SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Net sales	$ 2,065,133	$ 2,043,711	$ 1,661,865
Operating income (loss)	262,441	257,189	189,193
Total assets	1,728,122	1,694,201	1,575,200
Depreciation	35,100	33,100	30,200
Amortization	17,100	17,200	14,400
Capital Expenditures Incurred In Year, Paid And Not Paid	43,200	41,100	30,100
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	865,600	829,300	842,900
United States
Segment Reporting Information
Net sales	1,441,600	1,414,100	1,075,700
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	625,300	601,700	604,500
Foreign
Segment Reporting Information
Net sales	623,500	629,600	586,200
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	240,300	227,600	238,400
Operating Segments | Water Systems
Segment Reporting Information
Net sales	1,203,700	1,157,500	963,600
Operating income (loss)	196,600	172,300	139,100
Total assets	1,044,400	1,017,500	894,400
Depreciation	22,100	20,400	19,800
Amortization	14,700	14,700	11,900
Capital Expenditures Incurred In Year, Paid And Not Paid	28,600	23,400	19,400
Operating Segments | Distribution [Member]
Segment Reporting Information
Net sales	673,300	668,100	497,600
Operating income (loss)	34,300	54,500	35,900
Total assets	365,600	360,400	363,000
Depreciation	6,800	6,100	4,400
Amortization	800	800	700
Capital Expenditures Incurred In Year, Paid And Not Paid	9,300	13,400	6,500
Operating Segments | Fueling Systems
Segment Reporting Information
Net sales	296,500	334,100	289,100
Operating income (loss)	92,700	96,800	79,500
Total assets	256,400	269,100	273,600
Depreciation	2,600	2,500	2,200
Amortization	1,600	1,700	1,800
Capital Expenditures Incurred In Year, Paid And Not Paid	3,000	2,700	3,000
Operating Segments | United States & Canada | Water Systems
Segment Reporting Information
Net sales	636,000	596,900	460,800
Operating Segments | United States & Canada | Distribution [Member]
Segment Reporting Information
Net sales	673,300	668,100	497,600
Operating Segments | United States & Canada | Fueling Systems
Segment Reporting Information
Net sales	220,900	242,600	198,500
Operating Segments | Latin America | Water Systems
Segment Reporting Information
Net sales	174,200	159,300	139,500
Operating Segments | EMEA | Water Systems
Segment Reporting Information
Net sales	198,300	192,800	189,800
Operating Segments | Asia Pacific | Water Systems
Segment Reporting Information
Net sales	86,800	92,500	85,100
Operating Segments | Other | Fueling Systems
Segment Reporting Information
Net sales	75,600	91,500	90,600
Intersegment Sales | Water Systems
Segment Reporting Information
Net sales	108,400	116,000	88,400
Intersegment Sales | Distribution [Member]
Segment Reporting Information
Net sales	0	0	0
Intersegment Sales | Fueling Systems
Segment Reporting Information
Net sales	0	0	0
Intersegment Eliminations/Other
Segment Reporting Information
Net sales	(108,400)	(116,000)	(88,400)
Operating income (loss)	(61,200)	(66,400)	(65,300)
Intersegment Eliminations/Other | Intersegment Eliminations/Other
Segment Reporting Information
Total assets	61,700	47,200	44,200
Depreciation	3,600	4,100	3,800
Amortization	0	0	0
Capital Expenditures Incurred In Year, Paid And Not Paid	$ 2,300	$ 1,600	$ 1,200