Rate ​ ​ 0.2% ​ ​ 6.6% ​ ​ 0.1% ​ ​ 7.3%

NONCONTROLLING INTERESTS (Table

NONCONTROLLING INTERESTS (Tables)	6 Months Ended
	Jun. 30, 2020
NONCONTROLLING INTERESTS
Schedule of Non Controlling Interests Categories	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ ​ June 30, 2020 December 31, 2019 ​ ​ ​ (in thousands) Noncontrolling interests attributable to joint ventures formed for water-related services ​ ​ $ 1,960 $ 2,674 Noncontrolling interests attributable to holders of Class B Common Stock ​ ​ ​ 119,205 172,961 Total noncontrolling interests ​ ​ $ 121,165 $ 175,635
Summary of the effects of changes in noncontrolling interests	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, ​ ​ 2020 2019 ​ ​ ​ (in thousands) Net (loss) income attributable to Select Energy Services, Inc. ​ ​ $ (290,160) $ 7,335 Transfers (to) from noncontrolling interests: ​ ​ ​ ​ ​ Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures ​ ​ 1,911 3,540 Increase in additional paid-in capital as a result of issuance of common stock due to vesting of restricted stock units ​ ​ ​ 1 ​ ​ 4 Decrease in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units ​ ​ (1,405) (25) Increase in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued ​ ​ ​ 4 ​ ​ 2 Change to equity from net (loss) income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests ​ ​ $ (289,649) $ 10,856

(LOSS) EARNINGS PER SHARE (Tabl

(LOSS) EARNINGS PER SHARE (Tables)	6 Months Ended
	Jun. 30, 2020
(LOSS) EARNINGS PER SHARE
Summary of calculation of basic and diluted earnings per share	The following tables present the Company’s calculation of basic and diluted (loss) earnings per share for the Current and Prior Quarter and the Current and Prior Period (dollars in thousands, except share and per share amounts): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended June 30, 2020 ​ Three months ended June 30, 2019 ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Services, Inc. Class A Class B Services, Inc. Class A Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net (loss) income ​ $ (53,044) ​ ​ ​ ​ ​ ​ ​ $ 8,068 ​ ​ ​ ​ ​ ​ Net loss (income) attributable to noncontrolling interests ​ ​ 8,746 ​ ​ ​ ​ ​ ​ ​ ​ (1,868) ​ ​ ​ ​ ​ ​ Net (loss) income attributable to Select Energy Services, Inc. — basic ​ ​ (44,298) ​ $ (44,298) ​ $ — ​ ​ 6,200 ​ $ 6,200 ​ $ — Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of restricted stock ​ ​ — ​ ​ — ​ ​ — ​ ​ 9 ​ ​ 9 ​ ​ — Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of stock options ​ ​ — ​ ​ — ​ ​ — ​ ​ 3 ​ ​ 3 ​ ​ — Net (loss) income attributable to Select Energy Services, Inc. — diluted ​ $ (44,298) ​ $ (44,298) ​ $ — ​ $ 6,212 ​ $ 6,212 ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 84,937,043 ​ ​ 16,221,101 ​ ​ ​ ​ ​ 78,544,502 ​ ​ 26,026,843 Dilutive effect of restricted stock ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 471,542 ​ ​ — Dilutive effect of stock options ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 150,889 ​ ​ — Dilutive effect of ESPP ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 102 ​ ​ — Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 84,937,043 ​ ​ 16,221,101 ​ ​ ​ ​ ​ 79,167,035 ​ ​ 26,026,843 (Loss) earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ (0.52) ​ $ — ​ ​ ​ ​ $ 0.08 ​ $ — Diluted ​ ​ ​ ​ $ (0.52) ​ $ — ​ ​ ​ ​ $ 0.08 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six months ended June 30, 2020 ​ Six months ended June 30, 2019 ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Services, Inc. Class A Class B Services, Inc. Class A Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net (loss) income ​ $ (344,264) ​ ​ ​ ​ ​ ​ ​ $ 9,468 ​ ​ ​ ​ ​ ​ Net loss (income) attributable to noncontrolling interests ​ ​ 54,104 ​ ​ ​ ​ ​ ​ ​ ​ (2,133) ​ ​ ​ ​ ​ ​ Net (loss) income attributable to Select Energy Services, Inc. — basic ​ ​ (290,160) ​ $ (290,160) ​ $ — ​ ​ 7,335 ​ $ 7,335 ​ $ — Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of restricted stock ​ ​ — ​ ​ — ​ ​ — ​ ​ 8 ​ ​ 8 ​ ​ — Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of stock options ​ ​ — ​ ​ — ​ ​ — ​ ​ 2 ​ ​ 2 ​ ​ — Net (loss) income attributable to Select Energy Services, Inc. — diluted ​ $ (290,160) ​ $ (290,160) ​ $ — ​ $ 7,345 ​ $ 7,345 ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 85,520,935 ​ ​ 16,221,101 ​ ​ ​ ​ ​ 78,533,761 ​ ​ 26,026,843 Dilutive effect of restricted stock ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 351,780 ​ ​ — Dilutive effect of stock options ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 78,353 ​ ​ — Dilutive effect of ESPP ​ ​ ​ ​ ​ — ​ ​ — ​ ​ ​ ​ ​ 195 ​ ​ — Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 85,520,935 ​ ​ 16,221,101 ​ ​ ​ ​ ​ 78,964,089 ​ ​ 26,026,843 (Loss) earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ (3.39) ​ $ — ​ ​ ​ ​ $ 0.09 ​ $ — Diluted ​ ​ ​ ​ $ (3.39) ​ $ — ​ ​ ​ ​ $ 0.09 ​ $ —

