Select Energy Services (WTTR) 10-K 23 Feb 22 2021 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Feb. 21, 2022	Jun. 30, 2021
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 376.8
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001693256
Amendment Flag	false
Auditor Name	GRANT THORNTON LLP
Auditor Firm ID	248
Auditor Location	Dallas, Texas
Class A Common Stock
Document and Entity Information
Entity Common Stock, Shares Outstanding		91,900,518
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	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 85,801	$ 169,039
Accounts receivable trade, net of allowance for credit losses of $4,401 and $9,157, respectively	232,824	129,392
Accounts receivable, related parties	219	69
Inventories	44,456	33,384
Prepaid expenses and other current assets	31,486	19,621
Total current assets	394,786	351,505
Property and equipment	943,515	878,902
Accumulated depreciation	(551,727)	(528,537)
Total property and equipment, net	391,788	350,365
Right-of-use assets, net	47,732	52,331
Other intangible assets, net	108,472	116,079
Other long-term assets, net	7,414	5,079
Total assets	950,192	875,359
Current liabilities
Accounts payable	36,049	12,995
Accrued accounts payable	52,051	21,359
Accounts payable and accrued expenses, related parties	1,939	519
Accrued salaries and benefits	22,233	16,279
Accrued insurance	13,408	9,788
Sales tax payable	2,706	1,415
Accrued expenses and other current liabilities	19,544	12,077
Current operating lease liabilities	13,997	14,019
Current portion of finance lease obligations	113	307
Total current liabilities	162,040	88,758
Long-term operating lease liabilities	53,198	60,984
Other long-term liabilities	39,780	19,735
Total liabilities	255,018	169,477
Commitments and contingencies (Note 11)
Preferred stock, $0.01 par value; 50,000,000 shares authorized; no shares issued and outstanding as of December 31, 2021 and December 31, 2020
Additional paid-in capital	950,464	909,278
Accumulated deficit	(359,472)	(317,247)
Total stockholders' equity	592,096	593,061
Noncontrolling interests	103,078	112,821
Total equity	695,174	705,882
Total liabilities and equity	950,192	875,359
Class A Common Stock
Current liabilities
Common stock	942	868
Class B Common Stock
Current liabilities
Common stock	$ 162	$ 162

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 4,401	$ 9,157
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	94,172,920	86,812,647
Common Stock, Shares, Outstanding	94,172,920	86,812,647
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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue
Total revenue	$ 764,620	$ 605,105	$ 1,291,589
Costs of revenue
Depreciation and amortization	90,028	98,800	116,809
Total costs of revenue	743,760	634,370	1,142,849
Gross profit (loss)	20,860	(29,265)	148,740
Operating expenses
Selling, general and administrative	83,076	74,364	111,622
Depreciation and amortization	2,430	2,872	3,860
Impairment of goodwill and trademark		276,016	4,396
Impairment and abandonment of property and equipment		7,910	3,715
Lease abandonment costs	894	4,350	2,073
Total operating expenses	86,400	365,512	125,666
(Loss) income from operations	(65,540)	(394,777)	23,074
Other (expense) income
Loss on sales of property and equipment and divestitures, net	(2,068)	(2,815)	(11,626)
Interest expense, net	(1,711)	(2,136)	(2,688)
Foreign currency gain, net	2	39	273
Bargain purchase gain	18,985
Other income (expense), net	673	(3,519)	(2,948)
(Loss) income before income tax (expense) benefit	(49,659)	(403,208)	6,085
Income tax (expense) benefit	147	(1,476)	1,949
Equity in losses of unconsolidated entities	(279)
Net (loss) income	(50,085)	(401,732)	4,136
Less: net loss (income) attributable to noncontrolling interests	7,860	63,048	(1,352)
Net (loss) income attributable to Select Energy Services, Inc.	(42,225)	(338,684)	2,784
Water Services
Revenue
Total revenue	394,075	319,766	772,311
Costs of revenue
Costs of revenue	346,730	291,734	598,405
Operating expenses
Impairment of goodwill and trademark		186,468
Water Infrastructure
Revenue
Total revenue	154,789	125,356	221,593
Costs of revenue
Costs of revenue	115,887	99,546	166,962
Operating expenses
Impairment of goodwill and trademark		80,466
Oilfield Chemicals
Revenue
Total revenue	215,756	159,983	268,614
Costs of revenue
Costs of revenue	191,115	143,550	230,434
Operating expenses
Impairment of goodwill and trademark		9,082
Other
Revenue
Total revenue			29,071
Costs of revenue
Costs of revenue		740	30,239
Operating expenses
Impairment of goodwill and trademark			4,396
Class A Common Stock
Other (expense) income
Net (loss) income attributable to Select Energy Services, Inc.	$ (42,225)	$ (338,684)	$ 2,784
Net (loss) income per share attributable to common stockholders (Note 17):
Basic	$ (0.48)	$ (3.98)	$ 0.03
Diluted	$ (0.48)	$ (3.98)	$ 0.03

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net (loss) income	$ (50,085)	$ (401,732)	$ 4,136
Other comprehensive income
Foreign currency translation adjustment, net of tax of $0			368
Comprehensive (loss) income	(50,085)	(401,732)	4,504
Less: comprehensive loss (income) attributable to noncontrolling interests	7,860	63,048	(1,472)
Comprehensive (loss) income attributable to Select Energy Services, Inc.	$ (42,225)	$ (338,684)	$ 3,032

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Foreign currency translation adjustment, tax amount	$ 0	$ 0	$ 0

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Class A Common StockConversion of Class B to Class ACommon Stock	Class A Common StockCommon Stock	Class B Common StockConversion of Class B to Class ACommon Stock	Class B Common StockCommon Stock	Conversion of Class B to Class ATotal Stockholders' Equity	Conversion of Class B to Class AAdditional Paid-In Capital	Conversion of Class B to Class ANoncontrolling Interests.	Total Stockholders' Equity	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	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]
Exchange of SES Holdings LLC Units and Class B common stock for Class A common stock	$ 98		$ (98)		$ 107,062	$ 107,062	$ (107,062)
Exchange of SES Holdings LLC Units and Class B common stock for Class A common stock (in shares)	9,805,742		(9,805,742)
ESPP shares issued								154	154			(42)	112
ESPP shares issued (in shares)		13,178
Equity-based compensation								12,050	12,050			3,435	15,485
Issuance of restricted shares		$ 14						3,653	3,639			(3,653)
Issuance of restricted shares (in shares)		1,417,458
Exercise of restricted stock units								4	4			(4)
Exercise of restricted stock units (in shares)		1,250
Stock options exercised								84	84			(54)	30
Stock options exercised (in shares)		5,282
Repurchase of common stock		$ (23)						(21,962)	(21,939)			3,362	(18,600)
Repurchase of common stock ( in shares)		(2,288,880)
Restricted shares forfeited								(39)	(39)			39
Restricted shares forfeited (in shares)		(17,060)
Distributions to noncontrolling interests, net												(404)	(404)
NCI income tax adjustment								66	66			(66)
Foreign currency translation adjustment								387	19		$ 368	85	472
Net (loss) income								2,784		2,784		1,352	4,136
Ending balance at Dec. 31, 2019		$ 879		$ 162				937,177	914,699	21,437		175,635	1,112,812
Ending balance (in shares) at Dec. 31, 2019		87,893,525		16,221,101
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued								83	83			(7)	76
ESPP shares issued (in shares)		15,132
Equity-based compensation								4,856	4,856			908	5,764
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)						(12,292)	(12,270)			1,416	(10,876)
Repurchase of common stock ( in shares)		(2,199,824)
Restricted shares forfeited		$ (4)						(548)	(544)			548
Restricted shares forfeited (in shares)		(374,299)
Distributions to noncontrolling interests, net												(162)	(162)
NCI income tax adjustment								46	46			(46)
Net (loss) income								(338,684)		(338,684)		(63,048)	(401,732)
Ending balance at Dec. 31, 2020		$ 868		$ 162				593,061	909,278	(317,247)		112,821	705,882
Ending balance (in shares) at Dec. 31, 2020		86,812,647		16,221,101
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued								59	59			(1)	58
ESPP shares issued (in shares)		10,518
Equity-based compensation								8,036	8,036			1,433	9,469
Issuance of shares for acquisitions		$ 57						32,655	32,598			(532)	32,123
Issuance of shares for acquisition (in shares)		5,713,968
Shares issued to consultant								5	5				5
Shares issued to consultant (in shares)		738
Issuance of restricted shares		$ 22						2,184	2,162			(2,182)	2
Issuance of restricted shares (in shares)		2,154,897
Repurchase of common stock		$ (2)						(1,225)	(1,223)			19	(1,206)
Repurchase of common stock ( in shares)		(199,974)
Restricted shares forfeited		$ (3)						(335)	(332)			335
Restricted shares forfeited (in shares)		(319,874)
Distributions to noncontrolling interests, net								(140)	(140)			(934)	(1,074)
NCI income tax adjustment								21	21			(21)
Net (loss) income								(42,225)		(42,225)		(7,860)	(50,085)
Ending balance at Dec. 31, 2021		$ 942		$ 162				$ 592,096	$ 950,464	$ (359,472)		$ 103,078	$ 695,174
Ending balance (in shares) at Dec. 31, 2021		94,172,920		16,221,101

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net (loss) income	$ (50,085)	$ (401,732)	$ 4,136
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities
Depreciation and amortization	92,458	101,672	120,669
Net loss on disposal of property and equipment and divestitures	2,068	2,405	7,950
Equity in losses of unconsolidated entities	279
Bad debt (recovery) expense	(139)	6,373	2,553
Amortization of debt issuance costs	688	688	688
Inventory write-downs	239	852	250
Equity-based compensation	9,469	5,764	15,485
Impairment of goodwill and trademark		276,016	4,396
Impairment and abandonment of property and equipment		7,910	3,715
Bargain purchase gain	(18,985)
Loss on divestitures		410	3,676
Unrealized loss (gain) on short-term investment	2,044	(1,799)
Other operating items, net	(1,795)	(407)	240
Changes in operating assets and liabilities
Accounts receivable	(80,127)	142,873	57,908
Prepaid expenses and other assets	(15,108)	14,886	11,321
Accounts payable and accrued liabilities	42,746	(50,101)	(29,039)
Net cash (used in) provided by operating activities	(16,248)	105,810	203,948
Cash flows from investing activities
Working capital settlement			691
Proceeds from sale of securities	730
Proceeds received from divestitures		197	24,872
Purchase of property and equipment	(39,994)	(21,239)	(110,143)
Investment in note receivable	(1,101)	(3,000)
Purchase of equity method investments	(2,200)
Collection of note receivable	167
Distribution from cost method investment	180	200
Acquisitions, net of cash received	(34,740)		(10,000)
Proceeds received from sales of property and equipment	12,502	18,449	17,223
Net cash used in investing activities	(64,456)	(5,393)	(77,357)
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	(320)	(264)	(883)
Proceeds from share issuance	58	76	142
(Distributions to) contributions from noncontrolling interests	(1,074)	354	(349)
Repurchase of common stock	(1,206)	(10,876)	(18,600)
Net cash used in financing activities	(2,542)	(10,710)	(64,690)
Effect of exchange rate changes on cash	8	64	130
Net (decrease) increase in cash and cash equivalents	(83,238)	89,771	62,031
Cash and cash equivalents, beginning of period	169,039	79,268	17,237
Cash and cash equivalents, end of period	85,801	169,039	79,268
Supplemental cash flow disclosure:
Cash paid for interest	1,488	1,838	2,716
Cash (refunds received) paid for income taxes, net	(887)	(174)	1,793
Supplemental disclosure of noncash operating activities:
Noncash settlement of accounts receivable		1,578
Lease liabilities arising from obtaining right-of-use assets	8,665	9,322	119,358
Supplemental disclosure of noncash investing activities:
Issuance of shares for acquisitions	32,123
Capital expenditures included in accounts payable and accrued liabilities	$ 12,120	5,733	$ 10,472
Noncash proceeds received from sale of interest in a formerly consolidated joint venture		$ 367

BUSINESS AND BASIS OF PRESENTAT

BUSINESS AND BASIS OF PRESENTATION	12 Months Ended
	Dec. 31, 2021
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 and chemical 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. As a leader in the water solutions industry, we place the utmost importance on safe, environmentally responsible management of oilfield water throughout the lifecycle of a well. Additionally, we believe that responsibly managing water resources through our operations to help conserve and protect the environment in the communities in which we operate is paramount to our continued success. Class A and Class B Common Stock: Exchange rights: ​ Basis of presentation : The accompanying 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 SEC. The 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 in which the Company exercises significant influence over operating and financial policies are accounted for using the equity method, and investments in entities for which the Company does not have significant control or influence are accounted for using the cost-method or other appropriate basis as applicable. As of December 31, 2021, the Company had two equity method investments and one cost-method investment. The Company also had one investment in notes receivable accounted for using the amortized cost basis and one investment in publicly-traded securities accounted for using the fair value option. 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. Our investments in unconsolidated entities are summarized below and are included in the assets of our Water Services segment: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ​ ​ ​ As of December 31, Type of Investment attained Accounting method Balance Sheet Location ​ 2021 2020 ​ ​ ​ ​ ​ (in thousands) 20% minority interest 2011 Cost-method Other long-term assets, net ​ $ 120 ​ $ 300 Notes receivable 2020 Amortized cost basis Other long-term assets, net ​ ​ 4,446 ​ ​ 3,037 33% minority interest 2021 Equity-method Other long-term assets, net ​ ​ 1,779 ​ ​ — 45% minority interest 2021 Equity-method Other long-term assets, net ​ ​ 142 ​ ​ — Publicly traded securities 2020 Fair value option Prepaid expenses and other current assets ​ ​ 75 ​ ​ 3,377 ​ Segment reporting : 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 exploration and production (“E&P”) companies. Additionally, this segment includes the operations of our accommodations and rentals business as well as the Company’s industrial solutions business. The Water Infrastructure segment consists of the Company’s infrastructure assets, including operations associated with our water sourcing and pipeline infrastructure, our water recycling solutions and infrastructure, and our produced water gathering systems and saltwater disposal wells, primarily serving E&P companies. The Oilfield Chemicals segment provides technical solutions and expertise related to chemical applications in the oil and gas industry. We also have significant capabilities in supplying logistics for chemical applications. We develop, manufacture and apply a full suite of chemicals used in hydraulic fracturing, stimulation, cementing, production, pipelines and well completions. Given the breadth of chemicals and application expertise we provide, our customers range from pressure pumpers to major integrated and independent oil and gas producers. This segment also utilizes its chemicals experience and lab testing capabilities to customize tailored water treatment solutions designed to optimize the fracturing fluid system in conjunction with the quality of water used in well completions. 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 : Certain reclassifications have been made to the Company’s prior period consolidated financial information to conform to the current year presentation. These presentation changes did not impact the Company’s consolidated net income, consolidated cash flows, total assets, total liabilities or total stockholders’ equity.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2021
SIGNIFICANT ACCOUNTING POLICIES
SIGNIFICANT ACCOUNTING POLICIES	NOTE 2—SIGNIFICANT ACCOUNTING POLICIES 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 reserve, income taxes, self-insurance liabilities, share-based compensation, contingent liabilities, lease-related reasonably certain option exercise assessments, 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. Cash and cash equivalents : The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents. Accounts receivable : Accounts receivable are stated at the invoiced amount, or the earned but not yet invoiced amount, net of an allowance for credit losses. Allowance for credit losses: ​ The change in the allowance for credit losses is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Balance at beginning of year ​ $ 9,157 $ 5,773 $ 5,329 Increase to allowance based on a percentage of revenue ​ 1,477 1,212 2,641 Adjustment based on aged receivable analysis ​ ​ (1,444) ​ ​ 5,161 ​ ​ (88) Charge-offs ​ (4,793) (3,003) (2,504) Recoveries ​ ​ 4 14 395 Balance at end of year ​ $ 4,401 $ 9,157 $ 5,773 ​ The Company also has a $4.4 million note receivable resulting from an initial investment in 2020 and additional investment in 2021, with no allowance for credit losses as of December 31, 2021. See “Note 14 – Related Party Transactions” for additional information. ​ Concentrations of credit and customer risk : Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and trade accounts receivable. The amounts held in financial institutions periodically exceed the federally insured limit. Management believes that the financial institutions are financially sound and the risk of loss is minimal. The Company minimizes its exposure to counterparty credit risk by performing credit evaluations and ongoing monitoring of the financial stability of its customers. There were Inventories : The Company values its inventories at lower of cost or net realizable value. Inventory costs are determined under the weighted-average method. Inventory costs primarily consist of chemicals and materials available for resale and parts and consumables used in operations. Property and equipment : Property and equipment are stated at cost less accumulated depreciation. ​ ​ Depreciation (and amortization of finance lease assets) is calculated on a straight-line basis over the estimated useful life of each asset as noted below: ​ ​ ​ ​ Asset Classification Useful Life (years) Land Indefinite Buildings and leasehold improvements 30 or lease term Vehicles and equipment 4 - 7 or lease term Machinery and equipment 2 - 12 Pipelines ​ 15 Computer equipment and software 3 - 4 or lease term Office furniture and equipment 7 Disposal wells 7 - 10 ​ Depreciation expense related to the Company’s property and equipment, including amortization of property under finance leases, was $81.6 million, $90.2 million and $108.7 million for the years ended December 31, 2021, 2020 and 2019, respectively. Change in depreciable lives of property and equipment: Business Combinations: Goodwill and other intangible assets : Goodwill represents the excess of the purchase price of acquisitions over the fair value of the net assets acquired. Goodwill and other intangible assets not subject to amortization are tested for impairment annually or more frequently if events or changes in circumstances indicate that the asset might be impaired. Intangible assets with finite useful lives are amortized either on a straight-line basis over the asset’s estimated useful life or on a basis that reflects the pattern in which the economic benefits of the intangible assets are realized. Impairment of goodwill, long-lived assets and intangible assets : Long-lived assets, such as property and equipment and finite-lived intangible assets, are evaluated for impairment whenever events or changes in circumstances indicate that its carrying value may not be recoverable. Recoverability is measured by a comparison of its carrying amount to the estimated undiscounted cash flows to be generated by those assets. If the undiscounted cash flows are less than the carrying amount, the Company records impairment losses for the excess of its carrying value over the estimated fair value. The development of future cash flows and the estimate of fair value represent its best estimates based on industry trends and reference to market transactions and are subject to variability. The Company considers the factors within the fair value analysis to be Level 3 inputs within the fair value hierarchy. See “Note 4—Impairments and Other Costs” for further discussion. ​ The Company conducts its annual goodwill impairment tests in the fourth quarter of each year, and whenever impairment indicators arise, by examining relevant events and circumstances which could have a negative impact on its goodwill such as macroeconomic conditions, industry and market conditions, cost factors that have a negative effect on earnings and cash flows, overall financial performance, acquisitions and divestitures and other relevant entity-specific events. If a qualitative assessment indicates that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, the Company is required to perform a quantitative impairment test for goodwill comparing the reporting unit’s carrying value to its fair value. The Company’s reporting units are based on its organizational and reporting structure. In determining fair values for the reporting units, the Company relies primarily on the income and market approaches for valuation. In the income approach, the Company discounts predicted future cash flows using a weighted-average cost of capital calculation based on publicly-traded peer companies. In the market approach, valuation multiples are developed from both publicly-traded peer companies as well as other company transactions. The cost approach, when used, considers replacement cost as the primary indicator of value. If the fair value of a reporting unit is less than its carrying value, goodwill impairment is calculated by subtracting the fair value of the reporting unit from the carrying value. Application of the goodwill impairment test requires judgment, including the identification of reporting units, allocation of assets (including goodwill) and liabilities to reporting units and determining the fair value. The determination of reporting unit fair value relies upon certain estimates and assumptions that are complex and are affected by numerous factors, including the general economic environment and levels of E&P activity of oil and gas companies, the Company’s financial performance and trends and the Company’s strategies and business plans, among others. Unanticipated changes, including immaterial revisions, to these assumptions, could result in a provision for impairment in a future period. Given the nature of these evaluations and their application to specific assets and time frames, it is not possible to reasonably quantify the impact of changes in these assumptions. See “Note 4—Impairments and Other Costs” for further discussion. ​ Asset retirement obligations : The asset retirement obligation (“ARO”) liability reflects the present value of estimated costs of plugging, site reclamation and similar activities associated with the Company’s saltwater disposal wells. The Company utilizes current retirement costs to estimate the expected cash outflows for retirement obligations. The Company also estimates the productive life of the disposal wells, a credit-adjusted risk-free discount rate and an inflation factor in order to determine the current present value of this obligation. The Company’s ARO liabilities are included in accrued expenses and other current liabilities and other long-term liabilities as of December 31, 2021, and 2020. The change in asset retirement obligations is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ ​ 2021 2020 ​ ​ (in thousands) Balance at beginning of year ​ $ 999 $ 1,527 Accretion expense, included in depreciation and amortization expense ​ ​ 208 ​ 121 Acquired ARO's ​ ​ 30,672 ​ — Disposals ​ ​ ​ (1,852) ​ ​ (272) Payments ​ ​ ​ (476) ​ ​ (377) Balance at end of year ​ $ 29,551 $ 999 ​ ​ ​ ​ ​ ​ ​ ​ Short-term ARO liability ​ ​ ​ 4,888 ​ ​ 189 Long-term ARO liability ​ ​ ​ 24,663 ​ ​ 810 Balance at end of year ​ ​ $ 29,551 ​ $ 999 ​ In addition to the obligations described above, the Company may be obligated to remove facilities or perform other remediation upon retirement of certain other assets. However, the fair value of the asset retirement obligation cannot currently be reasonably estimated because the settlement dates are indeterminable. If applicable, the Company will record an asset retirement obligation for these assets in the periods in which settlement dates are reasonably determinable. Retentions : The Company assumes risk of loss through deductibles and self-insured retentions, up to certain levels for losses related to general liability, workers’ compensation and employer’s liability, vehicle liability, and effective June 1, 2020, health insurance. The Company’s exposure (i.e., the self-insured retention or deductible) per occurrence is coverages with a limit of $100.0 million in the aggregate. Management regularly reviews its estimates of reported and unreported claims and provide for losses through reserves. As of December 31, 2021, the Company estimated the range of exposure to be from $12.2 million to $14.3 million for worker’s compensation and vehicle liability claims and have recorded liabilities of $13.2 million, which represents management’s best estimate of probable loss related to these claims. Additionally, accrued health insurance and accrued general liabilities were $2.9 million and $0.5 million as of December 31, 2021, respectively. These liabilities are included in accrued insurance and other long-term liabilities depending on whether they are short or long-term in nature. Defined Contribution Plan : The Company sponsors a defined contribution 401(k) Profit Sharing Plan (the “401(k) Plan”) for the benefit of substantially all employees of the Company. The 401(k) Plan allows eligible employees to make tax-deferred contributions, not to exceed annual limits established by the Internal Revenue Service. The During the year ended December 31, 2020, due to worsening economic conditions, the Company suspended the match of its 401(k) Plan and the suspension continued into the first half of 2021. Effective July 1, 2021, the Company reinstated matching contributions of Payroll Tax Deferral: million must be repaid by December 31, 2022. The remaining deferral is reported under accrued salaries and benefits on the accompanying consolidated balance sheets as of December 31, 2021. Revenue recognition : The Company follows ASU 2014-09, Revenue from Contracts with Customers (Topic 606). . Water Services and Water Infrastructure The Company’s agreements with its customers are often referred to as “price sheets” and sometimes provide pricing for multiple services. However, these agreements generally do not authorize the performance of specific services or provide for guaranteed throughput amounts. As customers are free to choose which services, if any, to use based on the Company’s price sheet, the Company prices its separate services on the basis of their standalone selling prices. Customer agreements generally do not provide for performance-, cancellation-, termination-, or refund-type provisions. Services based on price sheets with customers are generally performed under separately-issued “work orders” or “field tickets” as services are requested. Of the Company’s Water Services and Water Infrastructure service lines, only sourcing and transfer of water are consistently provided as part of the same arrangement. In these instances, revenue for both sourcing and transfer are recognized concurrently when delivered. Additionally, asset rentals are recognized on a straight-line basis. Oilfield Chemical Product Sales— Oilfield Chemicals products are generally sold under sales agreements based upon purchase orders or contracts with customers that do not include right of return provisions or other significant post-delivery obligations. The Company’s products are produced in a standard manufacturing operation, even if produced to the customer’s specifications. The prices of products are fixed and determinable and are established in price lists or customer purchase orders. The Company recognizes revenue from product sales when title passes to the customer, the customer assumes risks and rewards of ownership, collectability is reasonably assured and delivery occurs as directed by the customer. Equity-based compensation : The Company accounts for equity-based awards for restricted stock awards, restricted stock units, and stock-settled appreciation awards by measuring the awards at the date of grant and recognizing the grant-date fair value as an expense using either straight-line or accelerated attribution, depending on the specific terms of the award agreements over the requisite service period, which is usually equivalent to the vesting period. The Company expenses awards with graded-vesting service conditions on a straight-line basis and accounts for forfeitures as they occur. The Company accounts for performance share units by remeasuring the awards at the end of each reporting period based on the period-end closing share price, factoring in the percentage expected to vest, and the percentage of the service period completed. Fair value measurements : The Company measures certain assets and liabilities pursuant to accounting guidance, which establishes a three-tier fair value hierarchy and prioritizes the inputs used in measuring fair value. Level 1 inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 inputs are quoted prices or other market data for similar assets and liabilities in active markets, or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the asset or liability. Level 3 inputs are unobservable inputs based upon the Company’s own judgment and assumptions used to measure assets and liabilities at fair value. See “Note 13—Fair Value Measurement” for further discussion. Income taxes The Company and its subsidiaries account for income taxes under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled pursuant to the provisions of Accounting Standards Codification (“ASC”) 740, Income Taxes. The effect on deferred tax assets and liabilities of a change in tax rate is recognized in earnings in the period that includes the enactment date. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts more likely than not to be realized. The determination of the provision for income taxes requires significant judgment, use of estimates and the interpretation and application of complex tax laws. Significant judgment is required in assessing the timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions. The benefits of uncertain tax positions are recorded in the Company’s financial statements only after determining a more likely than not probability that the uncertain tax positions will withstand challenge, if any, from taxing authorities. When facts and circumstances change, the Company reassesses these probabilities and records any changes through the provision for income taxes. The Company recognizes interest and penalties relating to uncertain tax provisions as a component of tax expense. The Company identified no material uncertain tax positions as of December 31, 2021, 2020 and 2019. See “Note 15—Income Taxes” for further discussion.

