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SEGMENT INFORMATION - Total Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
SEGMENT INFORMATION
Total assets	$ 1,787,741	$ 1,595,612
Operating segment | Water Infrastructure
SEGMENT INFORMATION
Total assets	1,046,086	929,789
Operating segment | Water Services
SEGMENT INFORMATION
Total assets	461,659	435,761
Operating segment | Chemical Technologies
SEGMENT INFORMATION
Total assets	169,158	148,773
Operating segment | Other
SEGMENT INFORMATION
Total assets	$ 110,838	$ 81,289

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