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2020
SEGMENT INFORMATION
Summary of financial information by segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended June 30, 2020 ​ ​ ​ Loss Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 56,090 ​ $ (22,518) ​ $ 15,880 ​ $ (48) Water Infrastructure ​ ​ 15,439 ​ ​ (11,037) ​ ​ 7,024 ​ ​ (205) Oilfield Chemicals ​ ​ 21,174 ​ ​ (7,216) ​ ​ 2,604 ​ ​ 1,614 Other ​ ​ — ​ ​ (38) ​ ​ — ​ ​ — Eliminations ​ (464) ​ — ​ — ​ — Loss from operations ​ ​ ​ (40,809) ​ ​ ​ ​ Corporate ​ — ​ (6,996) ​ 834 ​ — Interest expense, net ​ — ​ (513) ​ — ​ — Other expense, net ​ — ​ (4,856) ​ — ​ — ​ ​ $ 92,239 ​ $ (53,174) ​ $ 26,342 ​ $ 1,361 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended June 30, 2019 ​ ​ ​ Income (loss) Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 202,997 ​ $ 16,234 ​ $ 21,024 ​ $ 9,489 Water Infrastructure ​ ​ 51,719 ​ ​ 3,202 ​ ​ 6,072 ​ ​ 11,542 Oilfield Chemicals ​ ​ 62,997 ​ ​ 4,424 ​ ​ 1,747 ​ ​ 2,132 Other ​ ​ 9,403 ​ ​ 673 ​ ​ — ​ ​ 3 Eliminations ​ (3,229) ​ — ​ — ​ — Income from operations ​ ​ ​ 24,533 ​ ​ ​ ​ Corporate ​ — ​ (13,354) ​ 906 ​ — Interest expense, net ​ — ​ (839) ​ — ​ — Other expense, net ​ — ​ (1,701) ​ — ​ — ​ ​ $ 323,887 ​ $ 8,639 ​ $ 29,749 ​ $ 23,166 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2020 ​ ​ ​ Loss Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 206,242 ​ $ (218,418) ​ $ 33,036 ​ $ 1,219 Water Infrastructure ​ ​ 73,323 ​ ​ (93,114) ​ ​ 14,052 ​ ​ 2,363 Oilfield Chemicals ​ ​ 92,202 ​ ​ (10,112) ​ ​ 4,602 ​ ​ 4,504 Other ​ ​ — ​ ​ (13) ​ ​ — ​ ​ 325 Eliminations ​ (1,243) ​ — ​ — ​ — Loss from operations ​ ​ ​ (321,657) ​ ​ ​ ​ Corporate ​ — ​ (16,979) ​ 1,519 ​ — Interest expense, net ​ — ​ (844) ​ — ​ — Other expense, net ​ — ​ (5,078) ​ — ​ — ​ ​ $ 370,524 ​ $ (344,558) ​ $ 53,209 ​ $ 8,411 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the six months ended June 30, 2019 ​ ​ ​ Income (loss) Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 423,877 ​ $ 39,894 ​ $ 42,286 ​ $ 22,615 Water Infrastructure ​ ​ 105,335 ​ ​ 7,003 ​ ​ 12,161 ​ ​ 28,780 Oilfield Chemicals ​ ​ 130,116 ​ ​ 6,437 ​ ​ 4,200 ​ ​ 3,352 Other ​ ​ 33,073 ​ ​ (5,850) ​ ​ 1,714 ​ ​ 64 Eliminations ​ (5,868) ​ — ​ — ​ — Income from operations ​ ​ ​ 47,484 ​ ​ ​ ​ Corporate ​ — ​ (29,672) ​ 1,906 ​ — Interest expense, net ​ — ​ (1,932) ​ — ​ — Other expense, net ​ — ​ (5,663) ​ — ​ — ​ ​ $ 686,533 ​ $ 10,217 ​ $ 62,267 ​ $ 54,811 ​ Total assets by segment as of June 30, 2020 and December 31, 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ June 30, 2020 December 31, 2019 ​ ​ (in thousands) Water Services ​ $ 559,889 ​ $ 831,123 Water Infrastructure ​ 194,622 ​ 314,026 Oilfield Chemicals ​ 149,727 ​ 192,224 Other ​ ​ 7,076 ​ ​ 10,247 ​ ​ $ 911,314 ​ $ 1,347,620