ACQUISITIONS AND DIVESTITURES

ACQUISITIONS AND DIVESTITURES	12 Months Ended
	Dec. 31, 2021
ACQUISITIONS AND DIVESTITURES
ACQUISITIONS AND DIVESTITURES	NOTE 3—ACQUISITIONS AND DIVESTITURES Business combinations The following table presents key information connected with our 2021 acquisitions (dollars in thousands, except share amounts): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets and Operations Acquired Acquisition Date Shares Issued ​ Cash Consideration ​ Contingent Consideration ​ Value of Shares Issued ​ Total Initial Consideration Segments HB Rentals December 3, 2021 1,211,375 $ 1,526 $ — $ 7,135 $ 8,661 Water Services Agua Libre and Basic October 1, 2021 902,593 ​ 16,394 ​ — ​ 4,684 ​ 21,078 Water Services & Water Infrastructure UltRecovery August 2, 2021 — ​ 2,500 ​ 1,058 ​ — ​ 3,558 Oilfield Chemicals Complete July 9, 2021 3,600,000 ​ 14,356 ​ — ​ 20,304 ​ 34,660 Water Services & Water Infrastructure Total ​ 5,713,968 $ 34,776 $ 1,058 $ 32,123 $ 67,957 ​ ​ HB Rentals Acquisition On December 3, 2021, the Company, through its subsidiary Peak Oilfield Services, LLC, completed the acquisition of certain assets of H.B. Rentals, L.C. (“HB Rentals”), an operating subsidiary of Superior Energy Services, Inc. (“Superior”) for total initial consideration of $8.7 million based on the closing price of the Company’s shares of Class A Common Stock on December 2, 2021 (the “HB Rentals Acquisition”). Consideration transferred consisted of 1,211,375 shares of Class A Common Stock and $1.5 million in cash. The Company acquired the U.S. onshore assets of HB Rentals, including working capital, and the final purchase price is subject to standard post-closing adjustments. This acquisition strengthens the Company’s accommodations and rentals footprint in the Permian, Haynesville, MidCon, Northeast and Rockies region and adds revenue-producing fixed assets including a significant number of skid houses and trailer houses. The acquisition is expected to result in a bargain purchase in part due to the seller recently emerging from bankruptcy and deciding to divest domestic assets and operations and focus on international operations. The HB Rentals 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 estimates, judgments and assumptions. These estimates, judgments and assumptions and valuation of the property and equipment acquired, current assets, current liabilities and long-term liabilities have not been finalized as of December 31, 2021. The business combination accounting is preliminary due to the continuing efforts to validate the existence and condition of the property and equipment acquired as well as to finalize the working capital settlement. The assets acquired and liabilities assumed are included in the Company’s Water Services 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: ​ ​ ​ ​ ​ Preliminary purchase price allocation Amount Consideration transferred (in thousands) Class A Common Stock (1,211,375 shares) ​ $ 7,135 Cash paid ​ 1,526 Total consideration transferred ​ 8,661 Less: identifiable assets acquired and liabilities assumed ​ Working capital ​ 29 Property and equipment ​ 14,091 Right-of-use assets ​ 1,316 Long-term lease liabilities ​ ​ (835) Total identifiable net assets acquired ​ 14,601 Bargain Purchase Gain ​ (5,940) Fair value allocated to net assets acquired, net of bargain purchase gain $ 8,661 ​ Agua Libre Midstream and water-related assets from Basic Energy Services Acquisition On October 1, 2021, the Company completed the acquisition of certain assets of Agua Libre Midstream, LLC (“Agua Libre”) and other water-related assets, operations and assumed liabilities from Basic Energy Services, Inc. (“Basic”) for total initial consideration of $21.1 million based on the closing price of the Company’s shares of Class A Common Stock on September 30, 2021 (the “Agua Libre and Basic Acquisition”). Consideration transferred consisted of 902,593 shares of Class A Common Stock and $16.4 million in cash. The Company acquired substantially all of the water-related assets and ongoing operations of Agua Libre and Basic, including working capital, and is subject to standard post-closing adjustments. With this acquisition, the Company has acquired a solid production services footprint in Texas, New Mexico, Oklahoma and North Dakota, as well as more than 550,000 barrels per day of permitted disposal capacity. The acquisition is expected to result in a bargain purchase as the seller was distressed and decided to divest its assets and operations to multiple buyers as operations were wound down and the business was shuttered. The Agua Libre and Basic 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 estimates, judgments and assumptions. The Company also engaged third-party valuation experts to assist in the purchase price allocation. These estimates, judgments and assumptions and valuation of the property and equipment acquired, current assets, current liabilities and long-term liabilities have not been finalized as of December 31, 2021. The business combination accounting is preliminary due to the continuing efforts to validate the existence and condition of the property and equipment acquired as well as to finalize the working capital settlement. The assets acquired and liabilities assumed are included in the Company’s Water Services and Water Infrastructure segments. For the year ended December 31, 2021, the Company expensed $2.2 million of transaction-related costs which are included in selling, general and administrative within the consolidated statement of operations. ​ ​ ​ ​ ​ ​ The following table summarizes the consideration transferred and the estimated fair value of identified assets acquired and liabilities assumed at the date of acquisition: ​ ​ ​ ​ ​ Preliminary purchase price allocation ​ Amount Consideration transferred ​ (in thousands) Class A Common Stock (902,593 shares) ​ $ 4,684 Cash paid ​ ​ 16,394 Total consideration transferred ​ 21,078 Less: identifiable assets acquired and liabilities assumed ​ ​ Working capital ​ (506) Property and equipment ​ 41,000 Right-of-use assets ​ 309 Long-term ARO ​ ​ (15,810) Long-term lease liabilities ​ ​ (281) Total identifiable net assets acquired ​ ​ 24,712 Bargain Purchase Gain ​ (3,634) Fair value allocated to net assets acquired, net of bargain purchase gain $ 21,078 ​ UltRecovery Acquisition ​ On August 2, 2021, the Company acquired substantially all of the assets of UltRecovery Corporation (“UltRecovery”), a provider of sustainable production enhancement applications focused on existing conventional and unconventional oil and gas wells (the “UltRecovery Acquisition”). The Company paid consideration of $2.5 million at closing, and the selling shareholders may earn contingent consideration in the form of an earn-out. The estimated liability of the earn-out is $1.1 million and the maximum earn-out is $1.6 million, dependent on revenue generated in the first and second 12-month periods following the acquisition, beginning on October 1, 2021. The acquisition expands our chemical solution offerings through a patented platform of sustainable novel biotechnologies designed to uplift production decline curves and increase recoverable reserves. ​ The UltRecovery Acquisition was accounted for as a business combination under the acquisition method of accounting. When determining the fair values of assets acquired management made estimates, judgments and assumptions. These estimates, judgments and assumptions and valuation of the inventory, property and equipment and intellectual property acquired have been finalized as of December 31, 2021. The assets acquired 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 at the date of acquisition: ​ ​ ​ ​ ​ Purchase price allocation Amount Consideration transferred and estimated earn-out liability (in thousands) Cash paid ​ $ 2,500 Estimated earn-out liability assumed ​ ​ 1,058 Total purchase price ​ 3,558 Less: identifiable assets acquired ​ Inventory ​ 13 Property and equipment ​ 514 Patents and other intellectual property ​ 3,031 Total identifiable net assets acquired ​ 3,558 Fair value allocated to net assets acquired ​ $ 3,558 ​ ​ Complete Energy Services Acquisition ​ On July 9, 2021, the Company completed the acquisition (the “Complete Acquisition”) of Complete Energy Services, Inc. (“Complete”), an operating subsidiary of Superior Energy Services, Inc. (“Superior”) for initial consideration of $34.5 million based on the closing price of the Company’s shares of Class A Common Stock on July 9, 2021. Consideration transferred consisted of 3.6 million shares of Class A Common Stock and $14.2 million in cash. In October 2021, the Company paid $0.2 million related to the settlement of the working capital which resulted in a final purchase price of $34.7 million. The Company acquired substantially all of the water-related assets, liabilities and ongoing operations of Complete as well as Superior’s well testing operations, including working capital. Superior retained certain non-core and non-water-related assets that were part of Complete as part of the transaction. This acquisition expands the Company’s water-related services and infrastructure footprint and strengthens the geographic footprint, particularly in the Mid-Continent, Permian and Rockies. The acquisition is expected to result in a bargain purchase in part due to the seller recently emerging from bankruptcy and deciding to divest domestic assets and operations and focus on international operations. ​ The Complete 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 estimates, judgments and assumptions. The Company also engaged third-party valuation experts to assist in the purchase price allocation. These estimates, judgments and assumptions and valuation of the property and equipment acquired, current assets, current liabilities and long-term liabilities have not been finalized as of December 31, 2021. The business combination accounting is preliminary due to the continuing efforts to validate the existence and condition of the property and equipment acquired. The assets acquired and liabilities assumed are included in the Company’s Water Services and Water Infrastructure segments. For the year ended December 31, 2021, the Company expensed $1.2 million of transaction-related costs which are included in selling, general and administrative within the consolidated statement of operations. ​ The following table summarizes the consideration transferred and the estimated fair value of identified assets acquired and liabilities assumed at the date of acquisition: ​ ​ ​ ​ ​ Preliminary purchase price allocation ​ Amount Consideration transferred ​ (in thousands) Class A Common Stock (3,600,000 shares) ​ $ 20,304 Cash paid ​ ​ 14,356 Total consideration transferred ​ 34,660 Less: identifiable assets acquired and liabilities assumed ​ ​ Working capital ​ 15,783 Property and equipment ​ 36,761 Right-of-use assets ​ 3,331 Other long-term assets ​ ​ 24 Long-term ARO ​ ​ (9,800) Long-term lease liabilities ​ ​ (2,028) Total identifiable net assets acquired ​ ​ 44,071 Bargain Purchase Gain ​ (9,411) Fair value allocated to net assets acquired, net of bargain purchase gain $ 34,660 ​ ​ Well Chemical Services Acquisition ​ On September 30, 2019, the Company acquired a well chemical services business (“WCS”) 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 expanded the Company’s service offerings in oilfield water treatment across the full lifecycle 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 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 ​ Divestitures ​ Affirm and Canadian Operations Divestitures ​ During the year ended December 31, 2019, the Company closed on four sale transactions and wound down the remaining Affirm and Canadian operations. The Company sold property and equipment with a combined net book value of $18.6 million and assigned contracts to the buyers. Additionally, two of the four transactions included the assignment of working capital. The following table summarizes sales details for each of the four transactions: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Date of Divestiture ​ Entity ​ Initial Net Proceeds ​ Working Capital True Up ​ Adjusted Net Proceeds ​ Working Capital Status at December 31, 2019 ​ (Gain)/loss for the year ended December 31, 2019 ​ ​ ​ ​ (in thousands) February 26, 2019 ​ Affirm ​ $ 10,982 ​ $ (208) ​ $ 10,774 ​ Final ​ $ 208 June 28, 2019 ​ Affirm ​ ​ 6,968 ​ ​ — ​ ​ 6,968 ​ Final ​ ​ (1,646) March 19, 2019 ​ Canada ​ ​ 4,975 ​ ​ (302) ​ ​ 4,673 ​ Final ​ ​ 5,013 April 1, 2019 ​ Canada ​ ​ 2,242 ​ ​ — ​ ​ 2,242 ​ Final ​ ​ 101 ​ In connection with the Affirm crane operation divestiture in 2019, no gain or loss was initially recognized and goodwill was reduced by $2.6 million. Additionally, during 2019, the Company recorded an impairment of the remaining Affirm goodwill of $4.4 million (see “Note 9—Goodwill and Other Intangible Assets”). ​

IMPAIRMENTS AND OTHER COSTS

IMPAIRMENTS AND OTHER COSTS	12 Months Ended
	Dec. 31, 2021
IMPAIRMENTS AND OTHER COSTS
IMPAIRMENTS AND OTHER COSTS	NOTE 4—IMPAIRMENTS AND OTHER COSTS ​ Significant challenges that emerged during the year ended December 31, 2020 had a negative impact on our results of operations. The COVID-19 pandemic caused a worldwide slowdown in economic activity, resulting in a sharp decline in global oil and natural gas demand and therefore, lower oil and natural gas prices. Reduced demand for our services had a material, negative impact on our financial results for the year ended December 31, 2020. As a result of the downturn in our business, we recorded impairment expenses in the second quarter of 2020 to goodwill, property and equipment and other intangible assets. ​ A summary of impairments to goodwill and trademark for the years ended December 31, 2021, 2020 and 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2021 ​ 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 9—Goodwill and Other Intangible Assets.” ​ A summary of impairments to and abandonment of property and equipment for the years ended December 31, 2021, 2020 and 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Impairment and abandonment of property and equipment ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ — ​ $ 3,894 ​ $ 969 Water Infrastructure ​ ​ — ​ ​ 4,016 ​ ​ 1,804 Other ​ ​ — ​ ​ — ​ ​ 942 Total impairment and abandonment of property and equipment ​ $ — ​ $ 7,910 ​ $ 3,715 ​ For the year ended December 31, 2020, impairment and abandonment costs of $7.9 million were comprised of leasehold improvements related to abandoned facilities, abandonment of certain saltwater and freshwater wells and obsolete machinery and equipment. For the year ended December 31, 2019, the Company impaired $3.7 million of property and equipment as the carrying values were not deemed recoverable including $1.1 million of pipelines with low utilization, $1.0 million of layflat hose considered obsolete, $0.9 million related to divesting Canadian fixed assets, and $0.6 million related to an owned facility for sale . ​ A summary of severance, yard closure, and lease abandonment costs for the years ended December 31, 2021, 2020 and 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ ​ 2021 ​ 2020 2019 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Severance ​ ​ ​ ​ ​ ​ ​ ​ ​ Costs of revenue - Water services ​ $ — ​ $ 2,929 ​ $ — Costs of revenue - Water infrastructure ​ ​ — ​ ​ 452 ​ ​ — Costs of revenue - Oilfield chemicals ​ ​ — ​ ​ 626 ​ ​ — Selling, general and administrative ​ ​ 3,225 ​ ​ 3,161 ​ ​ 1,691 Total severance expense ​ $ 3,225 ​ $ 7,168 ​ $ 1,691 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Yard closure costs ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ — ​ $ 2,645 ​ $ — Oilfield Chemicals ​ ​ — ​ ​ 316 ​ ​ — Total yard closure costs ​ $ — ​ $ 2,961 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease abandonment costs ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 888 ​ $ 4,321 ​ $ 1,218 Water Infrastructure ​ ​ 1 ​ ​ 51 ​ ​ — Oilfield Chemicals ​ ​ — ​ ​ 42 ​ ​ 11 Other ​ ​ 5 ​ ​ (64) ​ ​ 844 Total lease abandonment costs ​ $ 894 ​ $ 4,350 ​ $ 2,073 ​ During the year ended December 31, 2021, the Company incurred $3.2 million of severance cost in connection with the termination of its former chief executive officer, which was paid in full during 2021. ​ During the year ended December 31, 2020, the Company recorded exit-disposal costs including $7.2 million of severance costs, with $0.6 million of accrued severance as of December 31, 2020 recorded as accrued salary and benefits on the accompanying consolidated balance sheets, $3.0 million in yard closure costs recognized within costs of revenue on the accompanying consolidated statements of operations with $0.1 million accrued yard closure costs as of December 31, 2020, recorded as accrued expenses and other current liabilities on the accompanying consolidated balance sheets, and $4.4 million of lease abandonment costs. The remaining $0.1 million of accrued yard closure costs was paid in 2021, and the Company continues to make lease payments in connection with abandoned leases over the life of the lease. ​ During the year ended December 31, 2019, the Company recorded exit-disposal costs including $1.7 million of severance costs and $2.1 million of lease abandonment costs, both of which primarily related to the Company’s divested service lines. Lease abandonment costs also included the abandonment of two facilities and accretion of expenses for previously abandoned facilities.

REVENUE

REVENUE	12 Months Ended
	Dec. 31, 2021
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 years 2021, 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 services rendered and 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. Mobilization and demobilization are factored into the pricing for services. Billings and costs related to mobilization and demobilization are not material for customer agreements that start in one period and end in another. As of December 31, 2021, the Company had six contracts in place for these segments lasting over one year. As of both December 31, 2021 and 2020, the Company had recorded an $8.2 million contract liability associated with one of the six long-term contracts, recognized in other long-term liabilities in the accompanying consolidated balance sheets. Accommodations and rentals revenue is included in the Water Services segment and 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 December 31, 2021, there were no material rental agreements in effect lasting more than one year. During 2021, 2020 and 2019, approximately $31.4 million, $28.4 million and $69.0 million of accommodations and rentals revenue was accounted for under ASC 842 lease guidance, with the remainder accounted for under ASC 606 revenue guidance. 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 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 material in-process customer agreements for this segment as of December 31, 2021 lasting greater than one year. The following table sets forth certain financial information with respect to the Company’s disaggregation of revenues by geographic location: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Geographic Region ​ ​ ​ ​ ​ ​ ​ ​ ​ Permian Basin ​ $ 371,067 ​ $ 278,439 ​ $ 610,528 Eagle Ford ​ ​ 99,656 ​ ​ 69,440 ​ ​ 156,621 Rockies ​ ​ 78,189 ​ ​ 37,517 ​ ​ 85,339 Haynesville/E. Texas ​ ​ 74,797 ​ ​ 73,116 ​ ​ 73,658 Mid-Continent ​ ​ 64,912 ​ ​ 56,687 ​ ​ 176,216 Marcellus/Utica ​ ​ 62,508 ​ ​ 54,473 ​ ​ 96,454 Bakken ​ ​ 19,077 ​ ​ 38,986 ​ ​ 92,956 Eliminations and other regions ​ ​ (5,586) ​ ​ (3,553) ​ ​ (183) Total ​ $ 764,620 ​ $ 605,105 ​ $ 1,291,589 ​ In the Water Services segment, the top four revenue-producing regions are the Permian Basin, Eagle Ford, Marcellus/Utica and Rockies, which collectively comprised 85%, 79% and 80% of segment revenue for 2021, 2020 and 2019, respectively. In the Water Infrastructure segment, the top three revenue-producing regions are the Permian Basin, Eagle Ford and Bakken, which collectively comprised 95%, 97% and 93% of segment revenue for 2021, 2020 and 2019, respectively. In the Oilfield Chemicals segment, the top three revenue-producing regions are the Permian Basin, Haynesville/E. Texas and MidCon, which collectively comprised 82%, 87% and 89% of segment revenue for 2021, 2020 and 2019, respectively.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2021
LEASES
LEASES	NOTE 6—LEASES As of December 31, 2021, the Company was the lessee for 303 operating leases with durations greater than a year, 12 one The Company’s operating leases are primarily for (i) housing personnel for operations, (ii) operational yards for storing and staging equipment, (iii) vehicles and equipment used in operations, (iv) facilities used for back-office functions and (v) equipment used for back-office functions. The majority of the Company’s long-term lease expenses are at fixed prices. During 2020, due to the future uncertainty stemming from the onset of the COVID-19 pandemic, certain renewal options were no longer considered reasonably certain of being exercised. This caused a reduction of approximately $5.7 million in right-of-use assets and lease liabilities on the consolidated balance sheets during the second quarter of 2020. Additionally, during the second quarter of 2020, the Company successfully negotiated certain lease payment deferrals as well as lease payment reductions that were accounted for as modifications, with no impact to straight-line lease expense from lease payment deferrals and a reduction in straight-line rent expense from lease payment reductions. ​ Leases with an initial term of 12 months or less are not recorded on the consolidated balance sheets and the Company recognizes lease expense for these leases on a straight-line basis over the lease term. The Company has a significant number of short-term leases, including month-to-month agreements, some of which continue in perpetuity until the lessor or the Company terminates the lease agreement. The majority of the Company’s lease expenses are in connection with short-term agreements, including expenses incurred hourly, daily, monthly and for other durations of time of one year or less. Due to the volatility of the price of a barrel of oil and the short-term nature of the vast majority of customer agreements, the Company must have flexibility to continuously scale operations at multiple locations. Consequently, the Company avoids committing to long-term agreements with numerous equipment rentals, vehicle fleet agreements and man-camp agreements, unless a business case supports a longer term agreement. Consequently, the Company’s future lease commitments as of December 31, 2021 do not reflect all of the Company’s short-term lease commitments. Certain short-term and month-to-month vehicle and equipment leases have residual value guarantees if the Company decides to turn in vehicles and equipment before the end of the lease term. Vehicles and equipment turned in early result in sale proceeds, which have historically been equal to or greater than the residual value guarantees. There are no residual value guarantees if the vehicles or equipment is fully paid off. When available, the Company uses the rate implicit in the lease to discount lease payments to present value; however, most of the Company’s leases do not provide a readily determinable implicit rate. Therefore, the Company estimates the incremental borrowing rate based on what it would pay to borrow on a collateralized basis, over a similar term based on information available at lease commencement. The Company’s lease arrangements may contain both lease and non-lease components. The Company has elected to combine and account for lease and non-lease components as a single lease component for its leases. The Company’s variable lease costs are comprised of variable royalties, variable common area maintenance, and variable reimbursement of lessor insurance and property taxes. Variable lease costs were $1.3 million, $1.1 million and $1.6 million during the years ended December 31, 2021, 2020 and 2019, respectively. Property tax expense of The lease disclosures in this “Note 6—Leases” exclude revenue governed by the lease standard associated with the Company’s accommodations and rentals business, as all customer agreements are short-term. See “Note 5—Revenue” for a comprehensive discussion on revenue recognition. The financial impact of leases is listed in the tables below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance Sheet Classification December 31, 2021 ​ December 31, 2020 ​ ​ ​ ​ (in thousands) Assets ​ ​ ​ ​ ​ ​ ​ ​ Right-of-use assets (1) ​ Long-term right-of-use assets ​ $ 47,732 ​ $ 52,331 Finance lease assets ​ Property and equipment ​ ​ 134 ​ ​ 302 Liabilities ​ ​ ​ ​ ​ ​ ​ ​ Operating lease liabilities ― ST ​ Current operating lease liabilities ​ $ 13,997 ​ $ 14,019 Operating lease liabilities ― LT ​ Long-term operating lease liabilities ​ ​ 53,198 ​ ​ 60,984 Finance lease liabilities ― ST ​ Current portion of finance lease obligations ​ ​ 113 ​ ​ 307 Finance lease liabilities ― LT ​ Other long term liabilities ​ ​ 24 ​ ​ 94 ​ (1) Right-of-use asset impairment of $0 , $3.6 million and $0.6 million for the years ended December 31, 2021, 2020 and 2019, respectively, is recorded within lease abandonment costs in the accompanying consolidated statements of operations. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, Statements of Operations and Cash Flows Classification 2021 ​ 2020 ​ 2019 ​ ​ ​ ​ (in thousands) Operating lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease cost ― fixed ​ Cost of revenue and Selling, general and administrative ​ $ 13,762 ​ $ 19,968 ​ $ 27,856 Lease abandonment costs ​ Lease abandonment costs ​ ​ 894 ​ ​ 4,350 ​ ​ 2,073 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Short-term agreements: ​ Cost of revenue ​ $ 54,301 ​ $ 44,062 ​ $ 93,949 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Finance lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortization of leased assets ​ Depreciation and amortization ​ $ 230 ​ $ 314 ​ $ 916 Interest on lease liabilities ​ Interest expense, net ​ ​ 10 ​ ​ 14 ​ ​ 32 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lessor income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Sublease income ​ Cost of sales and lease abandonment costs ​ $ 1,080 ​ $ 1,463 ​ $ 1,544 Lessor income ​ Cost of sales ​ ​ 335 ​ ​ 350 ​ ​ 478 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Statement of cash flows ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for operating leases ​ Operating cash flows ​ $ 19,004 ​ $ 22,385 ​ $ 30,670 Cash paid for finance leases lease interest ​ Operating cash flows ​ ​ 10 ​ ​ 14 ​ ​ 32 Cash paid for finance leases ​ Financing cash flows ​ ​ 320 ​ ​ 264 ​ ​ 883 ​ ​ ​ ​ ​ ​ ​ ​ ​ Long Term and Discount Rate As of December 31, 2021 As of December 31, 2020 Weighted-average remaining lease term (years) ​ ​ ​ ​ ​ ​ Operating leases ​ 5.9 ​ ​ 6.7 ​ Finance leases ​ 1.0 ​ ​ 1.3 ​ Weighted-average discount rate ​ ​ ​ ​ ​ ​ Operating leases ​ 4.6 % ​ 4.7 % Finance leases ​ 3.4 % ​ 3.6 % ​ ​ The Company has the following operating and finance lease commitments as of December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Period Operating Leases (1) Finance Leases Total ​ ​ (in thousands) 2022 ​ $ 19,227 ​ $ 115 ​ $ 19,342 2023 ​ 14,012 ​ 20 ​ 14,032 2024 ​ 12,131 ​ 5 ​ 12,136 2025 ​ 11,010 ​ — ​ 11,010 2026 ​ 9,632 ​ — ​ 9,632 Thereafter ​ 13,936 ​ — ​ 13,936 Total minimum lease payments ​ $ 79,948 ​ $ 140 ​ $ 80,088 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less reconciling items to reconcile undiscounted cash flows to lease liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Short-term leases excluded from balance sheet ​ ​ 2,450 ​ ​ — ​ ​ 2,450 Imputed interest ​ ​ 10,303 ​ ​ 3 ​ ​ 10,306 Total reconciling items ​ ​ 12,753 ​ ​ 3 ​ ​ 12,756 Total liabilities per balance sheet ​ $ 67,195 ​ $ 137 ​ $ 67,332 ​ (1) The table above excludes sublease and lessor income of $1.2 million during 2022, $0.6 million during 2023, $0.3 million during 2024, $0.3 million during 2025 and $0.2 million during 2026.

