v3.26.1
SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting          
Net sales $ 622,880 $ 587,434 $ 1,123,317 $ 1,042,681  
Operating income/(loss) 93,599 88,141 141,684 132,242  
Cost of sales 392,275 375,608 717,743 666,952  
Selling, general, and administrative expenses 132,088 123,521 255,100 243,164  
Restructuring expense 406 164 4,278 323  
Litigation Settlement, Loss (4,512) 0 (4,512) 0  
Interest Expense (3,524) (2,805) (5,835) (4,604)  
Other income/(expense), net 1,345 (164) 971 679  
Foreign Currency Transaction Gain (Loss), before Tax (2,497) (4,548) (2,122) (5,841)  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 88,923 80,624 134,698 122,476  
Depreciation and amortization 17,400 15,800 33,895 30,203  
Capital Expenditures Incurred In Year, Paid and Not Paid 10,800 12,300 20,400 18,400  
Total assets 2,150,732 2,017,900 2,150,732 2,017,900 $ 1,944,385
Operating Segments          
Segment Reporting          
Net sales 659,800 618,300 1,200,500 1,114,300  
Intersegment Sales          
Segment Reporting          
Net sales 36,900 30,900 77,200 71,600  
Operating income/(loss) (100) 1,100 (4,300) (3,000)  
Corporate And Eliminations          
Segment Reporting          
Depreciation and amortization 800 800 1,700 1,600  
Capital Expenditures Incurred In Year, Paid and Not Paid 100 500 600 900  
Total assets 84,900 67,600 84,900 67,600  
Operating Segments Excluding Intercompany          
Segment Reporting          
Net sales 622,900 587,400 1,123,300 1,042,700  
Segment Reporting, Reconciling Item, Corporate Nonsegment          
Segment Reporting          
Operating income/(loss) 112,800 107,000 184,400 174,500  
Selling, general, and administrative expenses (19,100) (20,000) (38,500) (39,300)  
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment          
Segment Reporting          
Depreciation and amortization 16,600 15,000 32,200 28,600  
Capital Expenditures Incurred In Year, Paid and Not Paid 10,700 11,800 19,800 17,500  
Total assets 2,065,800 1,950,300 2,065,800 1,950,300  
Consolidated          
Segment Reporting          
Net sales (36,900) (30,900) (77,200) (71,600)  
Water Systems | Operating Segments          
Segment Reporting          
Net sales 358,500 340,800 676,600 628,100  
Operating income/(loss) 65,200 61,800 109,700 105,300  
Cost of sales 230,700 222,900 445,000 414,100  
Selling, general, and administrative expenses 62,200 56,000 117,600 108,600  
Restructuring expense 400 100 4,300 100  
Litigation Settlement, Loss 0   0    
Depreciation and amortization 12,900 11,600 25,200 21,800  
Capital Expenditures Incurred In Year, Paid and Not Paid 7,400 10,200 12,600 13,400  
Total assets 1,332,500 1,282,100 1,332,500 1,282,100  
Water Systems | Intersegment Sales          
Segment Reporting          
Net sales 36,900 30,900 77,200 71,600  
Water Systems | Operating Segments Excluding Intercompany          
Segment Reporting          
Net sales 321,600 309,900 599,400 556,500  
Water Systems | United States & Canada          
Segment Reporting          
Net sales 183,100 172,900 330,100 307,900  
Water Systems | United States & Canada | Intersegment Sales          
Segment Reporting          
Net sales 36,900 30,900 77,200 71,600  
Water Systems | Latin America          
Segment Reporting          
Net sales 52,600 52,800 102,500 92,300  
Water Systems | EMEA          
Segment Reporting          
Net sales 56,300 55,700 112,100 107,200  
Water Systems | Asia Pacific          
Segment Reporting          
Net sales 29,600 28,500 54,700 49,100  
Distribution | Operating Segments          
Segment Reporting          
Net sales 221,100 200,000 372,000 341,900  
Operating income/(loss) 19,700 16,100 22,700 18,200  
Cost of sales 161,500 146,600 271,400 249,000  
Selling, general, and administrative expenses 39,900 37,300 77,900 74,500  
Restructuring expense 0 0 0 200  
Litigation Settlement, Loss 0   0    
Depreciation and amortization 2,600 2,300 4,900 4,700  
Capital Expenditures Incurred In Year, Paid and Not Paid 1,900 1,400 5,600 3,100  
Total assets 458,800 399,000 458,800 399,000  
Distribution | Intersegment Sales          
Segment Reporting          
Net sales 0 0 0 0  
Distribution | Operating Segments Excluding Intercompany          
Segment Reporting          
Net sales 221,100 200,000 372,000 341,900  
Distribution | United States & Canada          
Segment Reporting          
Net sales 221,100 200,000 372,000 341,900  
Distribution | United States & Canada | Intersegment Sales          
Segment Reporting          
Net sales 0 0 0 0  
Energy Systems | Operating Segments          
Segment Reporting          
Net sales 80,200 77,500 151,900 144,300  
Operating income/(loss) 27,900 29,100 52,000 51,000  
Cost of sales 36,900 38,200 74,200 72,600  
Selling, general, and administrative expenses 10,900 10,200 21,200 20,700  
Restructuring expense 0 0 0 0  
Litigation Settlement, Loss 4,500   4,500    
Depreciation and amortization 1,100 1,100 2,100 2,100  
Capital Expenditures Incurred In Year, Paid and Not Paid 1,400 200 1,600 1,000  
Total assets 274,500 269,200 274,500 269,200  
Energy Systems | Intersegment Sales          
Segment Reporting          
Net sales 0 0 0 0  
Energy Systems | Operating Segments Excluding Intercompany          
Segment Reporting          
Net sales 80,200 77,500 151,900 144,300  
Energy Systems | United States & Canada          
Segment Reporting          
Net sales 61,200 60,500 114,200 112,300  
Energy Systems | All Other          
Segment Reporting          
Net sales 19,000 17,000 37,700 32,000  
Consolidated          
Segment Reporting          
Net sales 622,900 587,400 1,123,300 1,042,700  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 88,900 $ 80,600 $ 134,700 $ 122,500