BUSINESS AND BASIS OF PRESENT_2

BUSINESS AND BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Millions	Apr. 26, 2017shares	Dec. 20, 2016$ / sharesshares	Jun. 30, 2020segmentitem$ / sharesshares	Dec. 31, 2019$ / sharesshares	Nov. 01, 2017USD ($)	Dec. 31, 2016shares
Common units issued		16,100,000
Number of tax receivable agreements			2
Common shares exchanged			0
Number of cost-method investee | item			1
Number of operating segments | segment			3
Number of reportable segments | segment			3
Revolving line of credit
Maximum borrowing capacity | $					$ 300
Class A-1 Common Stock
Par value | $ / shares		$ 0.01
Class A-1 Common Stock | Private Placement
Shares issued		16,100,000
Conversion rate per share						1
Class A Common Stock
Par value | $ / shares		$ 0.01	$ 0.01	$ 0.01
Common stock issued			86,883,049	87,893,525
Common units exchanged				9,805,742
Common shares exchanged				9,805,742
Class A Common Stock | IPO
Shares issued	8,700,000
Class B Common Stock
Par value | $ / shares		$ 0.01	$ 0.01	$ 0.01
Common stock issued		38,462,541	16,221,101	16,221,101
Common Stock, Shares, Outstanding			16,221,101	16,221,101
Shares cancelled				9,805,742
Class A-2 Common Stock
Par value | $ / shares			$ 0.01	$ 0.01
Common stock issued			0	0
Common Stock, Shares, Outstanding			0	0

SIGNIFICANT ACCOUNTING POLICI_4

SIGNIFICANT ACCOUNTING POLICIES - (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)lease	Jun. 30, 2019USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period			$ 5,773
Increase to allowance based on a percent of Current Quarter revenue			741
Adjustment based on aged receivable analysis			4,069
Charge-offs			(1,109)
Balance at end of period	$ 9,474		9,474
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of Current Period			1,527
Accretion expense, included in depreciation and amortization expense			62
Disposals			(219)
Payments			(101)
Balance at end of Current Period	1,269		$ 1,269
Lessor Income
Number of owned operating leases | lease			3
Number of subleases | lease			12
Lessor income	96	$ 69	$ 212	$ 180
Sublease income	335	390	736	762
Operating leases
Gross down, Right of use assets	5,700
Gross down, Lease liabilities	5,700
Defined Contribution Plan
401(k) match expense	0	$ 1,200	0	$ 2,500
Payroll Tax Deferral	$ 2,200		$ 2,200

IMPAIRMENTS AND OTHER COSTS (De

IMPAIRMENTS AND OTHER COSTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name			$ 276,016	$ 4,396
Impairment and abandonment of property and equipment	$ 4,726	$ 374	7,910	893
Severance Costs	3,666		7,168	1,680
Yard closure costs	1,011		2,961
Lease Abandonment Costs	868	183	1,821	1,256
Accrued severance	1,800		1,800
Water Services
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name			186,468
Impairment and abandonment of property and equipment	1,396		3,894
Severance Costs	2,746		4,569
Yard closure costs	695		2,645
Lease Abandonment Costs	848	218	1,783	447
Water Infrastructure
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name			80,466
Impairment and abandonment of property and equipment	3,330		4,016
Severance Costs	212		500
Lease Abandonment Costs			51
Oilfield Chemicals
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name			9,082
Severance Costs	693		813
Yard closure costs	316		316
Lease Abandonment Costs	42	7	42	7
Other
Restructuring Cost and Reserve [Line Items]
Impairment of goodwill and trade name				4,396
Impairment and abandonment of property and equipment		374		893
Severance Costs	15		1,286	1,680
Lease Abandonment Costs	(22)	$ (42)	(55)	802
Costs of revenue
Restructuring Cost and Reserve [Line Items]
Severance Costs	2,200		4,000
Yard closure costs	1,000		3,000
Lease Abandonment Costs			1,800
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 1,500		$ 3,200	$ 1,700

ACQUISITIONS (Details)

ACQUISITIONS (Details) - Well Chemical Services Acquisition $ in Thousands	Sep. 30, 2019USD ($)
Consideration transferred
Cash paid	$ 10,000
Total consideration transferred	10,000
Less: identified assets acquired and liabilities assumed
Inventory	5,221
Property and equipment	4,473
Intangible assets	476
Current liabilities	(170)
Total identifiable net assets acquired	10,000
Fair value allocated to net assets acquired	$ 10,000

REVENUE (Details)

REVENUE (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)region	Jun. 30, 2019USD ($)region	Jun. 30, 2020USD ($)segmentregion	Jun. 30, 2019USD ($)region
REVENUE
Number of Reportable Segments | segment			3
Revenue	$ 92,239	$ 323,887	$ 370,524	$ 686,533
Permian Basin
REVENUE
Revenue	36,638	148,118	174,636	310,783
Eagle Ford
REVENUE
Revenue	10,672	41,033	46,336	79,759
Haynesville/E. Texas
REVENUE
Revenue	14,708	18,314	33,723	35,596
Marcellus/Utica
REVENUE
Revenue	13,251	28,292	33,090	58,451
MidCon
REVENUE
Revenue	7,825	48,515	32,698	106,978
Rockies
REVENUE
Revenue	6,927	21,494	25,796	43,936
Bakken
REVENUE
Revenue	2,542	20,361	25,102	46,143
All other
REVENUE
Revenue	$ (324)	$ (2,240)	$ (857)	$ 4,887
Permian Basin, Eagle Ford and Marcellus/Utica | Water Services
REVENUE
Number of revenue producing regions | region	3	3	3	3
Percentage of revenue	69.00%	72.00%	73.00%	72.00%
Permian Basin and Bakken | Water Infrastructure
REVENUE
Number of revenue producing regions | region	2	2	2	2
Percentage of revenue	82.00%	81.00%	86.00%	82.00%
Permian Basin, Haynesville/E. Texas and MidCon | Oilfield Chemicals
REVENUE
Number of revenue producing regions | region	3	3	3	3
Percentage of revenue	89.00%	87.00%	83.00%	87.00%

