SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Net sales	$ 2,043,711	$ 1,661,865	$ 1,247,331
Operating income (loss)	257,189	189,193	130,511
Total assets	1,694,201	1,575,165	1,272,300
Depreciation	33,100	30,200	27,100
Amortization	17,200	14,400	9,400
Capital Expenditures Incurred In Year, Paid And Not Paid	41,100	30,100	22,900
Long-lived assets	829,300	842,900	644,200
United States
Segment Reporting Information
Net sales	1,414,100	1,075,700	760,600
Long-lived assets	601,700	604,500	405,900
Foreign
Segment Reporting Information
Net sales	629,600	586,200	486,700
Long-lived assets	227,600	238,400	238,300
Operating Segments | Water Systems
Segment Reporting Information
Net sales	1,157,500	963,600	734,700
Operating income (loss)	172,300	139,100	114,400
Total assets	1,017,500	894,400	645,900
Depreciation	20,400	19,800	18,700
Amortization	14,700	11,900	6,900
Capital Expenditures Incurred In Year, Paid And Not Paid	23,400	19,400	16,900
Operating Segments | Distribution [Member]
Segment Reporting Information
Net sales	668,100	497,600	328,400
Operating income (loss)	54,500	35,900	11,500
Total assets	360,400	363,000	249,000
Depreciation	6,100	4,400	2,600
Amortization	800	700	600
Capital Expenditures Incurred In Year, Paid And Not Paid	13,400	6,500	3,500
Operating Segments | Fueling Systems
Segment Reporting Information
Net sales	334,100	289,100	245,100
Operating income (loss)	96,800	79,500	63,400
Total assets	269,100	273,600	268,900
Depreciation	2,500	2,200	2,100
Amortization	1,700	1,800	1,800
Capital Expenditures Incurred In Year, Paid And Not Paid	2,700	3,000	2,000
Operating Segments | United States & Canada | Water Systems
Segment Reporting Information
Net sales	596,900	460,800	327,600
Operating Segments | United States & Canada | Distribution [Member]
Segment Reporting Information
Net sales	668,100	497,600	328,400
Operating Segments | United States & Canada | Fueling Systems
Segment Reporting Information
Net sales	242,600	198,500	158,200
Operating Segments | Latin America | Water Systems
Segment Reporting Information
Net sales	159,300	139,500	118,500
Operating Segments | EMEA | Water Systems
Segment Reporting Information
Net sales	192,800	189,800	156,800
Operating Segments | Asia Pacific | Water Systems
Segment Reporting Information
Net sales	92,500	85,100	70,900
Operating Segments | Other | Fueling Systems
Segment Reporting Information
Net sales	91,500	90,600	86,900
Intersegment Sales | Water Systems
Segment Reporting Information
Net sales	116,000	88,400	60,900
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	(116,000)	(88,400)	(60,900)
Operating income (loss)	(66,400)	(65,300)	(58,800)
Intersegment Eliminations/Other | Intersegment Eliminations/Other
Segment Reporting Information
Total assets	47,200	44,200	108,500
Depreciation	4,100	3,800	3,700
Amortization	0	0	100
Capital Expenditures Incurred In Year, Paid And Not Paid	$ 1,600	$ 1,200	$ 500