INVENTORIES

INVENTORIES	12 Months Ended
	Dec. 31, 2021
INVENTORIES
INVENTORIES	NOTE 7—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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, ​ ​ 2021 2020 ​ ​ (in thousands) Raw materials ​ $ 20,396 ​ $ 16,701 Finished goods ​ 24,060 ​ 16,683 Total ​ $ 44,456 ​ $ 33,384 ​ During the years ended December 31, 2021 and 2020, the Company recorded charges to the reserve for excess and obsolete inventory for $0.2 million and $0.9 million, respectively, which were recognized within costs of revenue on the accompanying consolidated statements of operations. The Company’s inventory reserve was $3.9 million as of both December 31, 2021 and 2020. 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	12 Months Ended
	Dec. 31, 2021
PROPERTY AND EQUIPMENT.
PROPERTY AND EQUIPMENT	​ ​ NOTE 8—PROPERTY AND EQUIPMENT Property and equipment consists of the following as of December 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, ​ ​ 2021 2020 ​ ​ (in thousands) Machinery and equipment ​ $ 626,633 ​ $ 596,441 Buildings and leasehold improvements ​ 108,177 ​ 93,236 Pipelines ​ ​ 72,829 ​ ​ 72,458 Disposal wells ​ 63,228 ​ 48,097 Vehicles and equipment ​ 28,502 ​ 30,975 Land ​ ​ 16,873 ​ ​ 13,497 Computer equipment and software ​ ​ 5,395 ​ ​ 7,127 Office furniture and equipment ​ 764 ​ 892 Machinery and equipment - finance lease ​ 544 ​ 537 Vehicles and equipment - finance lease ​ 324 ​ 475 Computer equipment and software - finance lease ​ 412 ​ 356 Construction in progress ​ 19,834 ​ 14,811 ​ ​ 943,515 ​ 878,902 Less accumulated depreciation (1) ​ (551,727) ​ (528,537) Total property and equipment, net ​ $ 391,788 ​ $ 350,365 ​ (1) Includes $1.1 million of accumulated depreciation related to finance leases as of both December 31, 2021 and December 31, 2020. 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 9—Goodwill and Other Intangible Assets” is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Category ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation expense from property and equipment ​ $ 81,381 ​ $ 89,848 ​ $ 107,738 Amortization expense from finance leases ​ ​ 230 ​ ​ 314 ​ ​ 916 Amortization expense from intangible assets ​ ​ 10,639 ​ ​ 11,661 ​ ​ 11,900 Accretion expense from asset retirement obligations ​ ​ 208 ​ ​ (151) ​ ​ 115 Total depreciation and amortization ​ $ 92,458 ​ $ 101,672 ​ $ 120,669 ​ 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 4—Impairments and Other Costs” for impairment and abandonment of property and equipment during the years ended December 31, 2021, 2020 and 2019. ​ During the year ended December 31, 2020, 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) gains 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	12 Months Ended
	Dec. 31, 2021
GOODWILL AND OTHER INTANGIBLE ASSETS.
GOODWILL AND OTHER INTANGIBLE ASSETS	NOTE 9—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 13—Fair Value Measurement”). During the first quarter of 2020, the Company had triggering events related to the 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 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. Given the volatile market environment at March 31, 2020, the Company utilized third-party valuation advisors to assist with these evaluations. These evaluations included significant judgment, including management’s short-term and long-term forecast of operating performance, discount rates based on our weighted-average cost of capital, revenue growth rates, profitability margins, capital expenditures, the timing of future cash flows based on an eventual recovery of the oil and gas industry, and in the case of long-lived assets, the remaining useful life and service potential of the asset. 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. ​ During 2019, the Affirm goodwill was reduced to zero from the crane divestiture and impairment. The $4.4 million of goodwill impairment was based on the expected proceeds from selling and winding down the rest of the Affirm business following the Affirm crane business divestiture. ​ The changes in the carrying amounts of goodwill by reportable segment for the year ended December 31, 2020 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water ​ Water ​ ​ ​ ​ Services Infrastructure Total ​ ​ (in thousands) Balance as of December 31, 2019 ​ $ 186,468 ​ $ 80,466 ​ $ 266,934 Impairment ​ ​ (186,468) ​ ​ (80,466) ​ ​ (266,934) Balance as of December 31, 2020 ​ $ — ​ $ — ​ $ — ​ The components of other intangible assets as of December 31, 2021 and 2020 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2021 ​ As of December 31, 2020 ​ Gross Accumulated Net Gross ​ ​ Accumulated Net ​ ​ Value ​ Amortization ​ Value ​ Value ​ Impairment ​ Amortization ​ Value ​ ​ (in thousands) ​ (in thousands) Definite-lived ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships ​ $ 116,554 ​ $ (38,371) ​ $ 78,183 ​ $ 116,554 ​ $ — ​ $ (29,302) ​ $ 87,252 Patents and other intellectual property ​ ​ 12,772 ​ ​ (4,313) ​ ​ 8,459 ​ ​ 9,741 ​ ​ — ​ ​ (3,166) ​ ​ 6,575 Other ​ ​ 7,234 ​ ​ (6,795) ​ ​ 439 ​ 7,234 ​ ​ — ​ (6,373) ​ 861 Total definite-lived ​ ​ 136,560 ​ ​ (49,479) ​ ​ 87,081 ​ ​ 133,529 ​ ​ — ​ ​ (38,841) ​ ​ 94,688 Indefinite-lived ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water rights ​ ​ 7,031 ​ ​ — ​ ​ 7,031 ​ ​ 7,031 ​ ​ — ​ ​ — ​ ​ 7,031 Trademarks ​ ​ 14,360 ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ (9,082) ​ ​ — ​ ​ 14,360 Total indefinite-lived ​ ​ 21,391 ​ ​ — ​ ​ 21,391 ​ ​ 30,473 ​ ​ (9,082) ​ ​ — ​ ​ 21,391 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total other intangible assets, net ​ $ 157,951 ​ $ (49,479) ​ $ 108,472 ​ $ 164,002 ​ $ (9,082) ​ $ (38,841) ​ $ 116,079 ​ Due to the triggering events discussed above, the Company also tested all intangible assets for impairment during the first quarter of 2020. These evaluations included significant judgment, including discount rates based on our weighted-average cost of capital and the royalty rate. This resulted in $9.1 million of impairment to trademarks using the relief-from-royalty method, which was recorded in the Oilfield Chemicals segment. During the year ended December 31, 2021, the Company added $3.0 million in patents and other intellectual property in connection with the UltRecovery acquisition (See “Note 3—Acquisitions and Divestitures”). During the year ended December 31, 2020, the Company added no new intangible assets. The weighted-average amortization period for customer relationships, patents and other intellectual property and other definite-lived intangible assets as of December 31, 2021 was 8.7 years, 6.4 years and 2.3 years, respectively. The indefinite-lived water trademarks five Amortization expense of $10.6 million, $11.7 million and $11.9 million was recorded for the years ended December 31, 2021, 2020 and 2019, respectively. Annual amortization of intangible assets for the next five years and beyond is as follows: ​ ​ ​ ​ ​ Year Ending December 31, Amount ​ ​ (in thousands) 2022 ​ $ 10,666 2023 ​ 10,594 2024 ​ 10,525 2025 ​ 10,362 2026 ​ 10,274 Thereafter ​ ​ 34,660 Total ​ $ 87,081 ​

DEBT

DEBT	12 Months Ended
	Dec. 31, 2021
DEBT
DEBT	NOTE 10—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. 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 ​ < 33.33% 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 14—Related Party Transactions—Tax Receivable Agreements” 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 December 31, 2021 and 2020. As of December 31, 2021 and 2020, the borrowing base under the Credit Agreement was $132.7 million and $96.4 million, respectively. The borrowing capacity under the Credit Agreement was reduced by outstanding letters of credit of $15.6 million as of both December 31, 2021 and 2020. The Company’s letters of credit have a variable interest rate between 1.50% and 2.00% based on the Company’s average excess availability as outlined above. The unused portion of the available borrowings under the Credit Agreement was $117.1 million as of December 31, 2021. 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 December 31, 2021 and 2020 were $0.6 million and $1.3 million, respectively. As the debt issuance costs relate to a revolving line of credit, they are presented as a deferred charge within other long-term assets on the consolidated balance sheet. Amortization expense related to debt issuance costs were $0.7 million, $0.7 million and $0.7 million for the years ended December 31, 2021, 2020 and 2019, respectively. The Company was in compliance with all debt covenants as of and throughout the year ended December 31, 2021.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2021
COMMITMENTS AND CONTINGENCIES
COMMITMENTS AND CONTINGENCIES	NOTE 11—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. ​ On April 20, 2021, an entity acquired in the 2017 merger (the “Rockwater Merger”) with Rockwater Energy Solutions, Inc. (“Rockwater”) formally pled guilty to violations of the Clean Air Act that occurred prior to the Rockwater Merger and entered a plea agreement before the U.S. District Court for the Middle District of Pennsylvania. Entry into this plea agreement has resolved the government’s prosecution related to Rockwater’s altering emissions controls systems on less than 5% of the vehicles in its fleet. The Company made final payments in April 2021 totaling $2.6 million, which was the amount accrued as of both March 31, 2021 and December 31, 2020, and did not incur additional monetary penalties or fines. The total amount paid in settlement of this matter was $4.3 million. ​ Retentions We are self-insured up to certain retention limits with respect to workers’ compensation, general liability and vehicle liability matters, and 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	12 Months Ended
	Dec. 31, 2021
EQUITY-BASED COMPENSATION
EQUITY-BASED COMPENSATION	NOTE 12—EQUITY-BASED COMPENSATION The SES Holdings 2011 Equity Incentive Plan (the “2011 Plan”) was approved by the board of managers of SES Holdings in April 2011. In conjunction with the private placement of 16,100,000 shares of the Company’s Class A Common Stock on December 20, 2016 (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 May 8, 2020, the Company’s stockholders approved an amendment to the 2016 Plan to increase 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 and to make certain other administrative changes. The 2016 Plan includes share recycling provisions that allow shares subject to an award that are withheld or surrendered to the Company in payment of any exercise price or taxes or an award that expires or is cancelled, forfeited or otherwise terminated without actual delivery of the underlying shares of Class A Common Stock to be considered not delivered and thus available to be granted as new awards under the 2016 Plan. Currently, the maximum number of shares reserved for issuance under the 2016 Plan is approximately 13.3 million shares, with approximately 2.8 million shares available to be issued as of December 31, 2021. For all share-based compensation award types, the Company accounts for forfeitures as they occur. Stock Option Awards The Company has outstanding stock option awards as of December 31, 2021 but there have been no option grants since 2018. The 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. The Company utilized the Monte Carlo option pricing model to determine fair value of the options granted during 2018, which incorporated 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 is based on the vesting period and term of the options awarded, which is ten years. A summary of the Company’s stock option activity and related information as of and for the year ended December 31, 2021 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average ​ ​ ​ ​ ​ ​ ​ Weighted-average ​ Weighted-average ​ Grant Date Value ​ Aggregate Intrinsic ​ Stock Options Grant Date Value ​ Exercise Price Term (Years) Value (in thousands) (a) Beginning balance, outstanding 3,519,159 ​ $ 8.58 ​ $ 16.11 ​ 3.3 ​ $ — Expired ​ (1,444,943) ​ ​ 6.80 ​ ​ 15.00 ​ ​ ​ ​ ​ Ending balance, outstanding 2,074,216 ​ $ 9.82 ​ $ 16.89 ​ 4.4 ​ $ — Ending balance, exercisable ​ 2,074,216 ​ $ 9.82 ​ $ 16.89 ​ 4.4 ​ $ — Nonvested as of December 31, 2021 ​ — ​ ​ N/A ​ $ — ​ ​ ​ ​ ​ (a) Aggregate intrinsic value for stock options is based on the difference between the exercise price of the stock options and the quoted closing Class A Common Stock price of $6.23 and $4.10 as of December 31, 2021 and 2020, respectively. The Company recognized a nominal amount of compensation expense, $0.2 million and $4.3 million of compensation expense related to stock options during the years ended December 31, 2021, 2020 and 2019, respectively. As of December 31, 2021, all equity-based compensation expense related to stock options had been recognized. Restricted Stock Awards and Restricted Stock Units The value of the restricted stock awards and restricted stock units granted 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 year ended December 31, 2021 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2021 ​ ​ ​ ​ Weighted-average ​ Restricted Stock Awards Grant Date Fair Value Nonvested as of December 31, 2020 ​ 2,003,072 ​ $ 6.97 Granted ​ 2,154,897 ​ ​ 6.29 Vested ​ (693,582) ​ ​ 7.92 Forfeited ​ (319,874) ​ ​ 6.41 Nonvested as of December 31, 2021 ​ 3,144,513 ​ $ 6.35 ​ A summary of the Company’s restricted stock unit activity and related information for the year ended December 31, 2020 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2020 ​ ​ ​ ​ Weighted-average ​ Restricted Stock Units Grant Date Fair Value Nonvested as of December 31, 2019 1,250 ​ $ 19.00 Vested (625) ​ ​ 20.00 Forfeited (625) ​ ​ 18.00 Nonvested as of December 31, 2020 — ​ $ — ​ Performance Share Units During 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, 2019 through December 31, 2021 performance period. ​ The target number of shares of Class A Common Stock subject to each PSU granted in 2019 is ​ ​ ​ ​ 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% ​ Also, during 2020, the Company revised the estimates for the PSUs granted in 2019, which are not expected to achieve the performance-based vesting conditions. During 2020 and 2021, 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 applicable period from either January 1, 2020 through December 31, 2022 or January 1, 2021 through December 31, 2023. During the year ended December 31, 2021, the Company also approved grants of PSUs subject to both performance-based and service-based vesting conditions based on adjusted earnings before taxes and depreciation (“Adjusted EBITDA”) (as defined in the applicable PSU agreement). The target number of shares of Class A Common Stock subject to each PSU granted in 2020 and 2021 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 and June 30, 2024 for the 2021 PSU grants, assuming the minimum performance metrics are achieved. The target PSUs granted in 2020 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 ​ ​ ​ ​ 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 target PSUs granted in 2021 connected with Adjusted EBITDA can only vest at 100% if the minimum Adjusted EBITDA threshold is met. Failure to meet this threshold would result in 0% vesting which is what is reflected in the accompanying consolidated financial statements. The fair value on the date the PSUs were granted during 2021, 2020 and 2019 was $4.4 million, $4.4 million and $7.0 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 year ended December 31, 2020, the Company revised the estimates for the PSUs granted in 2019 and expect 0% to vest. The Company recognized compensation expense of $1.6 million, a reduction to compensation expense of $1.7 million and compensation expense of $2.1 million related to the PSUs for the years ended December 31, 2021, 2020 and 2019, respectively. As of December 31, 2021, the unrecognized compensation cost related to our unvested PSUs is estimated to be $3.2 million and is expected to be recognized over a weighted-average period of 1.7 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 December 31, 2021: ​ ​ ​ ​ ​ Performance Share Units Nonvested as of December 31, 2020 ​ 1,763,909 Target shares granted ​ 689,551 Target shares forfeited ​ (247,856) Target shares outstanding as of December 31, 2021 ​ 2,205,604 ​ Employee Stock Purchase Plan (ESPP) The Company has an Employee Stock Purchase Plan (the “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 ESPP provides for four The following table summarizes ESPP activity (in thousands, except shares): ​ ​ ​ ​ ​ ​ For the year ended ​ December 31, 2021 Cash received for shares issued ​ $ 58 Shares issued ​ ​ 10,518 ​ Share-repurchases During the years ended December 31, 2021 and 2020, the Company repurchased zero and 1,989,440 shares, respectively, of Class A Common Stock in the open market and repurchased 199,974 and 210,384 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 year ended December 31, 2021, the repurchases were accounted for as a decrease to paid in-capital of $1.2 million and a decrease to Class A common stock of approximately $2,000 .