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Significant components of inventory
Raw materials	$ 17,963		$ 17,963		$ 12,365
Finished goods	20,223		20,223		24,724
Materials and supplies					453
Inventory net	38,186		38,186		37,542
Inventory write-downs	500	$ 100	566	$ 209
Inventory Valuation Reserves	$ 4,400		$ 4,400		$ 4,100

PROPERTY AND EQUIPMENT (Details

PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property and equipment
Property and equipment	$ 930,308		$ 930,308		$ 1,015,379
Accumulated depreciation	(537,323)		(537,323)		(562,986)
Property and equipment held-for-sale, net					885
Total property and equipment, net	392,985		392,985		453,278
Accumulated depreciation related to finance leases	1,500		1,500		1,600
depreciation and amortization expense
Depreciation expense from property and equipment	23,286	$ 26,228	47,271	$ 55,535
Amortization expense from finance lease	39	523	116	737
Amortization expense from intangible assets	2,986	2,969	5,979	5,938
Accretion expense from asset retirement obligation	31	29	(157)	57
Total depreciation and amortization	26,342	$ 29,749	53,209	62,267
Property and Equipment Held-for-Sale and Impairments
Net loss on divestitures and sales of property and equipment held-for-sale			2,207	$ 2,794
Canadian Assets
Property and Equipment Held-for-Sale and Impairments
Net loss on divestitures and sales of property and equipment held-for-sale			100
Land
Property and equipment
Property and equipment	14,213		14,213		16,030
Buildings and leasehold improvements
Property and equipment
Property and equipment	91,950		91,950		97,426
Vehicles and equipment
Property and equipment
Property and equipment	38,390		38,390		53,819
Vehicles and equipment - finance lease
Property and equipment
Property and equipment	1,031		1,031		1,291
Machinery and equipment
Property and equipment
Property and equipment	631,501		631,501		659,835
Machinery and equipment - finance lease
Property and equipment
Property and equipment	612		612		162
Computer equipment and software
Property and equipment
Property and equipment	6,753		6,753		8,051
Computer equipment and software - finance lease
Property and equipment
Property and equipment	356		356		356
Pipelines
Property and equipment
Property and equipment	72,111		72,111		69,327
Office furniture and equipment
Property and equipment
Property and equipment	1,027		1,027		1,157
Disposal wells
Property and equipment
Property and equipment	51,162		51,162		64,149
Other
Property and equipment
Property and equipment					497
Construction in progress
Property and equipment
Property and equipment	$ 21,202		$ 21,202		$ 43,279

PROPERTY AND EQUIPMENT- Sold An

PROPERTY AND EQUIPMENT- Sold And Divested (Details) $ in Thousands	Dec. 31, 2019USD ($)
PROPERTY AND EQUIPMENT
Property and equipment held-for-sale	$ 885

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Goodwill
Balance at the beginning of the period	$ 266,934
Impairment	(266,934)
Water Services
Goodwill
Balance at the beginning of the period	186,468
Impairment	(186,468)
Water Infrastructure
Goodwill
Balance at the beginning of the period	80,466
Impairment	$ (80,466)

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Other intangible assets
Gross Value, Definite-lived	$ 133,529		$ 133,529		$ 133,898
Accumulated Amortization, Definite-lived	(33,159)	$ (33,159)	(33,159)	$ (33,159)	(27,419)
Total	100,370		100,370		106,479
Gross Value, Indefinite-lived	30,473		30,473		30,473
Impairment, Indefinite-lived			(9,082)
Net Value, Indefinite-lived			21,391		30,473
Intangible Assets, Gross (Excluding Goodwill)	164,002		164,002		164,371
Intangible Assets, Net (Excluding Goodwill)	121,761		121,761		136,952
Amortization of Intangible Assets	2,986	$ 2,969	5,979	$ 5,938
Water rights
Other intangible assets
Gross Value, Indefinite-lived	7,031		7,031		7,031
Net Value, Indefinite-lived					7,031
Intangible Assets, Net (Excluding Goodwill)	7,031		$ 7,031
Renewal term			5 years
Trademarks
Other intangible assets
Gross Value, Indefinite-lived	23,442		$ 23,442		23,442
Impairment, Indefinite-lived			(9,082)
Net Value, Indefinite-lived					23,442
Intangible Assets, Net (Excluding Goodwill)	14,360		$ 14,360
Renewal term			10 years
Customer relationships
Other intangible assets
Gross Value, Definite-lived	116,554		$ 116,554		116,554
Accumulated Amortization, Definite-lived	(24,768)		(24,768)		(20,233)
Total	91,786		$ 91,786		96,321
Weighted average amortization period			10 years 2 months 12 days
Patents
Other intangible assets
Gross Value, Definite-lived	9,741		$ 9,741		10,110
Accumulated Amortization, Definite-lived	(2,679)		(2,679)		(2,420)
Total	7,062		$ 7,062		7,690
Weighted average amortization period			7 years 3 months 18 days
Other intangibles
Other intangible assets
Gross Value, Definite-lived	7,234		$ 7,234		7,234
Accumulated Amortization, Definite-lived	(5,712)		(5,712)		(4,766)
Total	$ 1,522		$ 1,522		$ 2,468
Weighted average amortization period			2 years 3 months 18 days

