| Schedule of changes in the carrying amounts of goodwill by reportable segment |
| | | | | | | | | | | | | | Water | | Water | | | | | | | Infrastructure | | Services | | Total | | | | | (in thousands) | Balance as of December 31, 2024 | | | $ | 16,777 | | $ | 1,438 | | $ | 18,215 | Additions | | | | — | | | — | | | — | Balance as of June 30, 2025 | | | $ | 16,777 | | $ | 1,438 | | $ | 18,215 |
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| Summary of components of other intangible assets |
| | | | | | | | | | | | | | | | | | | | | As of June 30, 2025 | | As of December 31, 2024 | | | Gross | | Accumulated | | Net | | Gross | | Accumulated | | Net | | | Value | | Amortization | | Value | | Value | | Amortization | | Value | | | | (in thousands) | | (in thousands) | Definite-lived | | | | | | | | | | | | | | | | | | | Customer relationships | | $ | 187,230 | | $ | (83,880) | | $ | 103,350 | | $ | 187,706 | | $ | (76,638) | | $ | 111,068 | Patents and other intellectual property | | | 14,272 | | | (9,290) | | | 4,982 | | | 14,272 | | | (8,521) | | | 5,751 | Water rights | | | 1,750 | | | (404) | | | 1,346 | | | 3,125 | | | (1,510) | | | 1,615 | Total definite-lived | | | 203,252 | | | (93,574) | | | 109,678 | | | 205,103 | | | (86,669) | | | 118,434 | Indefinite-lived | | | | | | | | | | | | | | | | | | | Water rights | | | 5,281 | | | — | | | 5,281 | | | 5,281 | | | — | | | 5,281 | Total indefinite-lived | | | 5,281 | | | — | | | 5,281 | | | 5,281 | | | — | | | 5,281 | Total other intangible assets, net | | $ | 208,533 | | $ | (93,574) | | $ | 114,959 | | $ | 210,384 | | $ | (86,669) | | $ | 123,715 |
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