FAIR VALUE MEASUREMENT

FAIR VALUE MEASUREMENT	12 Months Ended
	Dec. 31, 2021
FAIR VALUE MEASUREMENT
FAIR VALUE MEASUREMENT	NOTE 13—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 or to measure the value of securities marked to market. 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 ASC 820 establishes a three-level valuation hierarchy for the 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 years ended December 31, 2021, 2020 and 2019. Assets and liabilities measured at fair value on a recurring and non-recurring basis Nonfinancial assets and liabilities measured at fair value on a non-recurring basis include certain nonfinancial assets and liabilities as may be acquired in a business combination and measurements of goodwill and intangible impairment. As there is no corroborating market activity to support the assumptions used, the Company has designated these measurements as Level 3. Long-lived assets, such as property and equipment and finite-lived intangible assets, are evaluated for impairment whenever events or changes in circumstances indicate that its carrying value may not be recoverable. The development of future cash flows and the estimate of fair value represent the Company’s best estimates based on industry trends and reference to market transactions and are subject to variability. The Company’s estimates of fair value have been determined at discrete points in time based on relevant information. These estimates involve uncertainty and cannot be determined with precision. There were no significant changes in valuation techniques or related inputs for the years ended December 31, 2021, 2020 and 2019. The following table presents information about the Company’s assets measured at fair value on a recurring and non-recurring basis for the years ended December 31, 2021, 2020 and 2019. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measurements Using ​ Carrying ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 ​ Level 2 ​ Level 3 ​ Value (1) ​ Impairment ​ ​ ​ ​ ​ ​ (in thousands) Year Ended December 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investments ​ Recurring ​ March 31 ​ $ 1,546 ​ $ — ​ $ — ​ $ 1,546 ​ $ — Investments ​ Recurring ​ June 30 ​ ​ 2,208 ​ ​ — ​ ​ — ​ ​ 2,208 ​ ​ — Investments ​ Recurring ​ September 30 ​ ​ 1,717 ​ ​ — ​ ​ — ​ ​ 1,717 ​ ​ — Investments ​ Recurring ​ December 31 ​ ​ 75 ​ ​ — ​ ​ — ​ ​ 75 ​ ​ — Year Ended December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Goodwill ​ Non-recurring ​ March 31 ​ $ — ​ $ — ​ $ — ​ $ 266,934 ​ $ 266,934 Trademark ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ 9,082 Property and equipment ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 176 ​ ​ 3,360 ​ ​ 3,184 Property and equipment ​ Non-recurring ​ June 30 ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,726 ​ ​ 4,726 Investments ​ Recurring ​ September 30 ​ ​ — ​ ​ 1,768 ​ ​ — ​ ​ 1,768 ​ ​ — Investments ​ Recurring ​ December 31 ​ ​ 3,377 ​ ​ — ​ ​ — ​ ​ 3,377 ​ ​ — Year Ended December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Goodwill ​ Non-recurring ​ March 31 ​ $ — ​ $ — ​ $ — ​ $ 4,396 ​ $ 4,396 Property and equipment ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 2,346 ​ ​ 2,865 ​ ​ 519 Property and equipment ​ Non-recurring ​ June 30 ​ ​ — ​ ​ — ​ ​ 2,386 ​ ​ 2,760 ​ ​ 374 Property and equipment ​ Non-recurring ​ September 30 ​ ​ — ​ ​ — ​ ​ 38 ​ ​ 87 ​ ​ 49 Property and equipment ​ Non-recurring ​ December 31 ​ ​ — ​ ​ — ​ ​ 2,555 ​ ​ 5,328 ​ ​ 2,773 ​ (1) Amount represents carrying value at the date of assessment. ​ Other fair value considerations See “Note 4—Impairments and Other Costs” for a discussion of impairment reflected above incurred during the years ended December 31, 2021, 2020 and 2019, respectively. Also, see “Note 3—Acquisitions and Divestitures” for a discussion of the fair value incorporated into the purchase price allocation for acquisitions occurring during the years ended December 31, 2021 and 2019. 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 December 31, 2021 and 2020 due to the short-term nature of these instruments. The Company did not have any bank debt as of December 31, 2021 or 2020. 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. ​ Nonmonetary transaction warrants and other securities derived from quoted active market pricing of unrestricted, publicly-traded, common stock, warrants and other securities. ​ The Company sold most of these securities during 2021 for $2.3 million, and recorded a $1.0 million realized gain during the year ended December 31, 2021 recognized within other income (expense), net on the accompanying consolidated statements of operations. The Company recorded a $2.0 million unrealized loss and $1.8 million unrealized gain on the securities during the years ended December 31, 2021 and 2020, respectively, based on the value of the securities as of the end of each reporting period within those respective years, recognized within other income (expense), net on the accompanying consolidated statements of operations. The $0.1 million of remaining securities was included in prepaid expenses and other current assets on the accompanying consolidated balance sheets as of December 31, 2021.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2021
RELATED PARTY TRANSACTIONS
RELATED PARTY TRANSACTIONS	NOTE 14—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, an investment in a company that is significantly influenced by another related party, and cost-method and equity-method investees. 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. ​ During the year ended December 31, 2021, sales to related parties were $1.1 million and purchases from related-party vendors were $7.0 million. These purchases consisted of $5.8 million relating to the rental of certain equipment or other services used in operations, $1.0 million relating to management, consulting and other services and $0.2 million related to purchases of property and equipment. During the year ended December 31, 2020, sales to related parties were $3.9 million and purchases from related-party vendors were $7.3 million. These purchases consisted of $6.3 million relating to the rental of certain equipment or other services used in operations, $0.5 million relating to purchases of property and equipment, $0.4 million relating to management, consulting and other services and $0.1 million relating to inventory and consumables. Additionally, during the years ended December 31, 2021 and 2020, the Company invested $1.1 million and $3.0 million, respectively, in a note receivable with an affiliate through common ownership for which the balance is included in other long-term assets, net on the consolidated balance sheets. During the year ended December 31, 2019, sales to related parties were $16.8 million and purchases from related-party vendors were $18.8 million. These purchases consisted of $14.3 million relating to the rental of certain equipment or other services used in operations, $3.0 million relating to purchases of property and equipment, $1.3 million relating to management, consulting and other services and $0.2 million relating to inventory and consumables. 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 Legacy Owner Holdco 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. The Company has not recognized a liability associated with the Tax Receivable Agreements as of December 31, 2021, or 2020.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2021
INCOME TAXES
INCOME TAXES	NOTE 15—INCOME TAXES Select Inc. is subject to U.S. federal and state income taxes as a corporation. SES Holdings and its subsidiaries, with the exception of certain corporate subsidiaries, are treated as flow-through entities for U.S. federal income tax purposes and as such, are generally not subject to U.S. federal income tax at the entity level. Rather, the tax liability with respect to their taxable income is passed through to their members or partners. Select Inc. recognizes a tax liability on its allocable share of SES Holdings’ taxable income. The Company’s effective tax rates for the years ended December 31, 2021, 2020 and 2019 were 0.3%, 0.4% and 32.0% respectively. The effective tax rates for the years ended December 31, 2021, 2020 and 2019 differ from the statutory rate of 21% for 2021, 2020 and 2019 due to net income allocated to noncontrolling interests, state income taxes and valuation allowances. The components of the federal and state income tax (benefit) expense are summarized as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended ​ ​ December 31, ​ 2021 2020 2019 ​ ​ (in thousands) Current tax (benefit) expense ​ ​ ​ Federal income tax expense (benefit) ​ $ 126 ​ $ (941) ​ $ 696 State and local income tax (benefit) expense ​ (262) ​ (439) ​ 1,034 Total current (benefit) expense ​ (136) ​ (1,380) ​ 1,730 Deferred tax expense (benefit) ​ ​ ​ Federal income tax expense (benefit) ​ 56 ​ (105) ​ 49 State and local income tax expense (benefit) ​ 227 ​ 9 ​ 170 Total deferred expense (benefit) ​ 283 ​ (96) ​ 219 Total income tax expense (benefit) ​ $ 147 ​ $ (1,476) ​ $ 1,949 Tax expense (benefit) attributable to controlling interests ​ $ 124 ​ $ (1,246) ​ $ 1,488 Tax expense (benefit) attributable to noncontrolling interests ​ 23 ​ (230) ​ 461 Total income tax expense (benefit) ​ $ 147 ​ $ (1,476) ​ $ 1,949 ​ A reconciliation of the Company’s provision for income taxes as reported and the amount computed by multiplying income before taxes, less noncontrolling interest, by the U.S. federal statutory rate of 21% for 2021, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ ​ ​ 2021 ​ 2020 ​ 2019 ​ ​ ​ (in thousands) ​ Provision calculated at federal statutory income tax rate: ​ ​ ​ ​ ​ ​ ​ ​ (Loss) income before equity in losses of unconsolidated entities and taxes ​ $ (49,659) ​ ​ $ (403,208) ​ ​ $ 6,085 ​ Equity in losses of unconsolidated entities ​ ​ (279) ​ ​ ​ — ​ ​ ​ — ​ (Loss) income before taxes ​ ​ (49,938) ​ ​ ​ (403,208) ​ ​ ​ 6,085 ​ Statutory rate ​ 21 % ​ 21 % ​ 21 % Income tax (benefit) expense computed at statutory rate ​ (10,487) ​ ​ (84,674) ​ ​ 1,278 ​ Less: noncontrolling interests ​ 1,651 ​ ​ 13,272 ​ ​ (284) ​ Income tax (benefit) expense attributable to controlling interests ​ (8,836) ​ ​ (71,402) ​ ​ 994 ​ State and local income taxes, net of federal benefit ​ (30) ​ ​ (430) ​ ​ 884 ​ State rate change ​ (2,787) ​ ​ 179 ​ ​ 1,359 ​ Change in subsidiary tax status ​ ​ 679 ​ ​ ​ (409) ​ ​ ​ 587 ​ Deferred tax adjustments ​ ​ 4,804 ​ ​ ​ — ​ ​ ​ — ​ CARES Act NOL carryback benefit ​ ​ — ​ ​ ​ (459) ​ ​ ​ — ​ Change in valuation allowance ​ 6,119 ​ ​ 71,275 ​ ​ (3,192) ​ Deferred adjustment due to restructuring ​ ​ — ​ ​ ​ — ​ ​ ​ 856 ​ Other ​ ​ 175 ​ ​ ​ — ​ ​ ​ — ​ Income tax expense (benefit) attributable to controlling interests ​ 124 ​ ​ (1,246) ​ ​ 1,488 ​ Income tax expense (benefit) attributable to noncontrolling interests ​ 23 ​ ​ (230) ​ ​ 461 ​ Total income tax expense (benefit) ​ $ 147 ​ ​ $ (1,476) ​ ​ $ 1,949 ​ ​ Deferred taxes result from the temporary differences between financial reporting carrying amounts and the tax basis of existing assets and liabilities. As of December 31, 2021, and 2020, the Company had net deferred tax liabilities of $0.5 million and $0.2 million, respectively, which are recorded in other long-term liabilities on the consolidated balance sheets. The principal components of the deferred tax assets (liabilities) are summarized as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended ​ ​ December 31, ​ 2021 2020 ​ ​ (in thousands) Deferred tax assets ​ ​ Outside basis difference in SES Holdings ​ $ 62,110 ​ $ 78,918 Net operating losses ​ 92,366 ​ 69,601 Credits and other carryforwards ​ 4,316 ​ 4,111 Other ​ ​ 43 ​ ​ 541 Total deferred tax assets before valuation allowance ​ 158,835 ​ 153,171 Valuation allowance ​ ​ (158,779) ​ ​ (152,659) Total deferred tax assets ​ ​ 56 ​ ​ 512 Deferred tax liabilities ​ ​ Property and equipment ​ 530 ​ 718 Other ​ 56 ​ 41 Total deferred tax liabilities ​ 586 ​ 759 Net deferred tax liabilities ​ $ (530) ​ $ (247) ​ For the year ended December 31, 2021, the Company recorded an increase in valuation allowance of $6.1 million against certain deferred tax assets. The Company has assessed the future potential to realize these deferred tax assets and has concluded it is more likely than not that these deferred tax assets will not be realized based on current economic conditions and expectations of the future. Furthermore, the Company has not recorded a liability for the effect of any associated Tax Receivable Agreement liabilities as the liability is based on the actual cash tax savings expected to be realized by the Company, which are not considered probable as of December 31, 2021 or 2020. The Company considers all available evidence (both positive and negative), including continuing periods of income and other tax planning strategies, in determining whether realization of the tax benefit is more likely than not. The Company will continue to monitor facts and circumstances in the reassessment of the likelihood that the tax benefit will be realized. If this were to occur, the valuation allowance, or a portion thereof, would be released. Similarly, the Company considers all available evidence (both positive and negative) in order to determine the probability of a payment under the Tax Receivable Agreements in its assessment of establishing a liability. If determined to be probable, there would be a corresponding charge to Tax Receivable Agreement expense. See “Note 14—Related Party Transactions” for further discussion of the Tax Receivable Agreements. 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 2020, as a result of the net operating loss carryback and interest expense limitation provisions of the CARES Act. As of December 31, 2021, the Company and certain corporate subsidiaries of SES Holdings had approximately $382.4 million of U.S. federal net operating loss carryforwards (“NOLs”), of which $133.8 million will begin to expire in 2031 and $248.6 million have no expiration, tax benefits from state NOLs of approximately $10.2 million that will begin to expire in 2023, and approximately $6.8 million of foreign NOLs, which will begin to expire in 2037. Accounting for uncertainty in income taxes prescribes a recognition threshold and measurement methodology for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. As of December 31, 2021 and 2020 there was no liability or expense for the periods then ended recorded for payments of interest and penalties associated with uncertain tax positions or material unrecognized tax positions. Separate federal and state income tax returns are filed for Select Inc., SES Holdings and certain consolidated affiliates. The tax years 2017 through 2020 remain open to examination by the major taxing jurisdictions to which the Company is subject to income tax. The Louisiana Department of Revenue completed its audits of the corporate income and franchise tax returns of Select Inc. and Select Western, a corporate subsidiary of SES Holdings, for the years ended 2016 through 2018. The audits did not result in a material assessment.

NONCONTROLLING INTERESTS

NONCONTROLLING INTERESTS	12 Months Ended
	Dec. 31, 2021
NONCONTROLLING INTERESTS
NONCONTROLLING INTERESTS	NOTE 16—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 ​ ​ ​ December 31, 2021 December 31, 2020 ​ ​ ​ ​ (in thousands) ​ Noncontrolling interests attributable to joint ventures formed for water-related services ​ ​ $ 1,091 $ 2,002 ​ Noncontrolling interests attributable to holders of Class B Common Stock ​ ​ ​ 101,987 110,819 ​ Total noncontrolling interests ​ ​ $ 103,078 $ 112,821 ​ ​ During the years ended December 31, 2021 and 2020, the Company had divestitures of joint ventures that eliminated $0.9 million and $0.2 million of noncontrolling interest in 2021 and 2020, respectively. For all periods presented, there were no other changes to Select’s ownership interest in joint ventures formed for water-related services. However, during the years ended December 31, 2021, 2020 and 2019, 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 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ 2021 2020 2019 ​ ​ (in thousands) Net (loss) income attributable to Select Energy Services, Inc. ​ $ (42,225) $ (338,684) $ 2,784 Transfers from (to) noncontrolling interests: ​ ​ ​ ​ ​ Increase in additional paid-in capital as a result of issuing shares for business combinations ​ ​ 532 ​ ​ — ​ ​ — Increase in additional paid-in capital as a result of stock option exercises ​ — — 54 Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures ​ 1,847 1,874 3,614 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 ​ (19) (1,416) (3,362) Increase in additional paid-in capital as a result of exchanges of SES Holdings LLC Units (an equivalent number of shares of Class B Common Stock) for shares of Class A Common Stock ​ ​ — ​ ​ — ​ ​ 107,062 Increase in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued ​ ​ 1 ​ ​ 7 ​ ​ 42 Change to equity from net (loss) income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests ​ $ (39,864) $ (338,218) $ 110,198 ​

(LOSS) EARNINGS PER SHARE

(LOSS) EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2021
(LOSS) EARNINGS PER SHARE
(LOSS) EARNINGS PER SHARE	​ ​ NOTE 17— (LOSS) EARNINGS PER SHARE (Loss) earnings per share are based on the amount of (loss) income allocated to the shareholders and the weighted-average number of shares outstanding during the period for each class of common stock. Outstanding options to purchase 2,074,216 and 3,519,159 shares are not included in the calculation of diluted weighted-average shares outstanding for the year ended December 31, 2021 and 2020 respectively, as the effect is antidilutive. The following tables present the Company’s calculation of basic and diluted earnings per share for the years ended December 31, 2021, 2020 and 2019 (dollars in thousands, except share and per share amounts): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2021 ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Services, Inc. Class A Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss ​ $ (50,085) ​ ​ ​ ​ ​ ​ Net loss attributable to noncontrolling interests ​ ​ 7,860 ​ ​ ​ ​ ​ ​ Net loss attributable to Select Energy Services, Inc. — basic ​ $ (42,225) ​ $ (42,225) ​ $ — Net loss attributable to Select Energy Services, Inc. — diluted ​ $ (42,225) ​ $ (42,225) ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 87,275,467 ​ ​ 16,221,101 Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 87,275,467 ​ ​ 16,221,101 Loss per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ (0.48) ​ $ — Diluted ​ ​ ​ ​ $ (0.48) ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2020 ​ ​ Select Energy Services, Inc. ​ Class A ​ Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss attributable to Select Energy Services, Inc. — diluted ​ $ (401,732) ​ ​ ​ ​ ​ ​ Net loss attributable to noncontrolling interests ​ ​ 63,048 ​ ​ ​ ​ ​ ​ Net loss attributable to Select Energy Services, Inc. — basic ​ $ (338,684) ​ $ (338,684) ​ $ — Net loss attributable to Select Energy Services, Inc. — diluted ​ $ (338,684) ​ $ (338,684) ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 85,158,764 ​ ​ 16,221,101 Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 85,158,764 ​ ​ 16,221,101 Loss per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ (3.98) ​ $ — Diluted ​ ​ ​ ​ $ (3.98) ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2019 ​ ​ Select Energy Services, Inc. ​ Class A ​ Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 4,136 ​ ​ ​ ​ ​ ​ Net income attributable to noncontrolling interests ​ ​ (1,352) ​ ​ ​ ​ ​ ​ Net income attributable to Select Energy Services, Inc. — basic ​ $ 2,784 ​ $ 2,784 ​ $ — Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of restricted stock ​ ​ 7 ​ ​ 7 ​ ​ — Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of performance share units ​ ​ 2 ​ ​ 2 ​ ​ — Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of stock options ​ ​ 1 ​ ​ 1 ​ ​ — Net income attributable to Select Energy Services, Inc. — diluted ​ $ 2,794 ​ $ 2,794 ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 80,176,323 ​ ​ 23,806,646 Dilutive effect of restricted stock ​ ​ ​ ​ ​ 373,366 ​ ​ — Dilutive effect of stock options ​ ​ ​ ​ ​ 80,979 ​ ​ — Dilutive effect of stock options ​ ​ ​ ​ ​ 40,215 ​ ​ — Dilutive effect of ESPP ​ ​ ​ ​ ​ 446 ​ ​ — Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 80,671,329 ​ ​ 23,806,646 Earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ 0.03 ​ $ — Diluted ​ ​ ​ ​ $ 0.03 ​ $ — ​

SEGMENT INFORMATION

SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2021
SEGMENT INFORMATION
SEGMENT INFORMATION	NOTE 18—SEGMENT INFORMATION Select Inc. is a leading provider of comprehensive water-management and chemical 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. The Company’s CODM assesses performance and allocates resources on the basis of the following Water Services Water Infrastructure ​ Oilfield Chemicals ​ Financial information by segment for the years ended December 31, 2021, 2020 and 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2021 ​ ​ ​ Loss Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 399,709 ​ $ (26,219) ​ $ 53,777 ​ $ 18,296 Water Infrastructure ​ ​ 155,323 ​ ​ 2,689 ​ ​ 26,957 ​ ​ 22,043 Oilfield Chemicals ​ ​ 216,410 ​ ​ 1,984 ​ ​ 9,294 ​ ​ 5,010 Other ​ ​ — ​ ​ (19) ​ ​ — ​ ​ 1,032 Eliminations ​ (6,822) ​ — ​ — ​ — Loss from operations ​ ​ ​ (21,565) ​ ​ ​ ​ Corporate ​ — ​ (43,975) ​ 2,430 ​ — Interest expense, net ​ — ​ (1,711) ​ — ​ — Bargain purchase gain ​ ​ — ​ ​ 18,985 ​ ​ — ​ ​ — Other expense, net ​ — ​ (1,393) ​ — ​ — ​ ​ $ 764,620 ​ $ (49,659) ​ $ 92,458 ​ $ 46,381 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2020 ​ ​ ​ Loss Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 322,461 ​ $ (250,779) ​ $ 61,758 ​ $ 2,161 Water Infrastructure ​ ​ 125,710 ​ ​ (96,290) ​ ​ 27,599 ​ ​ 6,852 Oilfield Chemicals ​ ​ 160,825 ​ ​ (13,365) ​ ​ 9,443 ​ ​ 7,157 Other ​ ​ — ​ ​ (733) ​ ​ — ​ ​ 330 Eliminations ​ (3,891) ​ — ​ — ​ — Loss from operations ​ ​ ​ (361,167) ​ ​ ​ ​ Corporate ​ — ​ (33,610) ​ 2,872 ​ — Interest expense, net ​ — ​ (2,136) ​ — ​ — Other expense, net ​ — ​ (6,295) ​ — ​ — ​ ​ $ 605,105 ​ $ (403,208) ​ $ 101,672 ​ $ 16,500 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2019 ​ ​ ​ Income (loss) Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 773,946 ​ $ 51,185 ​ $ 80,664 ​ $ 37,692 Water Infrastructure ​ ​ 221,661 ​ ​ 15,103 ​ ​ 25,665 ​ ​ 53,839 Oilfield Chemicals ​ ​ 268,963 ​ ​ 17,942 ​ ​ 8,766 ​ ​ 11,110 Other ​ ​ 33,365 ​ ​ (8,066) ​ ​ 1,714 ​ ​ 64 Eliminations ​ (6,346) ​ — ​ — ​ — Income from operations ​ ​ ​ 76,164 ​ ​ ​ ​ Corporate ​ — ​ (53,090) ​ 3,860 ​ — Interest expense, net ​ — ​ (2,688) ​ — ​ — Other expense, net ​ — ​ (14,301) ​ — ​ — ​ ​ $ 1,291,589 ​ $ 6,085 ​ $ 120,669 ​ $ 102,705 ​ Total assets by segment as of December 31, 2021 and 2020 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ December 31, 2021 December 31, 2020 ​ ​ (in thousands) Water Services ​ $ 533,071 ​ $ 515,856 Water Infrastructure ​ 229,803 ​ 204,995 Oilfield Chemicals ​ 180,732 ​ 147,612 Other ​ ​ 6,586 ​ ​ 6,896 ​ ​ $ 950,192 ​ $ 875,359 ​ ​ Revenue by groups of similar products and services is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ 2021 2020 ​ 2019 ​ ​ (in thousands) Oilfield chemicals ​ $ 216,410 ​ $ 160,825 ​ $ 268,963 Water transfer ​ ​ 175,153 ​ ​ 146,728 ​ ​ 355,535 Pipeline logistics and disposal ​ ​ 108,629 ​ ​ 91,971 ​ ​ 101,145 Accommodations and rentals ​ 64,467 ​ ​ 56,973 ​ ​ 139,950 Flowback and well testing ​ ​ 75,610 ​ ​ 61,839 ​ ​ 208,572 Fluid hauling ​ ​ 85,355 ​ ​ 58,368 ​ ​ 73,999 Water sourcing ​ 46,695 ​ 33,739 ​ ​ 120,517 Eliminations and other service lines ​ (7,699) ​ (5,338) ​ ​ 22,908 ​ ​ $ 764,620 ​ $ 605,105 ​ $ 1,291,589 ​ In connection with the Rockwater Merger in November 2017, the Company expanded into Canada and during 2019, the Company divested and wound down Canadian operations. The Company attributed revenue to the U.S. and Canada based on the location where services were performed or the destination of the products or equipment sold or rented. Long-lived assets consisted of property and equipment and are attributed to the U.S. and Canada based on the physical location of the asset at the end of the period. The Company’s revenue attributed to the U.S. was $764.6 million or 100.0%, $605.1 million or 100.0% and $1,283.4 million or 99.4% of total revenue during the years ended December 31, 2021, 2020 and 2019, respectively. The Company’s revenue attributed to Canada was zero during the years ended December 31, 2021 and 2020 and $8.2 million or 0.6% during the year ended December 31, 2019. The Company’s net long-lived assets attributed to the U.S. were $391.8 million or 100.0%, $350.4 million or 100.0% and $452.4 million or 99.8% of total net long-lived assets as of December 31, 2021, December 31, 2020 and December 31, 2019, respectively. The Company’s net long-lived assets attributed to Canada were zero as of December 31, 2021 and 2020 and $0.9 million or 0.2% of total net long-lived assets as of December 31, 2019.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Dec. 31, 2021
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	NOTE 19—SUBSEQUENT EVENTS On February 23, 2022, the Company closed on the announced acquisition of Nuverra Environmental Solutions, Inc. ("Nuverra") in an all-stock transaction. In consideration, the Company issued approximately 4.15 million shares of Class A Common Stock to Nuverra shareholders. In connection with the acquisition, the Company is expected to pay off approximately $19 million of Nuverra debt with cash on hand. ​ ​