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS - Annual Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Annual amortization of intangible assets
Remainder of 2020	$ 5,681
Year ending December 31, 2021	10,466
Year ending December 31, 2022	10,252
Year ending December 31, 2023	10,180
Year ending December 31, 2024	10,111
Thereafter	53,680
Total	$ 100,370	$ 106,479

DEBT (Details)

DEBT (Details) - USD ($) $ in Thousands	Nov. 01, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
DEBT
Amortization of debt issuance costs		$ 200	$ 200	$ 344	$ 344
Average excess availability, less than 33% of the commitments | Base Rate Advances
DEBT
Variable interest rate (as a percent)		1.00%		1.00%
Average excess availability, less than 33% of the commitments | LIBOR
DEBT
Variable interest rate (as a percent)		2.00%		2.00%
Average excess availability, less than 66.67% of the commitments and more than or equal to 33.33% of the commitments | Base Rate Advances
DEBT
Variable interest rate (as a percent)		0.75%		0.75%
Average excess availability, less than 66.67% of the commitments and more than or equal to 33.33% of the commitments | LIBOR
DEBT
Variable interest rate (as a percent)		1.75%		1.75%
Average excess availability, more than or equal to 66.67% of the commitments | Base Rate Advances
DEBT
Variable interest rate (as a percent)		0.50%		0.50%
Average excess availability, more than or equal to 66.67% of the commitments | LIBOR
DEBT
Variable interest rate (as a percent)		1.50%		1.50%
Average excess availability more than or equal to fifty percent
DEBT
Unused line fee (as a percent)				0.25%
Average excess availability less than fifty percent
DEBT
Unused line fee (as a percent)				0.375%
Eligible unbilled receivables
DEBT
Borrowing base (as a percent)	75.00%
Letter of credit
DEBT
Amount outstanding		$ 0		$ 0
Revolving line of credit
DEBT
Maximum borrowing capacity	$ 300,000
Revolving line of credit | Letter of credit
DEBT
Maximum borrowing capacity		111,100		$ 111,100		$ 214,600
Senior secured credit facility
DEBT
Additional borrowing capacity	$ 150,000
Time frame for increasing borrowing capacity				3 years
Percentage of borrowing base allowed	35.00%
Margin (as a percent)	2.00%
Reduction in borrowing capacity		15,600		$ 15,600		19,900
Unused portion of available borrowing		95,500		95,500
Debt issuance costs		$ 1,600		$ 1,600		$ 2,000
Senior secured credit facility | Minimum
DEBT
Percentage of borrowing base allowed	30.00%
Variable interest rate (as a percent)		1.50%		1.50%
Senior secured credit facility | Maximum
DEBT
Variable interest rate (as a percent)		2.00%		2.00%
Senior secured credit facility | Base Rate Advances | Minimum
DEBT
Margin (as a percent)	0.50%
Senior secured credit facility | Base Rate Advances | Maximum
DEBT
Margin (as a percent)	1.00%
Senior secured credit facility | LIBOR
DEBT
Margin (as a percent)	1.00%
Senior secured credit facility | LIBOR | Minimum
DEBT
Margin (as a percent)	1.50%
Senior secured credit facility | LIBOR | Maximum
DEBT
Margin (as a percent)	2.00%
Senior secured credit facility | Federal Funds Rate
DEBT
Margin (as a percent)	0.50%
Senior secured credit facility | Eligible billed receivables
DEBT
Borrowing base (as a percent)	85.00%
Senior secured credit facility | Eligible inventory
DEBT
Borrowing base (as a percent)	70.00%
Senior secured credit facility | Net recovery percentage
DEBT
Borrowing base (as a percent)	85.00%
Senior secured credit facility | Criteria for distributions, scenario one
DEBT
Lookback period	30 days
Percentage outstanding	25.00%
Base amount	$ 37,500
Senior secured credit facility | Criteria for distributions, scenario two
DEBT
Lookback period	30 days
Percentage outstanding	20.00%
Base amount	$ 30,000
Fixed charge coverage ratio	1.00%
Senior secured credit facility | Coverage Ratio Criteria
DEBT
Lookback period	60 days
Percentage outstanding	10.00%
Base amount	$ 15,000
Fixed charge coverage ratio	1.00%
Senior secured credit facility | Letter of credit
DEBT
Maximum borrowing capacity	$ 40,000
Senior secured credit facility | Swingline loan
DEBT
Maximum borrowing capacity	$ 30,000

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
COMMITMENTS AND CONTINGENCIES
Percentage of vehicles in which certain employees at some of the facilities altered emissions controls systems	5.00%
Litigation Settlement Accrual	$ 4.3

EQUITY-BASED COMPENSATION (Deta

EQUITY-BASED COMPENSATION (Details) - shares	Nov. 01, 2017	Jun. 30, 2020	Feb. 28, 2020
2016 plan | Maximum
EQUITY-BASED COMPENSATION
Equity options term	10 years
Rockwater Equity Plan
EQUITY-BASED COMPENSATION
Maximum number of shares		13,300,000
Second Amendment to the 2016 Plan [Member] | Class A Common Stock
EQUITY-BASED COMPENSATION
Maximum number of shares			4,000,000

