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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2026
GOODWILL AND OTHER INTANGIBLE ASSETS |
Schedule of changes in the carrying amounts of goodwill by reportable segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Water | ​ | Water | ​ | ​ | ​
​ | ​ ​ ​ | Infrastructure | ​ ​ ​ | Services | ​ ​ ​ | Total
​ | ​ | (in thousands)
Balance as of December 31, 2025 | ​ | $ | 47,047 | ​ | $ | 1,438 | ​ | $ | 48,485
Additions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance as of June 30, 2026 | ​ | $ | 47,047 | ​ | $ | 1,438 | ​ | $ | 48,485
Summary of components of other intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of June 30, 2026 | ​ | As of December 31, 2025
​ | ​ ​ ​ | Gross | ​ ​ ​ | Accumulated | ​ ​ ​ | Net | ​ ​ ​ | Gross | ​ | Accumulated | ​ ​ ​ | Net
​ | ​ | Value | ​ | Amortization | ​ | Value | ​ | Value | ​ | Amortization | ​ | Value
​ | ​ | (in thousands) | ​ | (in thousands)
Definite-lived | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer relationships | ​ | $ | 187,230 | ​ | $ | (99,314) | ​ | $ | 87,916 | ​ | $ | 187,230 | ​ | $ | (91,596) | ​ | $ | 95,634
Patents and other intellectual property | ​ | ​ | 14,272 | ​ | ​ | (10,829) | ​ | ​ | 3,443 | ​ | ​ | 14,272 | ​ | ​ | (10,060) | ​ | ​ | 4,212
Water rights | ​ | ​ | 1,925 | ​ | ​ | (951) | ​ | ​ | 974 | ​ |  | 1,750 | ​ |  | (673) | ​ |  | 1,077
Total definite-lived | ​ | ​ | 203,427 | ​ | ​ | (111,094) | ​ | ​ | 92,333 | ​ | ​ | 203,252 | ​ | ​ | (102,329) | ​ | ​ | 100,923
Indefinite-lived | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Water rights | ​ | ​ | 15,705 | ​ | ​ | — | ​ | ​ | 15,705 | ​ | ​ | 5,281 | ​ | ​ | — | ​ | ​ | 5,281
Total indefinite-lived | ​ | ​ | 15,705 | ​ | ​ | — | ​ | ​ | 15,705 | ​ | ​ | 5,281 | ​ | ​ | — | ​ | ​ | 5,281
Total other intangible assets, net | ​ | $ | 219,132 | ​ | $ | (111,094) | ​ | $ | 108,038 | ​ | $ | 208,533 | ​ | $ | (102,329) | ​ | $ | 106,204
Summary of future estimated amortization expense for other intangible assets | ​
​ | ​ | ​ | ​
​ | ​ ​ ​ | Amount
​ | ​ | (in thousands)
Remainder of 2026 | ​ | $ | 8,677
2027 | ​ |  | 16,940
2028 | ​ |  | 14,672
2029 | ​ |  | 14,131
2030 | ​ |  | 11,742
Thereafter | ​ | ​ | 26,171
Total | ​ | $ | 92,333
​

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