SIGNIFICANT ACCOUNTING POLICI_2

SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2021
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 reserve, income taxes, self-insurance liabilities, share-based compensation, contingent liabilities, lease-related reasonably certain option exercise assessments, 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.
Cash and cash equivalents	Cash and cash equivalents : The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents.
Accounts receivable and allowance for credit losses	Accounts receivable : Accounts receivable are stated at the invoiced amount, or the earned but not yet invoiced amount, net of an allowance for credit losses. Allowance for credit losses: ​ The change in the allowance for credit losses is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Balance at beginning of year ​ $ 9,157 $ 5,773 $ 5,329 Increase to allowance based on a percentage of revenue ​ 1,477 1,212 2,641 Adjustment based on aged receivable analysis ​ ​ (1,444) ​ ​ 5,161 ​ ​ (88) Charge-offs ​ (4,793) (3,003) (2,504) Recoveries ​ ​ 4 14 395 Balance at end of year ​ $ 4,401 $ 9,157 $ 5,773 ​ The Company also has a $4.4 million note receivable resulting from an initial investment in 2020 and additional investment in 2021, with no allowance for credit losses as of December 31, 2021. See “Note 14 – Related Party Transactions” for additional information.
Concentrations of credit and customer risk	Concentrations of credit and customer risk : Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and trade accounts receivable. The amounts held in financial institutions periodically exceed the federally insured limit. Management believes that the financial institutions are financially sound and the risk of loss is minimal. The Company minimizes its exposure to counterparty credit risk by performing credit evaluations and ongoing monitoring of the financial stability of its customers. There were
Inventories	Inventories : The Company values its inventories at lower of cost or net realizable value. Inventory costs are determined under the weighted-average method. Inventory costs primarily consist of chemicals and materials available for resale and parts and consumables used in operations.
Property and equipment	Property and equipment : Property and equipment are stated at cost less accumulated depreciation. ​ ​ Depreciation (and amortization of finance lease assets) is calculated on a straight-line basis over the estimated useful life of each asset as noted below: ​ ​ ​ ​ Asset Classification Useful Life (years) Land Indefinite Buildings and leasehold improvements 30 or lease term Vehicles and equipment 4 - 7 or lease term Machinery and equipment 2 - 12 Pipelines ​ 15 Computer equipment and software 3 - 4 or lease term Office furniture and equipment 7 Disposal wells 7 - 10 ​ Depreciation expense related to the Company’s property and equipment, including amortization of property under finance leases, was $81.6 million, $90.2 million and $108.7 million for the years ended December 31, 2021, 2020 and 2019, respectively. Change in depreciable lives of property and equipment:
Business combination	Business Combinations:
Goodwill and other intangible assets	Goodwill and other intangible assets : Goodwill represents the excess of the purchase price of acquisitions over the fair value of the net assets acquired. Goodwill and other intangible assets not subject to amortization are tested for impairment annually or more frequently if events or changes in circumstances indicate that the asset might be impaired. Intangible assets with finite useful lives are amortized either on a straight-line basis over the asset’s estimated useful life or on a basis that reflects the pattern in which the economic benefits of the intangible assets are realized.
Impairment of goodwill, long lived assets and intangible assets:	Impairment of goodwill, long-lived assets and intangible assets : Long-lived assets, such as property and equipment and finite-lived intangible assets, are evaluated for impairment whenever events or changes in circumstances indicate that its carrying value may not be recoverable. Recoverability is measured by a comparison of its carrying amount to the estimated undiscounted cash flows to be generated by those assets. If the undiscounted cash flows are less than the carrying amount, the Company records impairment losses for the excess of its carrying value over the estimated fair value. The development of future cash flows and the estimate of fair value represent its best estimates based on industry trends and reference to market transactions and are subject to variability. The Company considers the factors within the fair value analysis to be Level 3 inputs within the fair value hierarchy. See “Note 4—Impairments and Other Costs” for further discussion. ​ The Company conducts its annual goodwill impairment tests in the fourth quarter of each year, and whenever impairment indicators arise, by examining relevant events and circumstances which could have a negative impact on its goodwill such as macroeconomic conditions, industry and market conditions, cost factors that have a negative effect on earnings and cash flows, overall financial performance, acquisitions and divestitures and other relevant entity-specific events. If a qualitative assessment indicates that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, the Company is required to perform a quantitative impairment test for goodwill comparing the reporting unit’s carrying value to its fair value. The Company’s reporting units are based on its organizational and reporting structure. In determining fair values for the reporting units, the Company relies primarily on the income and market approaches for valuation. In the income approach, the Company discounts predicted future cash flows using a weighted-average cost of capital calculation based on publicly-traded peer companies. In the market approach, valuation multiples are developed from both publicly-traded peer companies as well as other company transactions. The cost approach, when used, considers replacement cost as the primary indicator of value. If the fair value of a reporting unit is less than its carrying value, goodwill impairment is calculated by subtracting the fair value of the reporting unit from the carrying value. Application of the goodwill impairment test requires judgment, including the identification of reporting units, allocation of assets (including goodwill) and liabilities to reporting units and determining the fair value. The determination of reporting unit fair value relies upon certain estimates and assumptions that are complex and are affected by numerous factors, including the general economic environment and levels of E&P activity of oil and gas companies, the Company’s financial performance and trends and the Company’s strategies and business plans, among others. Unanticipated changes, including immaterial revisions, to these assumptions, could result in a provision for impairment in a future period. Given the nature of these evaluations and their application to specific assets and time frames, it is not possible to reasonably quantify the impact of changes in these assumptions. See “Note 4—Impairments and Other Costs” for further discussion.
Asset retirement obligations	Asset retirement obligations : The asset retirement obligation (“ARO”) liability reflects the present value of estimated costs of plugging, site reclamation and similar activities associated with the Company’s saltwater disposal wells. The Company utilizes current retirement costs to estimate the expected cash outflows for retirement obligations. The Company also estimates the productive life of the disposal wells, a credit-adjusted risk-free discount rate and an inflation factor in order to determine the current present value of this obligation. The Company’s ARO liabilities are included in accrued expenses and other current liabilities and other long-term liabilities as of December 31, 2021, and 2020. The change in asset retirement obligations is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ ​ 2021 2020 ​ ​ (in thousands) Balance at beginning of year ​ $ 999 $ 1,527 Accretion expense, included in depreciation and amortization expense ​ ​ 208 ​ 121 Acquired ARO's ​ ​ 30,672 ​ — Disposals ​ ​ ​ (1,852) ​ ​ (272) Payments ​ ​ ​ (476) ​ ​ (377) Balance at end of year ​ $ 29,551 $ 999 ​ ​ ​ ​ ​ ​ ​ ​ Short-term ARO liability ​ ​ ​ 4,888 ​ ​ 189 Long-term ARO liability ​ ​ ​ 24,663 ​ ​ 810 Balance at end of year ​ ​ $ 29,551 ​ $ 999 ​ In addition to the obligations described above, the Company may be obligated to remove facilities or perform other remediation upon retirement of certain other assets. However, the fair value of the asset retirement obligation cannot currently be reasonably estimated because the settlement dates are indeterminable. If applicable, the Company will record an asset retirement obligation for these assets in the periods in which settlement dates are reasonably determinable.
Retentions	Retentions : The Company assumes risk of loss through deductibles and self-insured retentions, up to certain levels for losses related to general liability, workers’ compensation and employer’s liability, vehicle liability, and effective June 1, 2020, health insurance. The Company’s exposure (i.e., the self-insured retention or deductible) per occurrence is coverages with a limit of $100.0 million in the aggregate. Management regularly reviews its estimates of reported and unreported claims and provide for losses through reserves. As of December 31, 2021, the Company estimated the range of exposure to be from $12.2 million to $14.3 million for worker’s compensation and vehicle liability claims and have recorded liabilities of $13.2 million, which represents management’s best estimate of probable loss related to these claims. Additionally, accrued health insurance and accrued general liabilities were $2.9 million and $0.5 million as of December 31, 2021, respectively. These liabilities are included in accrued insurance and other long-term liabilities depending on whether they are short or long-term in nature.
Defined Contribution Plan	Defined Contribution Plan : The Company sponsors a defined contribution 401(k) Profit Sharing Plan (the “401(k) Plan”) for the benefit of substantially all employees of the Company. The 401(k) Plan allows eligible employees to make tax-deferred contributions, not to exceed annual limits established by the Internal Revenue Service. The During the year ended December 31, 2020, due to worsening economic conditions, the Company suspended the match of its 401(k) Plan and the suspension continued into the first half of 2021. Effective July 1, 2021, the Company reinstated matching contributions of
Payroll Tax Deferral	Payroll Tax Deferral: million must be repaid by December 31, 2022. The remaining deferral is reported under accrued salaries and benefits on the accompanying consolidated balance sheets as of December 31, 2021.
Revenue recognition	Revenue recognition : The Company follows ASU 2014-09, Revenue from Contracts with Customers (Topic 606). . Water Services and Water Infrastructure The Company’s agreements with its customers are often referred to as “price sheets” and sometimes provide pricing for multiple services. However, these agreements generally do not authorize the performance of specific services or provide for guaranteed throughput amounts. As customers are free to choose which services, if any, to use based on the Company’s price sheet, the Company prices its separate services on the basis of their standalone selling prices. Customer agreements generally do not provide for performance-, cancellation-, termination-, or refund-type provisions. Services based on price sheets with customers are generally performed under separately-issued “work orders” or “field tickets” as services are requested. Of the Company’s Water Services and Water Infrastructure service lines, only sourcing and transfer of water are consistently provided as part of the same arrangement. In these instances, revenue for both sourcing and transfer are recognized concurrently when delivered. Additionally, asset rentals are recognized on a straight-line basis. Oilfield Chemical Product Sales— Oilfield Chemicals products are generally sold under sales agreements based upon purchase orders or contracts with customers that do not include right of return provisions or other significant post-delivery obligations. The Company’s products are produced in a standard manufacturing operation, even if produced to the customer’s specifications. The prices of products are fixed and determinable and are established in price lists or customer purchase orders. The Company recognizes revenue from product sales when title passes to the customer, the customer assumes risks and rewards of ownership, collectability is reasonably assured and delivery occurs as directed by the customer.
Equity-based compensation	Equity-based compensation : The Company accounts for equity-based awards for restricted stock awards, restricted stock units, and stock-settled appreciation awards by measuring the awards at the date of grant and recognizing the grant-date fair value as an expense using either straight-line or accelerated attribution, depending on the specific terms of the award agreements over the requisite service period, which is usually equivalent to the vesting period. The Company expenses awards with graded-vesting service conditions on a straight-line basis and accounts for forfeitures as they occur. The Company accounts for performance share units by remeasuring the awards at the end of each reporting period based on the period-end closing share price, factoring in the percentage expected to vest, and the percentage of the service period completed.
Fair value measurements	Fair value measurements : The Company measures certain assets and liabilities pursuant to accounting guidance, which establishes a three-tier fair value hierarchy and prioritizes the inputs used in measuring fair value. Level 1 inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 inputs are quoted prices or other market data for similar assets and liabilities in active markets, or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the asset or liability. Level 3 inputs are unobservable inputs based upon the Company’s own judgment and assumptions used to measure assets and liabilities at fair value. See “Note 13—Fair Value Measurement” for further discussion.
Income taxes	Income taxes The Company and its subsidiaries account for income taxes under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled pursuant to the provisions of Accounting Standards Codification (“ASC”) 740, Income Taxes. The effect on deferred tax assets and liabilities of a change in tax rate is recognized in earnings in the period that includes the enactment date. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts more likely than not to be realized. The determination of the provision for income taxes requires significant judgment, use of estimates and the interpretation and application of complex tax laws. Significant judgment is required in assessing the timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions. The benefits of uncertain tax positions are recorded in the Company’s financial statements only after determining a more likely than not probability that the uncertain tax positions will withstand challenge, if any, from taxing authorities. When facts and circumstances change, the Company reassesses these probabilities and records any changes through the provision for income taxes. The Company recognizes interest and penalties relating to uncertain tax provisions as a component of tax expense. The Company identified no material uncertain tax positions as of December 31, 2021, 2020 and 2019. See “Note 15—Income Taxes” for further discussion.

BUSINESS AND BASIS OF PRESENT_2

BUSINESS AND BASIS OF PRESENTATION (Tables)	12 Months Ended
	Dec. 31, 2021
BUSINESS AND BASIS OF PRESENTATION
Schedule of investments in unconsolidated entities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ​ ​ ​ As of December 31, Type of Investment attained Accounting method Balance Sheet Location ​ 2021 2020 ​ ​ ​ ​ ​ (in thousands) 20% minority interest 2011 Cost-method Other long-term assets, net ​ $ 120 ​ $ 300 Notes receivable 2020 Amortized cost basis Other long-term assets, net ​ ​ 4,446 ​ ​ 3,037 33% minority interest 2021 Equity-method Other long-term assets, net ​ ​ 1,779 ​ ​ — 45% minority interest 2021 Equity-method Other long-term assets, net ​ ​ 142 ​ ​ — Publicly traded securities 2020 Fair value option Prepaid expenses and other current assets ​ ​ 75 ​ ​ 3,377

SIGNIFICANT ACCOUNTING POLICI_3

SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2021
SIGNIFICANT ACCOUNTING POLICIES
Schedule of change in allowance for doubtful accounts	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Balance at beginning of year ​ $ 9,157 $ 5,773 $ 5,329 Increase to allowance based on a percentage of revenue ​ 1,477 1,212 2,641 Adjustment based on aged receivable analysis ​ ​ (1,444) ​ ​ 5,161 ​ ​ (88) Charge-offs ​ (4,793) (3,003) (2,504) Recoveries ​ ​ 4 14 395 Balance at end of year ​ $ 4,401 $ 9,157 $ 5,773
Schedule of estimated useful life of property and equipment	​ ​ ​ ​ Asset Classification Useful Life (years) Land Indefinite Buildings and leasehold improvements 30 or lease term Vehicles and equipment 4 - 7 or lease term Machinery and equipment 2 - 12 Pipelines ​ 15 Computer equipment and software 3 - 4 or lease term Office furniture and equipment 7 Disposal wells 7 - 10
Summary of change in asset retirement obligations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ ​ 2021 2020 ​ ​ (in thousands) Balance at beginning of year ​ $ 999 $ 1,527 Accretion expense, included in depreciation and amortization expense ​ ​ 208 ​ 121 Acquired ARO's ​ ​ 30,672 ​ — Disposals ​ ​ ​ (1,852) ​ ​ (272) Payments ​ ​ ​ (476) ​ ​ (377) Balance at end of year ​ $ 29,551 $ 999 ​ ​ ​ ​ ​ ​ ​ ​ Short-term ARO liability ​ ​ ​ 4,888 ​ ​ 189 Long-term ARO liability ​ ​ ​ 24,663 ​ ​ 810 Balance at end of year ​ ​ $ 29,551 ​ $ 999

ACQUISITIONS AND DIVESTITURES (

ACQUISITIONS AND DIVESTITURES (Tables)	12 Months Ended
	Dec. 31, 2021
Schedule Of consideration transferred and the estimated fair value of identified assets acquired and liabilities	The following table presents key information connected with our 2021 acquisitions (dollars in thousands, except share amounts): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Assets and Operations Acquired Acquisition Date Shares Issued ​ Cash Consideration ​ Contingent Consideration ​ Value of Shares Issued ​ Total Initial Consideration Segments HB Rentals December 3, 2021 1,211,375 $ 1,526 $ — $ 7,135 $ 8,661 Water Services Agua Libre and Basic October 1, 2021 902,593 ​ 16,394 ​ — ​ 4,684 ​ 21,078 Water Services & Water Infrastructure UltRecovery August 2, 2021 — ​ 2,500 ​ 1,058 ​ — ​ 3,558 Oilfield Chemicals Complete July 9, 2021 3,600,000 ​ 14,356 ​ — ​ 20,304 ​ 34,660 Water Services & Water Infrastructure Total ​ 5,713,968 $ 34,776 $ 1,058 $ 32,123 $ 67,957 ​
Schedule of sales details	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Date of Divestiture ​ Entity ​ Initial Net Proceeds ​ Working Capital True Up ​ Adjusted Net Proceeds ​ Working Capital Status at December 31, 2019 ​ (Gain)/loss for the year ended December 31, 2019 ​ ​ ​ ​ (in thousands) February 26, 2019 ​ Affirm ​ $ 10,982 ​ $ (208) ​ $ 10,774 ​ Final ​ $ 208 June 28, 2019 ​ Affirm ​ ​ 6,968 ​ ​ — ​ ​ 6,968 ​ Final ​ ​ (1,646) March 19, 2019 ​ Canada ​ ​ 4,975 ​ ​ (302) ​ ​ 4,673 ​ Final ​ ​ 5,013 April 1, 2019 ​ Canada ​ ​ 2,242 ​ ​ — ​ ​ 2,242 ​ Final ​ ​ 101
HB Rentals
Schedule Of consideration transferred and the estimated fair value of identified assets acquired and liabilities	​ ​ ​ ​ ​ Preliminary purchase price allocation Amount Consideration transferred (in thousands) Class A Common Stock (1,211,375 shares) ​ $ 7,135 Cash paid ​ 1,526 Total consideration transferred ​ 8,661 Less: identifiable assets acquired and liabilities assumed ​ Working capital ​ 29 Property and equipment ​ 14,091 Right-of-use assets ​ 1,316 Long-term lease liabilities ​ ​ (835) Total identifiable net assets acquired ​ 14,601 Bargain Purchase Gain ​ (5,940) Fair value allocated to net assets acquired, net of bargain purchase gain $ 8,661
Aqua Libre and Basic
Schedule Of consideration transferred and the estimated fair value of identified assets acquired and liabilities	​ ​ ​ ​ ​ Preliminary purchase price allocation ​ Amount Consideration transferred ​ (in thousands) Class A Common Stock (902,593 shares) ​ $ 4,684 Cash paid ​ ​ 16,394 Total consideration transferred ​ 21,078 Less: identifiable assets acquired and liabilities assumed ​ ​ Working capital ​ (506) Property and equipment ​ 41,000 Right-of-use assets ​ 309 Long-term ARO ​ ​ (15,810) Long-term lease liabilities ​ ​ (281) Total identifiable net assets acquired ​ ​ 24,712 Bargain Purchase Gain ​ (3,634) Fair value allocated to net assets acquired, net of bargain purchase gain $ 21,078
UltRecovery
Schedule Of consideration transferred and the estimated fair value of identified assets acquired and liabilities	​ ​ ​ ​ ​ Purchase price allocation Amount Consideration transferred and estimated earn-out liability (in thousands) Cash paid ​ $ 2,500 Estimated earn-out liability assumed ​ ​ 1,058 Total purchase price ​ 3,558 Less: identifiable assets acquired ​ Inventory ​ 13 Property and equipment ​ 514 Patents and other intellectual property ​ 3,031 Total identifiable net assets acquired ​ 3,558 Fair value allocated to net assets acquired ​ $ 3,558
Complete Energy Services, Inc.
Schedule Of consideration transferred and the estimated fair value of identified assets acquired and liabilities	​ ​ ​ ​ ​ Preliminary purchase price allocation ​ Amount Consideration transferred ​ (in thousands) Class A Common Stock (3,600,000 shares) ​ $ 20,304 Cash paid ​ ​ 14,356 Total consideration transferred ​ 34,660 Less: identifiable assets acquired and liabilities assumed ​ ​ Working capital ​ 15,783 Property and equipment ​ 36,761 Right-of-use assets ​ 3,331 Other long-term assets ​ ​ 24 Long-term ARO ​ ​ (9,800) Long-term lease liabilities ​ ​ (2,028) Total identifiable net assets acquired ​ ​ 44,071 Bargain Purchase Gain ​ (9,411) Fair value allocated to net assets acquired, net of bargain purchase gain $ 34,660
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

IMPAIRMENTS AND OTHER COSTS (Ta

IMPAIRMENTS AND OTHER COSTS (Tables)	12 Months Ended
	Dec. 31, 2021
IMPAIRMENTS AND OTHER COSTS
Schedule of severance costs	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2021 ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Impairment and abandonment of property and equipment ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ — ​ $ 3,894 ​ $ 969 Water Infrastructure ​ ​ — ​ ​ 4,016 ​ ​ 1,804 Other ​ ​ — ​ ​ — ​ ​ 942 Total impairment and abandonment of property and equipment ​ $ — ​ $ 7,910 ​ $ 3,715 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ ​ 2021 ​ 2020 2019 ​ ​ (in thousands) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Severance ​ ​ ​ ​ ​ ​ ​ ​ ​ Costs of revenue - Water services ​ $ — ​ $ 2,929 ​ $ — Costs of revenue - Water infrastructure ​ ​ — ​ ​ 452 ​ ​ — Costs of revenue - Oilfield chemicals ​ ​ — ​ ​ 626 ​ ​ — Selling, general and administrative ​ ​ 3,225 ​ ​ 3,161 ​ ​ 1,691 Total severance expense ​ $ 3,225 ​ $ 7,168 ​ $ 1,691 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Yard closure costs ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ — ​ $ 2,645 ​ $ — Oilfield Chemicals ​ ​ — ​ ​ 316 ​ ​ — Total yard closure costs ​ $ — ​ $ 2,961 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease abandonment costs ​ ​ ​ ​ ​ ​ ​ ​ ​ Water Services ​ $ 888 ​ $ 4,321 ​ $ 1,218 Water Infrastructure ​ ​ 1 ​ ​ 51 ​ ​ — Oilfield Chemicals ​ ​ — ​ ​ 42 ​ ​ 11 Other ​ ​ 5 ​ ​ (64) ​ ​ 844 Total lease abandonment costs ​ $ 894 ​ $ 4,350 ​ $ 2,073

REVENUE (Tables)

REVENUE (Tables)	12 Months Ended
	Dec. 31, 2021
REVENUE
Schedule of disaggregation of revenue by geographic location	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Geographic Region ​ ​ ​ ​ ​ ​ ​ ​ ​ Permian Basin ​ $ 371,067 ​ $ 278,439 ​ $ 610,528 Eagle Ford ​ ​ 99,656 ​ ​ 69,440 ​ ​ 156,621 Rockies ​ ​ 78,189 ​ ​ 37,517 ​ ​ 85,339 Haynesville/E. Texas ​ ​ 74,797 ​ ​ 73,116 ​ ​ 73,658 Mid-Continent ​ ​ 64,912 ​ ​ 56,687 ​ ​ 176,216 Marcellus/Utica ​ ​ 62,508 ​ ​ 54,473 ​ ​ 96,454 Bakken ​ ​ 19,077 ​ ​ 38,986 ​ ​ 92,956 Eliminations and other regions ​ ​ (5,586) ​ ​ (3,553) ​ ​ (183) Total ​ $ 764,620 ​ $ 605,105 ​ $ 1,291,589

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2021
LEASES
Schedule of financial impact of leases	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Balance Sheet Classification December 31, 2021 ​ December 31, 2020 ​ ​ ​ ​ (in thousands) Assets ​ ​ ​ ​ ​ ​ ​ ​ Right-of-use assets (1) ​ Long-term right-of-use assets ​ $ 47,732 ​ $ 52,331 Finance lease assets ​ Property and equipment ​ ​ 134 ​ ​ 302 Liabilities ​ ​ ​ ​ ​ ​ ​ ​ Operating lease liabilities ― ST ​ Current operating lease liabilities ​ $ 13,997 ​ $ 14,019 Operating lease liabilities ― LT ​ Long-term operating lease liabilities ​ ​ 53,198 ​ ​ 60,984 Finance lease liabilities ― ST ​ Current portion of finance lease obligations ​ ​ 113 ​ ​ 307 Finance lease liabilities ― LT ​ Other long term liabilities ​ ​ 24 ​ ​ 94 ​ (1) Right-of-use asset impairment of $0 , $3.6 million and $0.6 million for the years ended December 31, 2021, 2020 and 2019, respectively, is recorded within lease abandonment costs in the accompanying consolidated statements of operations. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, Statements of Operations and Cash Flows Classification 2021 ​ 2020 ​ 2019 ​ ​ ​ ​ (in thousands) Operating lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease cost ― fixed ​ Cost of revenue and Selling, general and administrative ​ $ 13,762 ​ $ 19,968 ​ $ 27,856 Lease abandonment costs ​ Lease abandonment costs ​ ​ 894 ​ ​ 4,350 ​ ​ 2,073 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Short-term agreements: ​ Cost of revenue ​ $ 54,301 ​ $ 44,062 ​ $ 93,949 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Finance lease cost: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortization of leased assets ​ Depreciation and amortization ​ $ 230 ​ $ 314 ​ $ 916 Interest on lease liabilities ​ Interest expense, net ​ ​ 10 ​ ​ 14 ​ ​ 32 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lessor income: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Sublease income ​ Cost of sales and lease abandonment costs ​ $ 1,080 ​ $ 1,463 ​ $ 1,544 Lessor income ​ Cost of sales ​ ​ 335 ​ ​ 350 ​ ​ 478 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Statement of cash flows ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for operating leases ​ Operating cash flows ​ $ 19,004 ​ $ 22,385 ​ $ 30,670 Cash paid for finance leases lease interest ​ Operating cash flows ​ ​ 10 ​ ​ 14 ​ ​ 32 Cash paid for finance leases ​ Financing cash flows ​ ​ 320 ​ ​ 264 ​ ​ 883 ​ ​ ​ ​ ​ ​ ​ ​ ​ Long Term and Discount Rate As of December 31, 2021 As of December 31, 2020 Weighted-average remaining lease term (years) ​ ​ ​ ​ ​ ​ Operating leases ​ 5.9 ​ ​ 6.7 ​ Finance leases ​ 1.0 ​ ​ 1.3 ​ Weighted-average discount rate ​ ​ ​ ​ ​ ​ Operating leases ​ 4.6 % ​ 4.7 % Finance leases ​ 3.4 % ​ 3.6 %
Schedule of operating and finance lease commitments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Period Operating Leases (1) Finance Leases Total ​ ​ (in thousands) 2022 ​ $ 19,227 ​ $ 115 ​ $ 19,342 2023 ​ 14,012 ​ 20 ​ 14,032 2024 ​ 12,131 ​ 5 ​ 12,136 2025 ​ 11,010 ​ — ​ 11,010 2026 ​ 9,632 ​ — ​ 9,632 Thereafter ​ 13,936 ​ — ​ 13,936 Total minimum lease payments ​ $ 79,948 ​ $ 140 ​ $ 80,088 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less reconciling items to reconcile undiscounted cash flows to lease liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Short-term leases excluded from balance sheet ​ ​ 2,450 ​ ​ — ​ ​ 2,450 Imputed interest ​ ​ 10,303 ​ ​ 3 ​ ​ 10,306 Total reconciling items ​ ​ 12,753 ​ ​ 3 ​ ​ 12,756 Total liabilities per balance sheet ​ $ 67,195 ​ $ 137 ​ $ 67,332 ​ (1) The table above excludes sublease and lessor income of $1.2 million during 2022, $0.6 million during 2023, $0.3 million during 2024, $0.3 million during 2025 and $0.2 million during 2026.