EQUITY-BASED COMPENSATION - Equ

EQUITY-BASED COMPENSATION - Equity Options Changed During Period (Details) - Equity options - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Equity Options
Beginning balance (in shares)	3,797,319
Granted (in shares)	0	0
Forfeited (in shares)	(22,437)
Expired (in shares)	(231,943)
Ending balance (in shares)	3,542,939	3,797,319
Ending balance, exercisable (in shares)	3,539,564
Nonvested at end of period (in shares)	3,375
Weighted-average Exercise Price
Beginning balance (in dollars per share)	$ 15.95
Forfeited (in dollars per share)	18.28
Expired (in dollars per share)	14.27
Ending balance (in dollars per share)	16.05	$ 15.95
Ending balance, exercisable	15.22
Nonvested at end of period (in dollar per share)	$ 22.22
Weighted-average Remaining Contractual Term (Years)
Outstanding	3 years 3 months 18 days	4 years 2 months 12 days
Ending balance, exercisable	3 years 3 months 18 days
Aggregate Intrinsic Value
Beginning balance, outstanding	$ 509
Ending balance, outstanding		$ 509

EQUITY BASED COMPENSATION - Roc

EQUITY BASED COMPENSATION - Rockwater awards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restricted Stock
Assumptions for equity options granted:
Equity-based compensation expense	$ 1.9	$ 2.2	$ 3.8	$ 4
Equity options
Assumptions for equity options granted:
Equity-based compensation expense	$ 0	$ 1	$ 0.2	$ 2.3
Equity options | Class A Common Stock
Assumptions for equity options granted:
Underlying Equity	$ 4.90		$ 4.90		$ 9.28

EQUITY-BASED COMPENSATION - Res

EQUITY-BASED COMPENSATION - Restricted stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restricted Stock
EQUITY-BASED COMPENSATION
Compensation expense	$ 1.9	$ 2.2	$ 3.8	$ 4
Restricted Stock | Minimum
EQUITY-BASED COMPENSATION
offering period			1 year
Restricted Stock | Maximum
EQUITY-BASED COMPENSATION
offering period			3 years
Restricted Stock Awards
EQUITY-BASED COMPENSATION
Unrecognized compensation expense	$ 11.4		$ 11.4
Weighted-average remaining life			1 year 7 months 6 days
Restricted stock
Beginning balance (in shares)			1,518,193
Granted (in shares)			1,477,488
Vested (in shares)			(561,682)
Forfeited (in shares)			(340,328)
Ending balance (in shares)	2,093,671		2,093,671
Grant Date Fair Value
Beginning balance (in dollars per share)			$ 10.08
Granted (in dollars per share)			5.80
Vested (in dollars per share)			11.92
Forfeited			7.55
Ending balance (in dollars per share)	$ 6.98		$ 6.98
Restricted Stock Units
Restricted stock
Beginning balance (in shares)			1,250
Vested (in shares)			(625)
Forfeited (in shares)			(625)
Grant Date Fair Value
Beginning balance (in dollars per share)			$ 19
Vested (in dollars per share)			20
Forfeited			$ 18

EQUITY-BASED COMPENSATION - Per

EQUITY-BASED COMPENSATION - Performance share units (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)item	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)item
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of times shares issued for each performance share settlement | item					1	1
Grant date fair value of PSUs | $			$ 4.4		$ 7	$ 5.9
Compensation expense | $	$ (0.7)	$ 0.8	(2.2)	$ 1.7
Fair value of outstanding shares | $			$ 3.3
Weighted-average remaining life			1 year 9 months 18 days
Performance share units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of times shares issued for each performance share settlement | item			0
Percentage of Target PSUs Earned	0.00%		0.00%
Performance share units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of times shares issued for each performance share settlement | item			1.75
Percentage of Target PSUs Earned			175.00%
Return on assets Less than 9.6% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs Earned			0.00%
Return on assets 9.6% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs Earned			50.00%
Return on assets 12% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs Earned			100.00%
Return on assets 14.4% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs Earned			175.00%
Peer Group Outside of Top 10 | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			0.00%
Peer Group Top 10 | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			50.00%
Peer Group Top 7 | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			100.00%
Peer Group Top 3 | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			175.00%
Adjusted FCF Performance Percentage Less than 70% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			0.00%
Adjusted FCF Performance Percentage 70% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			50.00%
Adjusted FCF Performance Percentage 100% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			100.00%
Adjusted FCF Performance Percentage 130% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			175.00%
Return On Assets Five Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount Earned			5.00%

EQUITY-BASED COMPENSATION - P_2

EQUITY-BASED COMPENSATION - Performance share units outstanding (Details) - Performance share units	6 Months Ended
	Jun. 30, 2020shares
Performance share units
Beginning balance (in shares)	1,014,990
Target shares granted	753,378
Ending balance (in shares)	1,768,368

