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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2019
GOODWILL AND OTHER INTANGIBLE ASSETS. |
Schedule of changes in the carrying amounts of goodwill by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Oilfield | ​ | Water | ​ | Wellsite | ​ | Water | ​ | Water | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Chemicals | ​ | Solutions | ​ | Services | ​ | Services | ​ | Infrastructure | ​ | Other | ​ | Total
​ | ​ | (in thousands)
Balance as of December 31, 2017 | ​ | $ | 15,637 | ​ | $ | 245,542 | ​ | $ | 12,242 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 273,421
Additions | ​ | ​ | — | ​ | ​ | 982 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 982
Impairment | ​ | ​ | (12,652) | ​ | ​ | — | ​ | ​ | (5,242) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (17,894)
Measurement period adjustments | ​ |  | (2,985) | ​ |  | 20,277 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 17,292
Balance as of December 31, 2018 | ​ | ​ | — | ​ | ​ | 266,801 | ​ | ​ | 7,000 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 273,801
Resegmentation | ​ |  | — | ​ |  | (266,801) | ​ |  | (7,000) | ​ |  | 186,335 | ​ |  | 80,466 | ​ |  | 7,000 | ​ |  | —
Measurement period adjustments(1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 133 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 133
Affirm crane business divestiture | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ | ​ | — | ​ | ​ | (2,604) | ​ |  | (2,604)
Affirm impairment | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4,396) | ​ | ​ | (4,396)
Balance as of June 30, 2019 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 186,468 | ​ | $ | 80,466 | ​ | $ | — | ​ | $ | 266,934
| (1) | 2019 measurement period adjustment related to the Pro Well working capital settlement. See Note 3.
Summary of components of other intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of June 30, 2019 | ​ | As of December 31, 2018
​ |  | Gross |  | Accumulated |  | Net |  | Gross |  | Accumulated |  | Net
​ | ​ | Value | ​ | Amortization | ​ | Value | ​ | Value | ​ | Amortization | ​ | Value
​ | ​ | (in thousands) | ​ | (in thousands)
Definite-lived | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer relationships |  | $ | 116,078 |  | $ | 15,723 |  | $ | 100,355 |  | $ | 171,245 |  | $ | 66,402 |  | $ | 104,843
Patents | ​ | ​ | 10,110 | ​ | ​ | 1,918 | ​ | ​ | 8,192 | ​ | ​ | 10,110 | ​ | ​ | 1,417 | ​ | ​ | 8,693
Other | ​ | ​ | 7,516 | ​ | ​ | 4,098 | ​ | ​ | 3,418 | ​ |  | 7,234 | ​ |  | 2,866 | ​ |  | 4,368
Total definite-lived | ​ | ​ | 133,704 | ​ | ​ | 21,739 | ​ | ​ | 111,965 | ​ | ​ | 188,589 | ​ | ​ | 70,685 | ​ | ​ | 117,904
Indefinite-lived | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Water rights | ​ | ​ | 7,031 | ​ | ​ | — | ​ | ​ | 7,031 | ​ | ​ | 7,031 | ​ | ​ | — | ​ | ​ | 7,031
Trademarks | ​ | ​ | 23,442 | ​ | ​ | — | ​ | ​ | 23,442 | ​ | ​ | 23,442 | ​ | ​ | — | ​ | ​ | 23,442
Total indefinite-lived | ​ | ​ | 30,473 | ​ | ​ | — | ​ | ​ | 30,473 | ​ | ​ | 30,473 | ​ | ​ | — | ​ | ​ | 30,473
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total other intangible assets, net | ​ | $ | 164,177 | ​ | $ | 21,739 | ​ | $ | 142,438 | ​ | $ | 219,062 | ​ | $ | 70,685 | ​ | $ | 148,377
Summary of future estimated amortization expense for other intangible assets | ​
​ | ​ | ​ | ​
​ |  | Amount
​ | ​ | (in thousands)
Remainder of 2019 | ​ | $ | 5,927
2020 | ​ |  | 11,561
2021 | ​ |  | 10,378
2022 | ​ |  | 10,163
2023 | ​ |  | 10,092
Thereafter | ​ | ​ | 63,844
​ | ​ | $ | 111,965
​

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