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
	Dec. 31, 2021
INVENTORIES
Schedule of inventory	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, ​ ​ 2021 2020 ​ ​ (in thousands) Raw materials ​ $ 20,396 ​ $ 16,701 Finished goods ​ 24,060 ​ 16,683 Total ​ $ 44,456 ​ $ 33,384

PROPERTY AND EQUIPMENT (Tables)

PROPERTY AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2021
PROPERTY AND EQUIPMENT.
Schedule of property and equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, ​ ​ 2021 2020 ​ ​ (in thousands) Machinery and equipment ​ $ 626,633 ​ $ 596,441 Buildings and leasehold improvements ​ 108,177 ​ 93,236 Pipelines ​ ​ 72,829 ​ ​ 72,458 Disposal wells ​ 63,228 ​ 48,097 Vehicles and equipment ​ 28,502 ​ 30,975 Land ​ ​ 16,873 ​ ​ 13,497 Computer equipment and software ​ ​ 5,395 ​ ​ 7,127 Office furniture and equipment ​ 764 ​ 892 Machinery and equipment - finance lease ​ 544 ​ 537 Vehicles and equipment - finance lease ​ 324 ​ 475 Computer equipment and software - finance lease ​ 412 ​ 356 Construction in progress ​ 19,834 ​ 14,811 ​ ​ 943,515 ​ 878,902 Less accumulated depreciation (1) ​ (551,727) ​ (528,537) Total property and equipment, net ​ $ 391,788 ​ $ 350,365 ​ (1) Includes $1.1 million of accumulated depreciation related to finance leases as of both December 31, 2021 and December 31, 2020.
Schedule of amortization of intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, ​ 2021 ​ 2020 2019 ​ ​ (in thousands) Category ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation expense from property and equipment ​ $ 81,381 ​ $ 89,848 ​ $ 107,738 Amortization expense from finance leases ​ ​ 230 ​ ​ 314 ​ ​ 916 Amortization expense from intangible assets ​ ​ 10,639 ​ ​ 11,661 ​ ​ 11,900 Accretion expense from asset retirement obligations ​ ​ 208 ​ ​ (151) ​ ​ 115 Total depreciation and amortization ​ $ 92,458 ​ $ 101,672 ​ $ 120,669

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2021
GOODWILL AND OTHER INTANGIBLE ASSETS.
Schedule of changes in the carrying amounts of goodwill by reportable segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water ​ Water ​ ​ ​ ​ Services Infrastructure Total ​ ​ (in thousands) Balance as of December 31, 2019 ​ $ 186,468 ​ $ 80,466 ​ $ 266,934 Impairment ​ ​ (186,468) ​ ​ (80,466) ​ ​ (266,934) Balance as of December 31, 2020 ​ $ — ​ $ — ​ $ — ​
Summary of components of other intangible assets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of December 31, 2021 ​ As of December 31, 2020 ​ Gross Accumulated Net Gross ​ ​ Accumulated Net ​ ​ Value ​ Amortization ​ Value ​ Value ​ Impairment ​ Amortization ​ Value ​ ​ (in thousands) ​ (in thousands) Definite-lived ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Customer relationships ​ $ 116,554 ​ $ (38,371) ​ $ 78,183 ​ $ 116,554 ​ $ — ​ $ (29,302) ​ $ 87,252 Patents and other intellectual property ​ ​ 12,772 ​ ​ (4,313) ​ ​ 8,459 ​ ​ 9,741 ​ ​ — ​ ​ (3,166) ​ ​ 6,575 Other ​ ​ 7,234 ​ ​ (6,795) ​ ​ 439 ​ 7,234 ​ ​ — ​ (6,373) ​ 861 Total definite-lived ​ ​ 136,560 ​ ​ (49,479) ​ ​ 87,081 ​ ​ 133,529 ​ ​ — ​ ​ (38,841) ​ ​ 94,688 Indefinite-lived ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Water rights ​ ​ 7,031 ​ ​ — ​ ​ 7,031 ​ ​ 7,031 ​ ​ — ​ ​ — ​ ​ 7,031 Trademarks ​ ​ 14,360 ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ (9,082) ​ ​ — ​ ​ 14,360 Total indefinite-lived ​ ​ 21,391 ​ ​ — ​ ​ 21,391 ​ ​ 30,473 ​ ​ (9,082) ​ ​ — ​ ​ 21,391 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total other intangible assets, net ​ $ 157,951 ​ $ (49,479) ​ $ 108,472 ​ $ 164,002 ​ $ (9,082) ​ $ (38,841) ​ $ 116,079
Summary of future estimated amortization expense for other intangible assets	​ ​ ​ ​ ​ Year Ending December 31, Amount ​ ​ (in thousands) 2022 ​ $ 10,666 2023 ​ 10,594 2024 ​ 10,525 2025 ​ 10,362 2026 ​ 10,274 Thereafter ​ ​ 34,660 Total ​ $ 87,081

DEBT (Tables)

DEBT (Tables)	12 Months Ended
	Dec. 31, 2021
DEBT
Summary of Company's leverage ratio	​ ​ ​ ​ ​ ​ ​ ​ Level ​ Average Excess Availability ​ Base Rate Margin ​ Eurocurrency Rate Margin ​ ​ ​ ​ ​ ​ ​ I ​ < 33.33% 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)	12 Months Ended
	Dec. 31, 2021
Schedule of equity option activity and related information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average ​ ​ ​ ​ ​ ​ ​ Weighted-average ​ Weighted-average ​ Grant Date Value ​ Aggregate Intrinsic ​ Stock Options Grant Date Value ​ Exercise Price Term (Years) Value (in thousands) (a) Beginning balance, outstanding 3,519,159 ​ $ 8.58 ​ $ 16.11 ​ 3.3 ​ $ — Expired ​ (1,444,943) ​ ​ 6.80 ​ ​ 15.00 ​ ​ ​ ​ ​ Ending balance, outstanding 2,074,216 ​ $ 9.82 ​ $ 16.89 ​ 4.4 ​ $ — Ending balance, exercisable ​ 2,074,216 ​ $ 9.82 ​ $ 16.89 ​ 4.4 ​ $ — Nonvested as of December 31, 2021 ​ — ​ ​ N/A ​ $ — ​ ​ ​ ​ ​ (a) Aggregate intrinsic value for stock options is based on the difference between the exercise price of the stock options and the quoted closing Class A Common Stock price of $6.23 and $4.10 as of December 31, 2021 and 2020, respectively.
summary of ESPP activity	The following table summarizes ESPP activity (in thousands, except shares): ​ ​ ​ ​ ​ ​ For the year ended ​ December 31, 2021 Cash received for shares issued ​ $ 58 Shares issued ​ ​ 10,518
Restricted Stock
Schedule of restricted stock activity	​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2021 ​ ​ ​ ​ Weighted-average ​ Restricted Stock Awards Grant Date Fair Value Nonvested as of December 31, 2020 ​ 2,003,072 ​ $ 6.97 Granted ​ 2,154,897 ​ ​ 6.29 Vested ​ (693,582) ​ ​ 7.92 Forfeited ​ (319,874) ​ ​ 6.41 Nonvested as of December 31, 2021 ​ 3,144,513 ​ $ 6.35
Restricted Stock Units
Schedule of restricted stock activity	​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2020 ​ ​ ​ ​ Weighted-average ​ Restricted Stock Units Grant Date Fair Value Nonvested as of December 31, 2019 1,250 ​ $ 19.00 Vested (625) ​ ​ 20.00 Forfeited (625) ​ ​ 18.00 Nonvested as of December 31, 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, 2020 ​ 1,763,909 Target shares granted ​ 689,551 Target shares forfeited ​ (247,856) Target shares outstanding as of December 31, 2021 ​ 2,205,604

FAIR VALUE MEASUREMENT (Tables)

FAIR VALUE MEASUREMENT (Tables)	12 Months Ended
	Dec. 31, 2021
FAIR VALUE MEASUREMENT
Summary of assets and liabilities measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measurements Using ​ Carrying ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 ​ Level 2 ​ Level 3 ​ Value (1) ​ Impairment ​ ​ ​ ​ ​ ​ (in thousands) Year Ended December 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investments ​ Recurring ​ March 31 ​ $ 1,546 ​ $ — ​ $ — ​ $ 1,546 ​ $ — Investments ​ Recurring ​ June 30 ​ ​ 2,208 ​ ​ — ​ ​ — ​ ​ 2,208 ​ ​ — Investments ​ Recurring ​ September 30 ​ ​ 1,717 ​ ​ — ​ ​ — ​ ​ 1,717 ​ ​ — Investments ​ Recurring ​ December 31 ​ ​ 75 ​ ​ — ​ ​ — ​ ​ 75 ​ ​ — Year Ended December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Goodwill ​ Non-recurring ​ March 31 ​ $ — ​ $ — ​ $ — ​ $ 266,934 ​ $ 266,934 Trademark ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ 9,082 Property and equipment ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 176 ​ ​ 3,360 ​ ​ 3,184 Property and equipment ​ Non-recurring ​ June 30 ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,726 ​ ​ 4,726 Investments ​ Recurring ​ September 30 ​ ​ — ​ ​ 1,768 ​ ​ — ​ ​ 1,768 ​ ​ — Investments ​ Recurring ​ December 31 ​ ​ 3,377 ​ ​ — ​ ​ — ​ ​ 3,377 ​ ​ — Year Ended December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Goodwill ​ Non-recurring ​ March 31 ​ $ — ​ $ — ​ $ — ​ $ 4,396 ​ $ 4,396 Property and equipment ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 2,346 ​ ​ 2,865 ​ ​ 519 Property and equipment ​ Non-recurring ​ June 30 ​ ​ — ​ ​ — ​ ​ 2,386 ​ ​ 2,760 ​ ​ 374 Property and equipment ​ Non-recurring ​ September 30 ​ ​ — ​ ​ — ​ ​ 38 ​ ​ 87 ​ ​ 49 Property and equipment ​ Non-recurring ​ December 31 ​ ​ — ​ ​ — ​ ​ 2,555 ​ ​ 5,328 ​ ​ 2,773 ​ (1) Amount represents carrying value at the date of assessment.
Summary of assets and liabilities measured at fair value on a non-recurring basis	The following table presents information about the Company’s assets measured at fair value on a recurring and non-recurring basis for the years ended December 31, 2021, 2020 and 2019. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Measurements Using ​ Carrying ​ ​ ​ ​ ​ ​ ​ ​ ​ Level 1 ​ Level 2 ​ Level 3 ​ Value (1) ​ Impairment ​ ​ ​ ​ ​ ​ (in thousands) Year Ended December 31, 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investments ​ Recurring ​ March 31 ​ $ 1,546 ​ $ — ​ $ — ​ $ 1,546 ​ $ — Investments ​ Recurring ​ June 30 ​ ​ 2,208 ​ ​ — ​ ​ — ​ ​ 2,208 ​ ​ — Investments ​ Recurring ​ September 30 ​ ​ 1,717 ​ ​ — ​ ​ — ​ ​ 1,717 ​ ​ — Investments ​ Recurring ​ December 31 ​ ​ 75 ​ ​ — ​ ​ — ​ ​ 75 ​ ​ — Year Ended December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Goodwill ​ Non-recurring ​ March 31 ​ $ — ​ $ — ​ $ — ​ $ 266,934 ​ $ 266,934 Trademark ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 14,360 ​ ​ 23,442 ​ ​ 9,082 Property and equipment ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 176 ​ ​ 3,360 ​ ​ 3,184 Property and equipment ​ Non-recurring ​ June 30 ​ ​ — ​ ​ — ​ ​ — ​ ​ 4,726 ​ ​ 4,726 Investments ​ Recurring ​ September 30 ​ ​ — ​ ​ 1,768 ​ ​ — ​ ​ 1,768 ​ ​ — Investments ​ Recurring ​ December 31 ​ ​ 3,377 ​ ​ — ​ ​ — ​ ​ 3,377 ​ ​ — Year Ended December 31, 2019 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Goodwill ​ Non-recurring ​ March 31 ​ $ — ​ $ — ​ $ — ​ $ 4,396 ​ $ 4,396 Property and equipment ​ Non-recurring ​ March 31 ​ ​ — ​ ​ — ​ ​ 2,346 ​ ​ 2,865 ​ ​ 519 Property and equipment ​ Non-recurring ​ June 30 ​ ​ — ​ ​ — ​ ​ 2,386 ​ ​ 2,760 ​ ​ 374 Property and equipment ​ Non-recurring ​ September 30 ​ ​ — ​ ​ — ​ ​ 38 ​ ​ 87 ​ ​ 49 Property and equipment ​ Non-recurring ​ December 31 ​ ​ — ​ ​ — ​ ​ 2,555 ​ ​ 5,328 ​ ​ 2,773 ​ (1) Amount represents carrying value at the date of assessment.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2021
INCOME TAXES
Summary of components of the federal and state income tax expense (benefit)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended ​ ​ December 31, ​ 2021 2020 2019 ​ ​ (in thousands) Current tax (benefit) expense ​ ​ ​ Federal income tax expense (benefit) ​ $ 126 ​ $ (941) ​ $ 696 State and local income tax (benefit) expense ​ (262) ​ (439) ​ 1,034 Total current (benefit) expense ​ (136) ​ (1,380) ​ 1,730 Deferred tax expense (benefit) ​ ​ ​ Federal income tax expense (benefit) ​ 56 ​ (105) ​ 49 State and local income tax expense (benefit) ​ 227 ​ 9 ​ 170 Total deferred expense (benefit) ​ 283 ​ (96) ​ 219 Total income tax expense (benefit) ​ $ 147 ​ $ (1,476) ​ $ 1,949 Tax expense (benefit) attributable to controlling interests ​ $ 124 ​ $ (1,246) ​ $ 1,488 Tax expense (benefit) attributable to noncontrolling interests ​ 23 ​ (230) ​ 461 Total income tax expense (benefit) ​ $ 147 ​ $ (1,476) ​ $ 1,949
Summary of reconciliation of the provision for income taxes	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ ​ ​ 2021 ​ 2020 ​ 2019 ​ ​ ​ (in thousands) ​ Provision calculated at federal statutory income tax rate: ​ ​ ​ ​ ​ ​ ​ ​ (Loss) income before equity in losses of unconsolidated entities and taxes ​ $ (49,659) ​ ​ $ (403,208) ​ ​ $ 6,085 ​ Equity in losses of unconsolidated entities ​ ​ (279) ​ ​ ​ — ​ ​ ​ — ​ (Loss) income before taxes ​ ​ (49,938) ​ ​ ​ (403,208) ​ ​ ​ 6,085 ​ Statutory rate ​ 21 % ​ 21 % ​ 21 % Income tax (benefit) expense computed at statutory rate ​ (10,487) ​ ​ (84,674) ​ ​ 1,278 ​ Less: noncontrolling interests ​ 1,651 ​ ​ 13,272 ​ ​ (284) ​ Income tax (benefit) expense attributable to controlling interests ​ (8,836) ​ ​ (71,402) ​ ​ 994 ​ State and local income taxes, net of federal benefit ​ (30) ​ ​ (430) ​ ​ 884 ​ State rate change ​ (2,787) ​ ​ 179 ​ ​ 1,359 ​ Change in subsidiary tax status ​ ​ 679 ​ ​ ​ (409) ​ ​ ​ 587 ​ Deferred tax adjustments ​ ​ 4,804 ​ ​ ​ — ​ ​ ​ — ​ CARES Act NOL carryback benefit ​ ​ — ​ ​ ​ (459) ​ ​ ​ — ​ Change in valuation allowance ​ 6,119 ​ ​ 71,275 ​ ​ (3,192) ​ Deferred adjustment due to restructuring ​ ​ — ​ ​ ​ — ​ ​ ​ 856 ​ Other ​ ​ 175 ​ ​ ​ — ​ ​ ​ — ​ Income tax expense (benefit) attributable to controlling interests ​ 124 ​ ​ (1,246) ​ ​ 1,488 ​ Income tax expense (benefit) attributable to noncontrolling interests ​ 23 ​ ​ (230) ​ ​ 461 ​ Total income tax expense (benefit) ​ $ 147 ​ ​ $ (1,476) ​ ​ $ 1,949 ​
Summary of principal components of the deferred tax assets (liabilities)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended ​ ​ December 31, ​ 2021 2020 ​ ​ (in thousands) Deferred tax assets ​ ​ Outside basis difference in SES Holdings ​ $ 62,110 ​ $ 78,918 Net operating losses ​ 92,366 ​ 69,601 Credits and other carryforwards ​ 4,316 ​ 4,111 Other ​ ​ 43 ​ ​ 541 Total deferred tax assets before valuation allowance ​ 158,835 ​ 153,171 Valuation allowance ​ ​ (158,779) ​ ​ (152,659) Total deferred tax assets ​ ​ 56 ​ ​ 512 Deferred tax liabilities ​ ​ Property and equipment ​ 530 ​ 718 Other ​ 56 ​ 41 Total deferred tax liabilities ​ 586 ​ 759 Net deferred tax liabilities ​ $ (530) ​ $ (247)

NONCONTROLLING INTERESTS (Table

NONCONTROLLING INTERESTS (Tables)	12 Months Ended
	Dec. 31, 2021
NONCONTROLLING INTERESTS
Schedule of Non Controlling Interests Categories	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ ​ ​ December 31, 2021 December 31, 2020 ​ ​ ​ ​ (in thousands) ​ Noncontrolling interests attributable to joint ventures formed for water-related services ​ ​ $ 1,091 $ 2,002 ​ Noncontrolling interests attributable to holders of Class B Common Stock ​ ​ ​ 101,987 110,819 ​ Total noncontrolling interests ​ ​ $ 103,078 $ 112,821 ​
Summary of the effects of changes in noncontrolling interests	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ 2021 2020 2019 ​ ​ (in thousands) Net (loss) income attributable to Select Energy Services, Inc. ​ $ (42,225) $ (338,684) $ 2,784 Transfers from (to) noncontrolling interests: ​ ​ ​ ​ ​ Increase in additional paid-in capital as a result of issuing shares for business combinations ​ ​ 532 ​ ​ — ​ ​ — Increase in additional paid-in capital as a result of stock option exercises ​ — — 54 Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures ​ 1,847 1,874 3,614 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 ​ (19) (1,416) (3,362) Increase in additional paid-in capital as a result of exchanges of SES Holdings LLC Units (an equivalent number of shares of Class B Common Stock) for shares of Class A Common Stock ​ ​ — ​ ​ — ​ ​ 107,062 Increase in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued ​ ​ 1 ​ ​ 7 ​ ​ 42 Change to equity from net (loss) income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests ​ $ (39,864) $ (338,218) $ 110,198

(LOSS) EARNINGS PER SHARE (Tabl

(LOSS) EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2021
(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 earnings per share for the years ended December 31, 2021, 2020 and 2019 (dollars in thousands, except share and per share amounts): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2021 ​ ​ Select Energy ​ ​ ​ ​ ​ ​ ​ Services, Inc. Class A Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss ​ $ (50,085) ​ ​ ​ ​ ​ ​ Net loss attributable to noncontrolling interests ​ ​ 7,860 ​ ​ ​ ​ ​ ​ Net loss attributable to Select Energy Services, Inc. — basic ​ $ (42,225) ​ $ (42,225) ​ $ — Net loss attributable to Select Energy Services, Inc. — diluted ​ $ (42,225) ​ $ (42,225) ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 87,275,467 ​ ​ 16,221,101 Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 87,275,467 ​ ​ 16,221,101 Loss per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ (0.48) ​ $ — Diluted ​ ​ ​ ​ $ (0.48) ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2020 ​ ​ Select Energy Services, Inc. ​ Class A ​ Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss attributable to Select Energy Services, Inc. — diluted ​ $ (401,732) ​ ​ ​ ​ ​ ​ Net loss attributable to noncontrolling interests ​ ​ 63,048 ​ ​ ​ ​ ​ ​ Net loss attributable to Select Energy Services, Inc. — basic ​ $ (338,684) ​ $ (338,684) ​ $ — Net loss attributable to Select Energy Services, Inc. — diluted ​ $ (338,684) ​ $ (338,684) ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 85,158,764 ​ ​ 16,221,101 Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 85,158,764 ​ ​ 16,221,101 Loss per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ (3.98) ​ $ — Diluted ​ ​ ​ ​ $ (3.98) ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2019 ​ ​ Select Energy Services, Inc. ​ Class A ​ Class B Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 4,136 ​ ​ ​ ​ ​ ​ Net income attributable to noncontrolling interests ​ ​ (1,352) ​ ​ ​ ​ ​ ​ Net income attributable to Select Energy Services, Inc. — basic ​ $ 2,784 ​ $ 2,784 ​ $ — Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of restricted stock ​ ​ 7 ​ ​ 7 ​ ​ — Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of performance share units ​ ​ 2 ​ ​ 2 ​ ​ — Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of stock options ​ ​ 1 ​ ​ 1 ​ ​ — Net income attributable to Select Energy Services, Inc. — diluted ​ $ 2,794 ​ $ 2,794 ​ $ — Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average shares of common stock outstanding — basic ​ ​ ​ ​ ​ 80,176,323 ​ ​ 23,806,646 Dilutive effect of restricted stock ​ ​ ​ ​ ​ 373,366 ​ ​ — Dilutive effect of stock options ​ ​ ​ ​ ​ 80,979 ​ ​ — Dilutive effect of stock options ​ ​ ​ ​ ​ 40,215 ​ ​ — Dilutive effect of ESPP ​ ​ ​ ​ ​ 446 ​ ​ — Weighted-average shares of common stock outstanding — diluted ​ ​ ​ ​ ​ 80,671,329 ​ ​ 23,806,646 Earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic ​ ​ ​ ​ $ 0.03 ​ $ — Diluted ​ ​ ​ ​ $ 0.03 ​ $ —