EQUITY-BASED COMPENSATION - Sto

EQUITY-BASED COMPENSATION - Stock-Settled Incentive Awards (Details) - Stock-Settled Incentive Awards - USD ($) $ in Millions	May 17, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020
EQUITY-BASED COMPENSATION
offering period	2 years
Percentage of Target Amount Earned						0.00%
Vesting date						30 days
Target amount of stock settled incentive awards granted						$ 3.9
Number of shares issued						0
Compensation expense		$ 0.1	$ 0.1	$ 0.1	$ 0.3
Minimum
EQUITY-BASED COMPENSATION
Pay out percentage	0.00%
Maximum
EQUITY-BASED COMPENSATION
Pay out percentage	200.00%
Less than $20.00
EQUITY-BASED COMPENSATION
Percentage of Target Amount Earned						0.00%
At least $20.00, but less than $25.00
EQUITY-BASED COMPENSATION
Percentage of Target Amount Earned						100.00%
$25.00 or greater
EQUITY-BASED COMPENSATION
Percentage of Target Amount Earned						200.00%

EQUITY-BASED COMPENSATION - S_2

EQUITY-BASED COMPENSATION - Stock-settled incentive awards outstanding (Details) - Stock-Settled Incentive Awards shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)shares
Value at Target
Non-vested at beginning of period	$ 2,937
Forfeited during 2020	$ (410)
Awards earned and forfeited as market condition not satisfied as of vesting date | shares	(2,527)
Award Value Being Recognized
Non-vested at beginning of period	$ 1,122
Forfeited during 2020	(157)
Non-vested at end of period	$ 965

EQUITY-BASED COMPENSATION - Emp

EQUITY-BASED COMPENSATION - Employee Stock Purchase Plan (ESPP) (Details) - ESPP	6 Months Ended
	Jun. 30, 2020USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
offering period	4 years
Issue price (percentage)	95.00%
Maximum annual employees contribution	$ 15,000
Cash received for shares issued	$ 42,000
Shares issued | shares	7,640
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service period	1 year

EQUITY-BASED COMPENSATION - Sha

EQUITY-BASED COMPENSATION - Share-repurchases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
2016 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased in open market	1,139,729	0	1,989,440	82,092
Number of shares repurchased with employee minimum tax withholding requirements	36,781	26,716	166,461	70,410
Decrease in paid in-capital	$ 4		$ 10.6
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in Class A common stock	12,000		22,000

FAIR VALUE MEASUREMENT (Details

FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers into or out of all levels of the fair value hierarchy	$ 0		$ 0
Impairment of Goodwill	266,934
Impairment of property and equipment	7,910	$ 893
Nonrecurring | March 31
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Goodwill	266,934
Impairment of Trademark	9,082
Impairment of property and equipment	3,184
Nonrecurring | March 31 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	266,934
Trademark	23,442
Property and equipment	3,360
Nonrecurring | June 30
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property and equipment	4,726
Nonrecurring | June 30 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment	4,726
Level 3 | Nonrecurring | March 31 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trademark	14,360
Property and equipment	$ 176

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
RELATED PARTY TRANSACTIONS
Sales to related parties	$ 0.2	$ 3.6	$ 2.6	$ 9.9
Purchases from related party vendors	$ 1.5	6.4	$ 5.7	12.4
Minimum
RELATED PARTY TRANSACTIONS
Beneficial ownership (as a percent)	5.00%		5.00%
Tax Receivable Agreement | Legacy Owner Holdco and Crestview GP
RELATED PARTY TRANSACTIONS
Percentage of net tax savings for payment to TRA Holders			85.00%
Tax Receivable Agreement | Contributing Legacy Owners
RELATED PARTY TRANSACTIONS
Percentage of net tax savings for payment to TRA Holders			85.00%
Property and equipment
RELATED PARTY TRANSACTIONS
Purchases from related party vendors	$ 0.1	0.4	$ 0.3	1.9
Inventory and consumables
RELATED PARTY TRANSACTIONS
Purchases from related party vendors			0.1
Rent of certain equipment or other services
RELATED PARTY TRANSACTIONS
Purchases from related party vendors	$ 1.4	5.6	5.1	9.5
Management, consulting and other services
RELATED PARTY TRANSACTIONS
Purchases from related party vendors		$ 0.4	$ 0.2	$ 1

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INCOME TAXES
Current income tax (benefit) expense	$ (607)	$ 405	$ (679)	$ 583
Deferred income tax expense	477	166	385	166
Total income tax (benefit) expense	$ (130)	$ 571	$ (294)	$ 749
Effective Income tax (as percent)	0.20%	6.60%	0.10%	7.30%
Statutory tax rate (as a percent)			21.00%
Income tax benefit			$ 500

NONCONTROLLING INTERESTS (Detai

NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
NONCONTROLLING INTERESTS
Noncontrolling interests attributable to joint ventures formed for water-related services	$ 1,960	$ 2,674
Noncontrolling interests attributable to holders of Class B Common Stock	119,205	172,961
Total noncontrolling interests	$ 121,165	$ 175,635

NONCONTROLLING INTERESTS - Effe

NONCONTROLLING INTERESTS - Effect of Changes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Effects of changes in noncontrolling interests on equity
Net income (loss) attributable to Select Energy Services, Inc.	$ (44,298)	$ 6,200	$ (290,160)	$ 7,335
Transfers (to) from noncontrolling interests:
Noncontrolling interest in subsidiary	$ 133		133
Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures			1,911	3,540
Increase in additional paid-in capital as a result of issuance of common stock due to vesting of restricted stock units			1	4
(Decrease) increase in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units			(1,405)	(25)
Increase in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued			4	2
Change to equity from net income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests			$ (289,649)	$ 10,856
SES Holdings LLC [Member]
Transfers (to) from noncontrolling interests:
Noncontrolling Interest	50.00%		50.00%

