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NONCONTROLLING INTERESTS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
NONCONTROLLING INTERESTS |
Schedule of Non Controlling Interests Categories | ​
​ | ​ | ​ | ​ | ​ | ​
​ | As of December 31
​ | 2020 |  | 2019
​ | (in thousands)
Noncontrolling interests attributable to joint ventures formed for water-related services | $ | 2,002 |  | $ | 2,674
Noncontrolling interests attributable to holders of Class B Common Stock | ​ | 110,819 |  |  | 172,961
Total noncontrolling interests | $ | 112,821 |  | $ | 175,635
Summary of the effects of changes in noncontrolling interests | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | For the year ended December 31,
​ |  | ​ | 2020 |  | 2019 |  | 2018
​ | ​ | ​ | (in thousands)
Net (loss) income attributable to Select Energy Services, Inc. | ​ | ​ | $ | (338,684) |  | $ | 2,784 |  | $ | 36,512
Transfers from (to) noncontrolling interests: | ​ | ​ | ​ | ​ |  |  | ​ |  |  | ​
Increase in additional paid-in capital as a result of stock option exercises | ​ | ​ |  | — |  |  | 54 |  |  | 374
Increase in additional paid-in capital as a result of restricted stock issuance, net of forfeitures | ​ | ​ |  | 1,874 |  |  | 3,614 |  |  | 1,942
Increase in additional paid-in capital as a result of issuance of common stock due to vesting of restricted stock units | ​ | ​ | ​ | 1 | ​ | ​ | 4 | ​ | ​ | 104
Decrease in additional paid-in capital as a result of the repurchase of SES Holdings LLC Units | ​ | ​ |  | (1,416) |  |  | (3,362) |  |  | (576)
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 | ​ | ​ | 146,865
Increase in additional paid-in capital as a result of the Employee Stock Purchase Plan shares issued | ​ | ​ | ​ | 7 | ​ | ​ | 42 | ​ | ​ | 15
Change to equity from net (loss) income attributable to Select Energy Services, Inc. and transfers from noncontrolling interests | ​ | ​ | $ | (338,218) |  | $ | 110,198 |  | $ | 185,236

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