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2021
SEGMENT INFORMATION
Summary of financial information by segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2021 ​ ​ ​ Loss Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 399,709 ​ $ (26,219) ​ $ 53,777 ​ $ 18,296 Water Infrastructure ​ ​ 155,323 ​ ​ 2,689 ​ ​ 26,957 ​ ​ 22,043 Oilfield Chemicals ​ ​ 216,410 ​ ​ 1,984 ​ ​ 9,294 ​ ​ 5,010 Other ​ ​ — ​ ​ (19) ​ ​ — ​ ​ 1,032 Eliminations ​ (6,822) ​ — ​ — ​ — Loss from operations ​ ​ ​ (21,565) ​ ​ ​ ​ Corporate ​ — ​ (43,975) ​ 2,430 ​ — Interest expense, net ​ — ​ (1,711) ​ — ​ — Bargain purchase gain ​ ​ — ​ ​ 18,985 ​ ​ — ​ ​ — Other expense, net ​ — ​ (1,393) ​ — ​ — ​ ​ $ 764,620 ​ $ (49,659) ​ $ 92,458 ​ $ 46,381 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2020 ​ ​ ​ Loss Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 322,461 ​ $ (250,779) ​ $ 61,758 ​ $ 2,161 Water Infrastructure ​ ​ 125,710 ​ ​ (96,290) ​ ​ 27,599 ​ ​ 6,852 Oilfield Chemicals ​ ​ 160,825 ​ ​ (13,365) ​ ​ 9,443 ​ ​ 7,157 Other ​ ​ — ​ ​ (733) ​ ​ — ​ ​ 330 Eliminations ​ (3,891) ​ — ​ — ​ — Loss from operations ​ ​ ​ (361,167) ​ ​ ​ ​ Corporate ​ — ​ (33,610) ​ 2,872 ​ — Interest expense, net ​ — ​ (2,136) ​ — ​ — Other expense, net ​ — ​ (6,295) ​ — ​ — ​ ​ $ 605,105 ​ $ (403,208) ​ $ 101,672 ​ $ 16,500 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2019 ​ ​ ​ Income (loss) Depreciation and Capital ​ ​ Revenue ​ before taxes ​ Amortization ​ Expenditures ​ ​ (in thousands) Water Services ​ $ 773,946 ​ $ 51,185 ​ $ 80,664 ​ $ 37,692 Water Infrastructure ​ ​ 221,661 ​ ​ 15,103 ​ ​ 25,665 ​ ​ 53,839 Oilfield Chemicals ​ ​ 268,963 ​ ​ 17,942 ​ ​ 8,766 ​ ​ 11,110 Other ​ ​ 33,365 ​ ​ (8,066) ​ ​ 1,714 ​ ​ 64 Eliminations ​ (6,346) ​ — ​ — ​ — Income from operations ​ ​ ​ 76,164 ​ ​ ​ ​ Corporate ​ — ​ (53,090) ​ 3,860 ​ — Interest expense, net ​ — ​ (2,688) ​ — ​ — Other expense, net ​ — ​ (14,301) ​ — ​ — ​ ​ $ 1,291,589 ​ $ 6,085 ​ $ 120,669 ​ $ 102,705 ​ Total assets by segment as of December 31, 2021 and 2020 are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of ​ As of ​ December 31, 2021 December 31, 2020 ​ ​ (in thousands) Water Services ​ $ 533,071 ​ $ 515,856 Water Infrastructure ​ 229,803 ​ 204,995 Oilfield Chemicals ​ 180,732 ​ 147,612 Other ​ ​ 6,586 ​ ​ 6,896 ​ ​ $ 950,192 ​ $ 875,359 ​
Revenue from External Customers by Products and Services	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, ​ 2021 2020 ​ 2019 ​ ​ (in thousands) Oilfield chemicals ​ $ 216,410 ​ $ 160,825 ​ $ 268,963 Water transfer ​ ​ 175,153 ​ ​ 146,728 ​ ​ 355,535 Pipeline logistics and disposal ​ ​ 108,629 ​ ​ 91,971 ​ ​ 101,145 Accommodations and rentals ​ 64,467 ​ ​ 56,973 ​ ​ 139,950 Flowback and well testing ​ ​ 75,610 ​ ​ 61,839 ​ ​ 208,572 Fluid hauling ​ ​ 85,355 ​ ​ 58,368 ​ ​ 73,999 Water sourcing ​ 46,695 ​ 33,739 ​ ​ 120,517 Eliminations and other service lines ​ (7,699) ​ (5,338) ​ ​ 22,908 ​ ​ $ 764,620 ​ $ 605,105 ​ $ 1,291,589

BUSINESS AND BASIS OF PRESENT_3

BUSINESS AND BASIS OF PRESENTATION (Details)	12 Months Ended
	Dec. 31, 2021itemVotesegment$ / shares	Dec. 31, 2020$ / shares
Number of vote per share | Vote	1
Number of equity method investee	2
Number of cost-method investee	1
Number of investment in notes receivable	1
Number of investment in publicly traded securities	1
Number of operating segments | segment	3
Class A Common Stock
Par value | $ / shares	$ 0.01	$ 0.01
Class B Common Stock
Par value | $ / shares	$ 0.01	$ 0.01

BUSINESS AND BASIS OF PRESENT_4

BUSINESS AND BASIS OF PRESENTATION - Investments in Unconsolidated (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other long-term assets, net
Notes receivable	$ 4,446	$ 3,037
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets	$ 75	3,377
Investment in Joint Venture One
Percentage of interest in a joint venture	20.00%
Investment in Joint Venture One | Other long-term assets, net
20% minority interest	$ 120	$ 300
Investment in Joint Venture Two
Percentage of interest in a joint venture	33.00%
Investment in Joint Venture Two | Other long-term assets, net
percentage of minority interest	$ 1,779
Investment In Joint Venture Three [Member]
Percentage of interest in a joint venture	45.00%
Investment In Joint Venture Three [Member] | Other long-term assets, net
percentage of minority interest	$ 142

SIGNIFICANT ACCOUNTING POLICI_4

SIGNIFICANT ACCOUNTING POLICIES - Allowance activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)customer	Dec. 31, 2020USD ($)customer	Dec. 31, 2019USD ($)customer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of the period	$ 9,157	$ 5,773	$ 5,329
Increase to allowance based on a percentage of revenue	1,477	1,212	2,641
Adjustment based on aged receivable analysis	(1,444)	5,161	(88)
Charge-offs	(4,793)	(3,003)	(2,504)
Recoveries	4	14	395
Balance at end of the period	$ 4,401	$ 9,157	$ 5,773
Concentrations of credit and customer risk
Number of customers accounting for more than 10% of consolidated revenues | customer	0	0	0
Notes receivable with affiliates
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at end of the period	$ 0
Notes receivables	$ 4,400

SIGNIFICANT ACCOUNTING POLICI_5

SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
PROPERTY AND EQUIPMENT.
Depreciation and amortization	$ 2,430	$ 2,872	$ 3,860
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of year	999	1,527
Accretion expense, included in depreciation and amortization expense	208	121
Acquires ARO's	30,672
Disposals	(1,852)	(272)
Payments	(476)	(377)
Balance at end of year	29,551	999	1,527
Short-term ARO liability	4,888	189
Long-term ARO liability	$ 24,663	810
Buildings and leasehold improvements
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	30 years
Vehicles and equipment | Minimum
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	4 years
Vehicles and equipment | Maximum
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	7 years
Machinery and equipment
PROPERTY AND EQUIPMENT.
Depreciation and amortization	$ 81,600	$ 90,200	$ 108,700
Machinery and equipment | Minimum
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	2 years
Machinery and equipment | Maximum
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	12 years
Pipelines
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	15 years
Computer equipment and software | Minimum
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	3 years
Computer equipment and software | Maximum
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	4 years
Office furniture and equipment
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	7 years
Disposal wells | Minimum
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	7 years
Disposal wells | Maximum
PROPERTY AND EQUIPMENT.
Estimated useful lives of the assets	10 years

SIGNIFICANT ACCOUNTING POLICI_6

SIGNIFICANT ACCOUNTING POLICIES - Self Insurance (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Self insurance reserve towards deductible for general liability	$ 1	$ 1
Self insurance reserve towards deductible for workers compensation and employers liability	1	1
Self insurance reserve towards deductible for vehicle liability	2	2
Self insurance reserve towards deductible for health liability	0.3	0.3
Excess loss policy limit		100
Workers' Compensation Liability, Current	13.2	13.2
Accrued general insurance	0.5	0.5
Accrued health insurance	$ 2.9	2.9
Employee benefit plans
Matching contribution as a percentage of employee contributions	50.00%		100.00%
Matching contribution as a percentage of employee compensation	4.00%		4.00%
Company 401k contribution		0.1	$ 0	$ 4.2
Payroll Tax Deferral	$ 3	$ 3	$ 6
First year
Employee benefit plans
Annual vesting matching contribution as a percentage of employee compensation		25.00%
Second year
Employee benefit plans
Annual vesting matching contribution as a percentage of employee compensation		50.00%
Third year
Employee benefit plans
Annual vesting matching contribution as a percentage of employee compensation		75.00%
Fourth year
Employee benefit plans
Annual vesting matching contribution as a percentage of employee compensation		100.00%
Minimum
Class of Stock [Line Items]
Estimated exposure amount of workers compensation claims	12.2	$ 12.2
Maximum
Class of Stock [Line Items]
Estimated exposure amount of workers compensation claims	$ 14.3	$ 14.3

ACQUISITIONS AND DIVESTITURES -

ACQUISITIONS AND DIVESTITURES - Fair Value of Assets Acquired and Liabilities Assumed (Details) $ in Thousands	Dec. 03, 2021USD ($)shares	Oct. 01, 2021USD ($)sharesbbl	Aug. 02, 2021USD ($)	Jul. 09, 2021USD ($)shares	Sep. 30, 2019USD ($)	Dec. 31, 2021USD ($)shares	Dec. 31, 2019USD ($)
Less: identified assets acquired and liabilities assumed
Goodwill							$ 266,934
Bargain purchase gain						$ (18,985)
2021 Acquisitions
Consideration transferred
Common stock issued						32,123
Cash paid						34,776
Estimated earn-out liability assumed						1,058
Total consideration transferred						$ 67,957
Number of shares issued in acquisition | shares						5,713,968
HB Rentals
Consideration transferred
Cash paid	$ 1,526
Total consideration transferred	8,661
Less: identified assets acquired and liabilities assumed
Working capital	29
Property and equipment	14,091
Right-of-use assets	1,316
Long-term lease liabilities	(835)
Total identifiable net assets acquired	14,601
Bargain purchase gain	(5,940)
Fair value allocated to net assets acquired, net of bargain purchase gain	8,661
HB Rentals | Class A Common Stock
Consideration transferred
Common stock issued	$ 7,135
Number of shares issued in acquisition | shares	1,211,375
HB Rentals | Water Solutions
Consideration transferred
Common stock issued	$ 7,135
Cash paid	1,526
Total consideration transferred	$ 8,661
Number of shares issued in acquisition | shares	1,211,375
Aqua Libre and Basic
Business Acquisition [Line Items]
Water related asset, production capacity acquired | bbl		550,000
Consideration transferred
Cash paid		$ 16,394
Total consideration transferred		21,078
Less: identified assets acquired and liabilities assumed
Working capital		(506)
Property and equipment		41,000
Right-of-use assets		309
Long-term ARO		(15,810)
Long-term lease liabilities		(281)
Total identifiable net assets acquired		24,712
Bargain purchase gain		(3,634)
Fair value allocated to net assets acquired, net of bargain purchase gain		21,078
Aqua Libre and Basic | Selling, general and administrative
Business Acquisition [Line Items]
Transaction-related costs						$ 2,200
Aqua Libre and Basic | Class A Common Stock
Consideration transferred
Common stock issued		$ 4,684
Number of shares issued in acquisition | shares		902,593
Aqua Libre and Basic | Water Solutions
Consideration transferred
Common stock issued		$ 4,684
Cash paid		16,394
Total consideration transferred		$ 21,078
Number of shares issued in acquisition | shares		902,593
UltRecovery
Consideration transferred
Cash paid			$ 2,500
Estimated earn-out liability assumed			1,058
Total consideration transferred			3,558
Maximun earn-out based on revenue generated			1,600
Less: identified assets acquired and liabilities assumed
Inventory			13
Property and equipment			514
Patents and other intellectual property			3,031
Total identifiable net assets acquired			3,558
Fair value allocated to net assets acquired, net of bargain purchase gain			3,558
UltRecovery | Oilfield Chemicals
Consideration transferred
Cash paid			2,500
Estimated earn-out liability assumed			1,058
Total consideration transferred			$ 3,558
Complete Energy Services, Inc.
Business Acquisition [Line Items]
Payment of working capital				$ 200
Consideration transferred
Cash paid				14,356
Total consideration transferred				$ 34,660
Number of shares issued in acquisition | shares				3,600,000
Initial payment				$ 14,200
Less: identified assets acquired and liabilities assumed
Working capital				15,783
Property and equipment				36,761
Right-of-use assets				3,331
Other long-term assets				24
Long-term ARO				(9,800)
Long-term lease liabilities				(2,028)
Total identifiable net assets acquired				44,071
Bargain purchase gain				(9,411)
Fair value allocated to net assets acquired, net of bargain purchase gain				34,660
Complete Energy Services, Inc. | Selling, general and administrative
Business Acquisition [Line Items]
Transaction-related costs						$ 1,200
Complete Energy Services, Inc. | Class A Common Stock
Consideration transferred
Common stock issued				20,304
Total consideration transferred				$ 34,500
Number of shares issued in acquisition | shares				3,600,000
Complete Energy Services, Inc. | Water Solutions
Consideration transferred
Common stock issued				$ 20,304
Cash paid				14,356
Total consideration transferred				$ 34,660
Number of shares issued in acquisition | shares				3,600,000
Well Chemical Services Acquisition
Consideration transferred
Cash paid					$ 10,000
Total consideration transferred					10,000
Initial payment					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, net of bargain purchase gain					$ 10,000

ACQUISITIONS AND DIVESTITURES_2

ACQUISITIONS AND DIVESTITURES - Affirm and Canadian Operations Divestitures (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of sales transactions		4
Impairment of Goodwill	$ 0	$ 266,934	$ 4,400
Affirm Crane Sale | February 26, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Initial Net Proceeds			10,982
Working Capital True Up			(208)
Adjusted Net Proceeds			10,774
Gain or loss			208
Affirm Crane Sale | June 28, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Initial Net Proceeds			6,968
Adjusted Net Proceeds			6,968
Gain or loss			(1,646)
Canadian Business | March 19, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Initial Net Proceeds			4,975
Working Capital True Up			(302)
Adjusted Net Proceeds			4,673
Gain or loss			5,013
Canadian Business | Apri 1, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Initial Net Proceeds			2,242
Adjusted Net Proceeds			2,242
Gain or loss			101
Sale | Affirm Crane Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain or loss		$ 0
Number of transactions assigned for working capital		2
Reduction in goodwill			2,600
Impairment of Goodwill			4,400
Sale | Affirm and Canadian Operations Divestitures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of sales transactions		4
Net book value			$ 18,600

IMPAIRMENTS AND OTHER COSTS (De

IMPAIRMENTS AND OTHER COSTS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)facility
Exit and disposal activities
Impairment of goodwill and trademark		$ 276,016	$ 4,396
Impairment and abandonment of property and equipment		7,910	3,715
Severance Costs	$ 3,225	7,168	1,691
Yard closure costs		2,961
Lease Abandonment Costs	894	4,350	$ 2,073
Number of abandoned facilities | facility			2
Payments on restructuring	100
Water Services
Exit and disposal activities
Impairment of goodwill and trademark		186,468
Impairment and abandonment of property and equipment		3,894	$ 969
Yard closure costs		2,645
Water Infrastructure
Exit and disposal activities
Impairment of goodwill and trademark		80,466
Impairment and abandonment of property and equipment		4,016	1,804
Oilfield Chemicals
Exit and disposal activities
Impairment of goodwill and trademark		9,082
Yard closure costs		316
Other
Exit and disposal activities
Impairment of goodwill and trademark			4,396
Impairment and abandonment of property and equipment			942
Pipelines
Exit and disposal activities
Impairment and abandonment of property and equipment			1,100
layflat
Exit and disposal activities
Impairment and abandonment of property and equipment			1,000
Canadian Fixed Assets
Exit and disposal activities
Impairment and abandonment of property and equipment			900
Owned Facility
Exit and disposal activities
Impairment and abandonment of property and equipment			600
Costs of revenue
Exit and disposal activities
Yard closure costs		3,000
Costs of revenue | Water Services
Exit and disposal activities
Severance Costs		2,929
Costs of revenue | Water Infrastructure
Exit and disposal activities
Severance Costs		452
Costs of revenue | Oilfield Chemicals
Exit and disposal activities
Severance Costs		626
Selling, general and administrative
Exit and disposal activities
Severance Costs			1,700
Selling, general and administrative | Other
Exit and disposal activities
Severance Costs	3,225	3,161	1,691
Accrued Expenses and Other Current Liabilities
Exit and disposal activities
Yard closure costs		100
Accrued severance		600
Lease abandonment costs
Exit and disposal activities
Lease Abandonment Costs	894	4,350	2,073
Lease abandonment costs | Water Services
Exit and disposal activities
Lease Abandonment Costs	888	4,321	1,218
Lease abandonment costs | Water Infrastructure
Exit and disposal activities
Lease Abandonment Costs	1	51
Lease abandonment costs | Oilfield Chemicals
Exit and disposal activities
Lease Abandonment Costs		42	11
Lease abandonment costs | Other
Exit and disposal activities
Lease Abandonment Costs	$ 5	$ (64)	$ 844

REVENUE (Details)

REVENUE (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)regionsegment	Dec. 31, 2020USD ($)segmentregion	Dec. 31, 2019USD ($)segmentregion
REVENUE
Number of Reportable Segments | segment	3	3	3
Contract liability	$ 8,200	$ 8,200
Revenue	764,620	605,105	$ 1,291,589
Accommodations and rentals
REVENUE
Revenue	64,467	56,973	139,950
Accommodations and rentals | ASC 842
REVENUE
Revenue	31,400	28,400	69,000
Permian Basin
REVENUE
Revenue	371,067	278,439	610,528
Eagle Ford
REVENUE
Revenue	99,656	69,440	156,621
Haynesville/E. Texas
REVENUE
Revenue	74,797	73,116	73,658
Marcellus/Utica
REVENUE
Revenue	62,508	54,473	96,454
Rockies
REVENUE
Revenue	78,189	37,517	85,339
MidCon
REVENUE
Revenue	64,912	56,687	176,216
Bakken
REVENUE
Revenue	19,077	38,986	92,956
Eliminations and other regions
REVENUE
Revenue	$ (5,586)	$ (3,553)	$ (183)
Permian Basin, MidCon and Eagle Ford | Water Services
REVENUE
Number of revenue producing regions | region	4	4	4
Percentage of revenue	85.00%	79.00%	80.00%
Permian Basin and Bakken | Water Infrastructure
REVENUE
Number of revenue producing regions | region	3	3	3
Percentage of revenue	95.00%	97.00%	93.00%
Permian Basin and MidCon | Oilfield Chemicals
REVENUE
Number of revenue producing regions | region	3	3	3
Percentage of revenue	82.00%	87.00%	89.00%

LEASES - Description (Details)

LEASES - Description (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2020USD ($)	Dec. 31, 2021USD ($)lease	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
LEASES
Number of facility leases | lease		303
Number of subleases | lease		12
Number of finance leases | lease		6
Reduction in right- of-use assets	$ 5,700
Reduction in Lease liability	$ 5,700
Operating lease liabilities		$ 53,198	$ 60,984
Variable Lease, Cost		1,300	1,100	$ 1,600
Property tax expense		$ 800	$ 800	$ 800
Minimum
LEASES
Lessee operating lease renewal term		1 year
Maximum
LEASES
Lessee operating lease renewal term		5 years

LEASES - Financial Impact of Le

LEASES - Financial Impact of Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position
Right-of-use assets	$ 47,732	$ 52,331
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Right-of-use assets	Right-of-use assets
Finance lease assets	$ 134	$ 302
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
Operating lease liabilities	$ 13,997	$ 14,019
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Operating lease liabilities	Operating lease liabilities
Operating lease liabilities	$ 53,198	$ 60,984
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating lease liabilities	Operating lease liabilities
Finance lease liabilities	$ 113	$ 307
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Finance lease liabilities	Finance lease liabilities
Finance lease liabilities	$ 24	$ 94
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Right-of-use asset impairment	$ 0	$ 3,600	$ 600
Operating lease cost:
Operating lease cost - fixed	13,762	19,968	27,856
Lease abandonment costs	894	4,350	2,073
Short-term agreements:	54,301	44,062	93,949
Finance lease cost:
Amortization of leased assets	230	314	916
Interest on lease liabilities	10	14	32
Sublease income	1,080	1,463	1,544
Lessor income	335	350	478
Statement of cash flows
Cash paid for operating leases	19,004	22,385	30,670
Cash paid for finance leases lease interest	10	14	32
Cash paid for finance leases	$ 320	$ 264	$ 883

LEASES - Lease Term and Discoun

LEASES - Lease Term and Discount Rate (Details)	Dec. 31, 2021	Dec. 31, 2020
LEASES
Operating leases, weighted average remaining lease term	5 years 10 months 24 days	6 years 8 months 12 days
Finance leases, weighted average remaining lease term	1 year	1 year 3 months 18 days
Operating Leases, Weighted-average discount rate	4.60%	4.70%
Finance leases, Weighted average discount rate	3.40%	3.60%

LEASES - Lease Commitments (Det

LEASES - Lease Commitments (Details) $ in Thousands	Dec. 31, 2021USD ($)
Operating Leases
2022	$ 19,227
2023	14,012
2024	12,131
2025	11,010
2026	9,632
Thereafter	13,936
Total minimum lease payments	79,948
Operating lease, Less reconciling items to reconcile undiscounted cash flows to lease liabilities:
Short-term leases excluded from balance sheet	2,450
Imputed interest	10,303
Total reconciling items	12,753
Total liabilities per balance sheet	$ 67,195
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Total liabilities per balance sheet
Finance Leases
2022	$ 115
2023	20
2024	5
Total minimum lease payments	140
Finance Lease, Less reconciling items to reconcile undiscounted cash flows to lease liabilities:
Imputed interest	3
Total reconciling items	3
Total liabilities per balance sheet	137
Total
2022	19,342
2023	14,032
2024	12,136
2025	11,010
2026	9,632
Thereafter	13,936
Total minimum lease payments	80,088
Leases Total , Less reconciling items to reconcile undiscounted cash flows to lease liabilities:
Short-term leases excluded from balance sheet	2,450
Imputed interest	10,306
Total reconciling items	12,756
Total liabilities per balance sheet	67,332
2022	1,200
2023	600
2024	300
2025	300
2026	$ 200

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant components of inventory
Raw materials	$ 20,396	$ 16,701
Finished goods	24,060	16,683
Total	44,456	33,384
Inventory write-downs	239	852	$ 250
Inventory Valuation Reserves	$ 3,900	$ 3,900