(LOSS) EARNINGS PER SHARE (Deta

(LOSS) EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Calculation of basic and diluted earnings per share:
Antidilutive shares	3,542,939	2,972,967	3,542,939	2,976,537
Net (loss) income	$ (53,044)	$ 8,068	$ (344,264)	$ 9,468
Net (loss) income attributable to noncontrolling interests	8,746	(1,868)	54,104	(2,133)
Net (loss) income attributable to Select Energy Services, Inc.	(44,298)	6,200	(290,160)	7,335
Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of restricted stock		9		8
Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of stock options		3		2
Net income attributable to Select Energy Services, Inc. - diluted	(44,298)	6,212	(290,160)	7,345
Class A Common Stock
Calculation of basic and diluted earnings per share:
Net (loss) income attributable to Select Energy Services, Inc.	(44,298)	6,200	(290,160)	7,335
Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of restricted stock		9		8
Add: Reallocation of net loss (income) attributable to noncontrolling interests for the dilutive effect of stock options		3		2
Net income attributable to Select Energy Services, Inc. - diluted	$ (44,298)	$ 6,212	$ (290,160)	$ 7,345
Weighted-average shares of common stock outstanding - basic	84,937,043	78,544,502	85,520,935	78,533,761
Dilutive effect of restricted stock		471,542		351,780
Dilutive effect of stock options		150,889		78,353
Dilutive effect of ESPP		102		195
Weighted-average shares of common stock outstanding - diluted	84,937,043	79,167,035	85,520,935	78,964,089
Earnings (loss) per share, Basic (in dollars per share)	$ (0.52)	$ 0.08	$ (3.39)	$ 0.09
Earnings (loss) per share, Diluted (in dollars per share)	$ (0.52)	$ 0.08	$ (3.39)	$ 0.09
Class B Common Stock
Calculation of basic and diluted earnings per share:
Weighted-average shares of common stock outstanding - basic	16,221,101	26,026,843	16,221,101	26,026,843
Weighted-average shares of common stock outstanding - diluted	16,221,101	26,026,843	16,221,101	26,026,843

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)segment	Jun. 30, 2019USD ($)
SEGMENT INFORMATION
Number of operating segments | segment			3
Number of reportable segments | segment			3
Segment information
Revenue	$ 92,239	$ 323,887	$ 370,524	$ 686,533
Income (loss) before taxes	(53,174)	8,639	(344,558)	10,217
Depreciation and Amortization	26,342	29,749	53,209	62,267
Capital Expenditures	1,361	23,166	8,411	54,811
(Loss) income from operations	(47,805)	11,179	(338,636)	17,812
Other expense, net	(2,700)	(59)	(2,441)	210
Operating segment | Water Services
Segment information
Revenue	56,090	202,997	206,242	423,877
Income (loss) before taxes	(22,518)	16,234	(218,418)	39,894
Depreciation and Amortization	15,880	21,024	33,036	42,286
Capital Expenditures	(48)	9,489	1,219	22,615
Operating segment | Water Infrastructure
Segment information
Revenue	15,439	51,719	73,323	105,335
Income (loss) before taxes	(11,037)	3,202	(93,114)	7,003
Depreciation and Amortization	7,024	6,072	14,052	12,161
Capital Expenditures	(205)	11,542	2,363	28,780
Operating segment | Oilfield Chemicals
Segment information
Revenue	21,174	62,997	92,202	130,116
Income (loss) before taxes	(7,216)	4,424	(10,112)	6,437
Depreciation and Amortization	2,604	1,747	4,602	4,200
Capital Expenditures	1,614	2,132	4,504	3,352
Operating segment | Other
Segment information
Revenue		9,403		33,073
Income (loss) before taxes	(38)	673	(13)	(5,850)
Depreciation and Amortization				1,714
Capital Expenditures		3	325	64
Elimination
Segment information
Revenue	(464)	(3,229)	(1,243)	(5,868)
Corporate
Segment information
Income (loss) before taxes	(6,996)	(13,354)	(16,979)	(29,672)
Depreciation and Amortization	834	906	1,519	1,906
Material reconciling items
Segment information
(Loss) income from operations	(40,809)	24,533	(321,657)	47,484
Interest expense, net	(513)	(839)	(844)	(1,932)
Other expense, net	$ (4,856)	$ (1,701)	$ (5,078)	$ (5,663)

SEGMENT INFORMATION - Total Ass

SEGMENT INFORMATION - Total Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 911,314	$ 1,347,620
Operating segment | Water Services
Segment Reporting Information [Line Items]
Assets	559,889	831,123
Operating segment | Water Infrastructure
Segment Reporting Information [Line Items]
Assets	194,622	314,026
Operating segment | Oilfield Chemicals
Segment Reporting Information [Line Items]
Assets	149,727	192,224
Operating segment | Other
Segment Reporting Information [Line Items]
Assets	$ 7,076	$ 10,247