PROPERTY AND EQUIPMENT (Details

PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property and equipment
Property and equipment	$ 943,515	$ 878,902
Less accumulated depreciation	(551,727)	(528,537)
Total property and equipment, net	391,788	350,365
Accumulated depreciation related to finance leases	1,100	1,100
Depreciation and amortization expense
Depreciation expense from property and equipment	81,381	89,848	$ 107,738
Amortization expense from finance lease	230	314	916
Amortization expense from intangible assets	10,639	11,661	11,900
Accretion expense from asset retirement obligations	208	(151)	115
Total depreciation and amortization	92,458	101,672	120,669
Property and Equipment Held-for-Sale and Impairments
Net loss on disposal of property and equipment	2,068	2,405	$ 7,950
Canadian Assets
Property and Equipment Held-for-Sale and Impairments
Net loss on disposal of property and equipment		100
Machinery and equipment
Property and equipment
Property and equipment	626,633	596,441
Buildings and leasehold improvements
Property and equipment
Property and equipment	108,177	93,236
Pipelines
Property and equipment
Property and equipment	72,829	72,458
Disposal wells
Property and equipment
Property and equipment	63,228	48,097
Vehicles and equipment
Property and equipment
Property and equipment	28,502	30,975
Land
Property and equipment
Property and equipment	16,873	13,497
Computer equipment and software
Property and equipment
Property and equipment	5,395	7,127
Office furniture and equipment
Property and equipment
Property and equipment	764	892
Machinery and equipment - finance lease
Property and equipment
Property and equipment	544	537
Vehicles and equipment - finance lease
Property and equipment
Property and equipment	324	475
Computer equipment and software - finance lease
Property and equipment
Property and equipment	412	356
Construction in progress
Property and equipment
Property and equipment	$ 19,834	$ 14,811

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Goodwill
Balance at the beginning of the period		$ 266,934
Impairment	$ 0	(266,934)	$ (4,400)
Balance at the end of the period			266,934
Water Services
Goodwill
Balance at the beginning of the period		186,468
Impairment		(186,468)
Balance at the end of the period			186,468
Water Infrastructure
Goodwill
Balance at the beginning of the period		80,466
Impairment		$ (80,466)
Balance at the end of the period			$ 80,466

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Value, Definite-lived		$ 136,560	$ 133,529
Accumulated Amortization, Definite-lived		(49,479)	(38,841)
Total		87,081	94,688
Gross Value, Indefinite-lived		21,391	30,473
Impairment, Indefinite-lived	$ 9,100		(9,082)
Net Value, Indefinite-lived		21,391	21,391
Intangible Assets, Gross (Excluding Goodwill)		157,951	164,002
Intangible Assets, Net (Excluding Goodwill)		108,472	116,079
Amortization of Intangible Assets		10,639	11,661	$ 11,900
Definite-lived intangible asset acquired			0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Value, Definite-lived		116,554	116,554
Accumulated Amortization, Definite-lived		(38,371)	(29,302)
Total		$ 78,183	87,252
Weighted average amortization period		8 years 8 months 12 days
Patents and other intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross Value, Definite-lived		$ 12,772	9,741
Accumulated Amortization, Definite-lived		(4,313)	(3,166)
Total		8,459	6,575
Gross Value, Indefinite-lived		$ 3,000
Weighted average amortization period		6 years 4 months 24 days
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Value, Definite-lived		$ 7,234	7,234
Accumulated Amortization, Definite-lived		(6,795)	(6,373)
Total		$ 439	861
Weighted average amortization period		2 years 3 months 18 days
Water rights
Finite-Lived Intangible Assets [Line Items]
Gross Value, Indefinite-lived		$ 7,031	7,031
Water rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Renewal term		5 years
Water rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Renewal term		10 years
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Value, Indefinite-lived		$ 14,360	23,442
Impairment, Indefinite-lived			(9,082)
Net Value, Indefinite-lived		$ 14,360	$ 14,360
Trademarks | Minimum
Finite-Lived Intangible Assets [Line Items]
Renewal term		5 years
Trademarks | Maximum
Finite-Lived Intangible Assets [Line Items]
Renewal term		10 years

GOODWILL AND OTHER INTANGIBLE_5

GOODWILL AND OTHER INTANGIBLE ASSETS - Annual Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Annual amortization of intangible assets
2022	$ 10,666
2023	10,594
2024	10,525
2025	10,362
2026	10,274
Thereafter	34,660
Total	$ 87,081	$ 94,688

DEBT (Details)

DEBT (Details) - USD ($) $ in Thousands	Nov. 01, 2017	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
DEBT
Amortization of debt issuance costs		$ 688	$ 688	$ 688
Average excess availability, less than 33% of the commitments | Base Rate Advances
DEBT
Variable interest rate (as a percent)		1.00%
Average excess availability, less than 33% of the commitments | LIBOR
DEBT
Variable interest rate (as a percent)		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%
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%
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%
Average excess availability, more than or equal to 66.67% of the commitments | LIBOR
DEBT
Variable interest rate (as a percent)		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		132,700	96,400
Senior secured credit facility
DEBT
Percentage of borrowing base allowed	35.00%
Margin (as a percent)	2.00%
Reduction in borrowing capacity		15,600	15,600
Unused portion of available borrowing		117,100
Unamortized Debt issuance Costs		$ 600	$ 1,300
Senior secured credit facility | Minimum
DEBT
Percentage of borrowing base allowed	30.00%
Variable interest rate (as a percent)		1.50%
Senior secured credit facility | Maximum
DEBT
Variable interest rate (as a percent)		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) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES
Percentage of vehicles in which certain employees at some of the facilities altered emissions controls systems	5.00%
Litigation Settlement Accrual		$ 2.6	$ 2.6
Payments for Legal Settlements	$ 4.3

EQUITY-BASED COMPENSATION (Deta

EQUITY-BASED COMPENSATION (Details) - shares	Dec. 20, 2016	Dec. 31, 2021	May 08, 2020	Nov. 01, 2017
Class A-1 Common Stock | Private Placement
EQUITY-BASED COMPENSATION
Shares issued	16,100,000
2016 plan
EQUITY-BASED COMPENSATION
Maximum number of shares		2,800,000		13,300,000
2016 plan | Maximum
EQUITY-BASED COMPENSATION
Equity options term		10 years
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 - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Equity Options
Beginning balance (in shares)	3,519,159
Granted (in shares)	0
Expired (in shares)	(1,444,943)
Ending balance (in shares)	2,074,216	3,519,159
Ending balance, exercisable (in shares)	2,074,216
Weighted-average Grant Date Value
Beginning balance (in dollars per share)	$ 8.58
Expired (in dollars per share)	6.80
Ending balance (in dollars per share)	9.82	$ 8.58
Ending balance, exercisable	9.82
Weighted-average Exercise Price
Beginning balance (in dollars per share)	16.11
Expired (in dollars per share)	15
Ending balance (in dollars per share)	16.89	$ 16.11
Ending balance, exercisable	$ 16.89
Weighted-average Remaining Contractual Term (Years)
Outstanding	4 years 4 months 24 days	3 years 3 months 18 days
Ending balance, exercisable	4 years 4 months 24 days

EQUITY-BASED COMPENSATION - E_2

EQUITY-BASED COMPENSATION - Equity Options (Details) - Equity options - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0.2	$ 4.3
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price	$ 4.10		$ 6.23

EQUITY-BASED COMPENSATION - Res

EQUITY-BASED COMPENSATION - Restricted stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
EQUITY-BASED COMPENSATION
Payments for repurchase of common stock	$ 1,206	$ 10,876	$ 18,600
Restricted Stock
EQUITY-BASED COMPENSATION
Compensation expense	7,900	7,200	$ 8,500
Unrecognized compensation expense	10,800
Payments for repurchase of common stock	$ 1,200	$ 1,500
Weighted-average remaining life	1 year 9 months 18 days
Restricted Stock | Minimum
EQUITY-BASED COMPENSATION
offering period	1 year
Restricted Stock | Maximum
EQUITY-BASED COMPENSATION
offering period	3 years
Restricted Stock Awards
Restricted stock
Beginning balance (in shares)	2,003,072
Granted (in shares)	2,154,897
Vested (in shares)	(693,582)
Forfeited (in shares)	(319,874)
Ending balance (in shares)	3,144,513	2,003,072
Grant Date Fair Value
Beginning balance (in dollars per share)	$ 6.97
Granted (in dollars per share)	6.29
Vested (in dollars per share)	7.92
Forfeited (in dollars per share)	6.41
Ending balance (in dollars per share)	$ 6.35	$ 6.97
Restricted Stock Units
Restricted stock
Beginning balance (in shares)		1,250
Granted (in shares)	0
Vested (in shares)		(625)
Forfeited (in shares)		(625)
Ending balance (in shares)			1,250
Grant Date Fair Value
Beginning balance (in dollars per share)		$ 19
Vested (in dollars per share)		20
Forfeited (in dollars per share)		$ 18
Ending balance (in dollars per share)			$ 19

EQUITY-BASED COMPENSATION - Per

EQUITY-BASED COMPENSATION - Performance share units (Details)	12 Months Ended
	Dec. 31, 2021USD ($)$ / shares	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of times shares issued for each performance share settlement | $ / shares	1
Grant date fair value of PSUs	$ 4,400,000	$ 4,400,000	$ 7,000,000
Compensation expense	1,600,000	$ (1,700,000)	$ 2,100,000
Unrecognized compensation expense	$ 3,200,000
Weighted-average remaining life	1 year 8 months 12 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	0
Percentage of Target Amount Earned	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	1.75
Return on assets Less than 9.6% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount 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 Amount Earned	50.00%
Return on assets 12% | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target Amount 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 Amount 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 5%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Target PSUs that can be earned	5.00%
Percentage of Target Amount Earned	5.00%
Adjusted EBITDA Threshold Met | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	100.00%
Failure To Meet Adjusted EBITDA Threshold | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%

EQUITY-BASED COMPENSATION - P_2

EQUITY-BASED COMPENSATION - Performance share units outstanding (Details) - Performance share units	12 Months Ended
	Dec. 31, 2021shares
Performance share units
Beginning balance (in shares)	1,763,909
Target shares granted	689,551
Target shares forfeited	(247,856)
Ending balance (in shares)	2,205,604

EQUITY-BASED COMPENSATION - Emp

EQUITY-BASED COMPENSATION - Employee Stock Purchase Plan (ESPP) (Details) - ESPP	12 Months Ended
	Dec. 31, 2021USD ($)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	$ 58,000
Shares issued | shares	10,518
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 ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in paid-in capital	$ 1,206,000	$ 10,876,000	$ 18,600,000
2016 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased in open market	0	1,989,440
Number of shares repurchased with employee minimum tax withholding requirements	199,974	210,384
Decrease in paid-in capital	$ 1,200,000
Class A Common Stock | 2016 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in Class A common stock	$ 2,000

FAIR VALUE MEASUREMENT (Details

FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers into Level3		$ 0	$ 0	$ 0
Transfers out of Level3		0	0	0
Impairment of Goodwill	$ 0		266,934	4,400
Impairment of property and equipment			7,910	3,715
Recurring | March 31 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		1,546
Recurring | June 30 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		2,208
Recurring | September 30 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		1,717	1,768
Recurring | December 31 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		75	3,377
Nonrecurring | March 31
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment				519
Impairment of Goodwill			266,934	4,396
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	4,396
Trademark			23,442
Property and equipment			3,360	2,865
Nonrecurring | June 30
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property and equipment			4,726	374
Nonrecurring | June 30 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment			4,726	2,760
Nonrecurring | September 30
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property and equipment				49
Nonrecurring | September 30 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment				87
Nonrecurring | December 31
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property and equipment				2,773
Nonrecurring | December 31 | Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment				5,328
Level 1 | Recurring | March 31 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		1,546
Level 1 | Recurring | June 30 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		2,208
Level 1 | Recurring | September 30 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		1,717
Level 1 | Recurring | December 31 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		$ 75	3,377
Level 2 | Recurring | September 30 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments			1,768
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	2,346
Level 3 | Nonrecurring | June 30 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment				2,386
Level 3 | Nonrecurring | September 30 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment				38
Level 3 | Nonrecurring | December 31 | Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment				$ 2,555

FAIR VALUE MEASUREMENT - Nonmon

FAIR VALUE MEASUREMENT - Nonmonetary transaction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange for accounts receivable	$ 1,600
Sale of securities	2,300
Prepaid Expenses and Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
common stock and related securities prepaid expenses	75	$ 3,377
Other Nonoperating Income (Expense)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains/losses	2,000	$ 1,800
Realized gains/losses	$ 1,000

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
RELATED PARTY TRANSACTIONS
Sales to related parties	$ 1.1	$ 3.9	$ 16.8
Purchases from related party vendors	$ 7	7.3	18.8
Minimum
RELATED PARTY TRANSACTIONS
Beneficial ownership (as a percent)	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	$ 0.2	0.5	3
Inventory and consumables
RELATED PARTY TRANSACTIONS
Purchases from related party vendors		0.1	0.2
Rent of certain equipment or other services
RELATED PARTY TRANSACTIONS
Purchases from related party vendors	5.8	6.3	14.3
Management, consulting and other services
RELATED PARTY TRANSACTIONS
Purchases from related party vendors	1	0.4	$ 1.3
Notes receivable with affiliates
RELATED PARTY TRANSACTIONS
Investment in note receivable	$ 1.1	$ 3

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	Mar. 27, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
INCOME TAXES
Effective Income tax (as percent)		0.30%	0.40%	32.00%
Statutory tax rate (as a percent)		21.00%	21.00%	21.00%
Income tax (expense) benefit	$ 500	$ 147	$ (1,476)	$ 1,949
Current tax (benefit) expense
Federal income tax (benefit) expense		126	(941)	696
State and local income tax (benefit) expense		(262)	(439)	1,034
Total current (benefit) expense		(136)	(1,380)	1,730
Deferred tax (benefit) expense
Federal income tax (benefit) expense		56	(105)	49
State and local income tax expense (benefit)		227	9	170
Total deferred (benefit) expense		283	(96)	219
Total income tax (benefit) expense	500	147	(1,476)	1,949
Tax (benefit) expense attributable to controlling interests		124	(1,246)	1,488
Income tax (benefit) expense attributable to noncontrolling interests		23	(230)	461
Provision calculated at federal statutory income tax rate:
(Loss) income before equity in losses of unconsolidated entities and taxes		(49,659)	(403,208)	6,085
Equity in losses of unconsolidated entities		(279)
(Loss) income before taxes		$ (49,938)	$ (403,208)	$ 6,085
Statutory rate		21.00%	21.00%	21.00%
Income tax (benefit) expense computed at statutory rate		$ (10,487)	$ (84,674)	$ 1,278
Less: noncontrolling interests		1,651	13,272	(284)
Income tax (benefit) expense attributable to controlling interests		(8,836)	(71,402)	994
State and local income taxes, net of federal benefit		(30)	(430)	884
State rate change		(2,787)	179	1,359
Change in subsidiary tax status		679	(409)	587
Deferred tax adjustments		4,804
CARES Act NOL carryback benefit			(459)
Change in valuation allowance		6,119	71,275	(3,192)
Deferred adjustment due to restructuring				856
Other		175
Income tax (benefit) expense attributable to controlling interests		124	(1,246)	1,488
Income tax (benefit) expense attributable to noncontrolling interests		23	(230)	461
Total income tax (benefit) expense	$ 500	$ 147	$ (1,476)	$ 1,949

INCOME TAXES - Deferred tax ass

INCOME TAXES - Deferred tax assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Outside basis difference in SES Holdings	$ 62,110	$ 78,918
Federal net operating loss carryforward	92,366	69,601
Federal net operating loss carryforward expires beginning in 2031	133,800
Federal net operating loss carry forward with no expiration	248,600
State NOLs	10,200
Foreign NOLs	6,800
Credits and other carryforwards	4,316	4,111
Other	43	541
Total deferred tax assets before valuation allowance	158,835	153,171
Valuation allowance	(158,779)	(152,659)
Total deferred tax assets	56	512
Deferred tax liabilities
Property and equipment	530	718
Other	56	41
Total deferred tax liabilities	586	759
Net deferred tax (liabilities)	$ (530)	$ (247)

INCOME TAXES - Valuation allowa

INCOME TAXES - Valuation allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in valuation allowance
Change during the year	$ 6.1
Net operating loss carryforward	$ 382.4
Statutory rate	21.00%	21.00%	21.00%
Liability or expense	$ 0	$ 0

NONCONTROLLING INTERESTS (Detai

NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
NONCONTROLLING INTERESTS
Noncontrolling interests attributable to joint ventures formed for water-related services	$ 1,091	$ 2,002
Noncontrolling interests attributable to holders of Class B Common Stock	101,987	110,819
Total noncontrolling interests	$ 103,078	$ 112,821

NONCONTROLLING INTERESTS - Effe

NONCONTROLLING INTERESTS - Effect of Changes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effects of changes in noncontrolling interests on equity
Net (loss) income attributable to Select Energy Services, Inc.	$ (42,225)	$ (338,684)	$ 2,784
Transfers from (to) noncontrolling interests:
Noncontrolling interest in subsidiary	900	200
Increase in additional paid-in capital as a result of issuing shares for a business combination	532
Increase in additional paid-in capital as a result of stock option exercises			54
Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures	1,847	1,874	3,614
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	(19)	(1,416)	(3,362)
Increase in additional paid-in capital as a result of exchanges of SES Holdings LLC Units (an equivalent number of shares of Class B Common Stock) for shares of Class A Common Stock			107,062
Increase in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued	1	7	42
Change to equity from net (loss) income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests	$ (39,864)	$ (338,218)	$ 110,198

(LOSS) EARNINGS PER SHARE (Deta

(LOSS) EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Calculation of basic and diluted earnings per share:
Antidilutive shares	2,074,216	3,519,159
Net (loss) income	$ (50,085)	$ (401,732)	$ 4,136
Net (loss) income attributable to noncontrolling interests	7,860	63,048	(1,352)
Net (loss) income attributable to Select Energy Services, Inc.	(42,225)	(338,684)	2,784
Net (loss) income attributable to Select Energy Services, Inc. - diluted	(42,225)	(338,684)	2,794
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of performance share units			2
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of restricted stock			7
Add: Reallocation of net loss attributable to noncontrolling interests for the dilutive effect of stock options			1
Class A Common Stock
Calculation of basic and diluted earnings per share:
Net (loss) income attributable to Select Energy Services, Inc.	(42,225)	(338,684)	2,784
Net (loss) income attributable to Select Energy Services, Inc. - diluted	$ (42,225)	$ (338,684)	$ 2,794
Weighted-average shares of common stock outstanding - basic	87,275,467	85,158,764	80,176,323
Weighted-average shares of common stock outstanding - diluted	87,275,467	85,158,764	80,671,329
Earnings (loss) per share, Basic (in dollars per share)	$ (0.48)	$ (3.98)	$ 0.03
Earnings (loss) per share, Diluted (in dollars per share)	$ (0.48)	$ (3.98)	$ 0.03
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of performance share units			$ 2
Add: Reallocation of net income attributable to noncontrolling interests for the dilutive effect of restricted stock			7
Add: Reallocation of net loss attributable to noncontrolling interests for the dilutive effect of stock options			$ 1
Dilutive effect of restricted stock			373,366
Dilutive effect of performance share units			80,979
Dilutive effect of stock options			40,215
Dilutive effect of ESPP			446
Class B Common Stock
Calculation of basic and diluted earnings per share:
Weighted-average shares of common stock outstanding - basic	16,221,101	16,221,101	23,806,646
Weighted-average shares of common stock outstanding - diluted	16,221,101	16,221,101	23,806,646

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)segment	Dec. 31, 2020USD ($)segment	Dec. 31, 2019USD ($)segment
SEGMENT INFORMATION
Number of reportable segments | segment	3	3	3
Segment information
Revenue	$ 764,620	$ 605,105	$ 1,291,589
(Loss) Income before taxes	(49,659)	(403,208)	6,085
Depreciation and Amortization	92,458	101,672	120,669
Capital Expenditures	46,381	16,500	102,705
(Loss) income from operations	(65,540)	(394,777)	23,074
Other income (expense), net	673	(3,519)	(2,948)
Bargain purchase gain	18,985
Operating segment | Water Services
Segment information
Revenue	399,709	322,461	773,946
(Loss) Income before taxes	(26,219)	(250,779)	51,185
Depreciation and Amortization	53,777	61,758	80,664
Capital Expenditures	18,296	2,161	37,692
Operating segment | Water Infrastructure
Segment information
Revenue	155,323	125,710	221,661
(Loss) Income before taxes	2,689	(96,290)	15,103
Depreciation and Amortization	26,957	27,599	25,665
Capital Expenditures	22,043	6,852	53,839
Operating segment | Oilfield Chemicals
Segment information
Revenue	216,410	160,825	268,963
(Loss) Income before taxes	1,984	(13,365)	17,942
Depreciation and Amortization	9,294	9,443	8,766
Capital Expenditures	5,010	7,157	11,110
Operating segment | Other.
Segment information
Revenue			33,365
(Loss) Income before taxes	(19)	(733)	(8,066)
Depreciation and Amortization			1,714
Capital Expenditures	1,032	330	64
Elimination
Segment information
Revenue	(6,822)	(3,891)	(6,346)
Corporate
Segment information
(Loss) Income before taxes	(43,975)	(33,610)	(53,090)
Depreciation and Amortization	2,430	2,872	3,860
Material reconciling items
Segment information
(Loss) income from operations	(21,565)	(361,167)	76,164
Interest expense, net	(1,711)	(2,136)	(2,688)
Other income (expense), net	$ (1,393)	$ (6,295)	$ (14,301)

SEGMENT INFORMATION - Total Ass

SEGMENT INFORMATION - Total Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Assets	$ 950,192	$ 875,359
Operating segment | Water Services
Segment Reporting Information [Line Items]
Assets	533,071	515,856
Operating segment | Water Infrastructure
Segment Reporting Information [Line Items]
Assets	229,803	204,995
Operating segment | Oilfield Chemicals
Segment Reporting Information [Line Items]
Assets	180,732	147,612
Operating segment | Other.
Segment Reporting Information [Line Items]
Assets	$ 6,586	$ 6,896

SEGMENT INFORMATION - Revenue b

SEGMENT INFORMATION - Revenue by product (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 764,620	$ 605,105	$ 1,291,589
Oilfield chemicals
Segment Reporting Information [Line Items]
Revenue	216,410	160,825	268,963
Water transfer
Segment Reporting Information [Line Items]
Revenue	175,153	146,728	355,535
Pipeline logistics and disposal
Segment Reporting Information [Line Items]
Revenue	108,629	91,971	101,145
Accommodations and rentals
Segment Reporting Information [Line Items]
Revenue	64,467	56,973	139,950
Accommodations and rentals | ASC 842
Segment Reporting Information [Line Items]
Revenue	31,400	28,400	69,000
Flowback and well testing
Segment Reporting Information [Line Items]
Revenue	75,610	61,839	208,572
Fluid hauling
Segment Reporting Information [Line Items]
Revenue	85,355	58,368	73,999
Water Sourcing
Segment Reporting Information [Line Items]
Revenue	46,695	33,739	120,517
Eliminations and other service lines
Segment Reporting Information [Line Items]
Revenue	$ (7,699)	$ (5,338)	$ 22,908

SEGMENT INFORMATION - Other dis

SEGMENT INFORMATION - Other disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Revenue	$ 764,620	$ 605,105	$ 1,291,589
Geographic concentration risk | UNITED STATES | Revenue
Concentration Risk [Line Items]
Revenue	$ 764,600	$ 605,100	$ 1,283,400
Concentration risk (as a percent)	100.00%	100.00%	99.40%
Geographic concentration risk | UNITED STATES | Long Lived Asset
Concentration Risk [Line Items]
Long-lived assets	$ 391,800	$ 350,400	$ 452,400
Concentration risk (as a percent)	100.00%	100.00%	99.80%
Geographic concentration risk | CANADA | Revenue
Concentration Risk [Line Items]
Revenue			$ 8,200
Concentration risk (as a percent)			0.60%
Geographic concentration risk | CANADA | Long Lived Asset
Concentration Risk [Line Items]
Long-lived assets	$ 0	$ 0	$ 900
Concentration risk (as a percent)			0.20%

SUBSEQUENT EVENTS (Details)

SUBSEQUENT EVENTS (Details) - Subsequent Event - Nuverra shares in Thousands, $ in Millions	Feb. 23, 2022USD ($)shares
Subsequent Events
Cash payment of acquiree's debt | $	$ 19
Class A Common Stock
Subsequent Events
Number of shares issued in acquisition | shares	4,150