SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information
Net sales	$ 1,661,865	$ 1,247,331	$ 1,314,578
Operating income (loss)	189,193	130,511	127,133
Total assets	1,575,165	1,272,307	1,194,700
Depreciation	30,200	27,100	27,600
Amortization	14,400	9,400	9,400
Capital Expenditures Incurred In Year, Paid And Not Paid	30,100	22,900	22,100
Long-lived assets	842,900	644,200	618,100
United States
Segment Reporting Information
Net sales	1,075,700	760,600	776,600
Long-lived assets	604,500	405,900	394,700
Foreign
Segment Reporting Information
Net sales	586,200	486,700	538,000
Long-lived assets	238,400	238,300	223,400
Operating Segments | Water Systems
Segment Reporting Information
Net sales	963,600	734,700	781,500
Operating income (loss)	139,100	114,400	103,000
Total assets	894,400	645,900	658,300
Depreciation	19,800	18,700	19,000
Amortization	11,900	6,900	6,900
Capital Expenditures Incurred In Year, Paid And Not Paid	19,400	16,900	15,100
Operating Segments | Distribution
Segment Reporting Information
Net sales	497,600	328,400	291,800
Operating income (loss)	35,900	11,500	3,600
Total assets	363,000	249,000	180,200
Depreciation	4,400	2,600	2,800
Amortization	700	600	500
Capital Expenditures Incurred In Year, Paid And Not Paid	6,500	3,500	3,900
Operating Segments | Fueling Systems
Segment Reporting Information
Net sales	289,100	245,100	293,600
Operating income (loss)	79,500	63,400	75,800
Total assets	273,600	268,900	283,800
Depreciation	2,200	2,100	2,100
Amortization	1,800	1,800	1,900
Capital Expenditures Incurred In Year, Paid And Not Paid	3,000	2,000	1,900
Operating Segments | United States & Canada | Water Systems
Segment Reporting Information
Net sales	460,800	327,600	367,600
Operating Segments | United States & Canada | Distribution
Segment Reporting Information
Net sales	497,600	328,400	291,800
Operating Segments | United States & Canada | Fueling Systems
Segment Reporting Information
Net sales	198,500	158,200	173,500
Operating Segments | Latin America | Water Systems
Segment Reporting Information
Net sales	139,500	118,500	124,200
Operating Segments | EMEA | Water Systems
Segment Reporting Information
Net sales	189,800	156,800	155,600
Operating Segments | Asia Pacific | Water Systems
Segment Reporting Information
Net sales	85,100	70,900	81,800
Operating Segments | Other | Fueling Systems
Segment Reporting Information
Net sales	90,600	86,900	120,100
Intersegment Sales | Water Systems
Segment Reporting Information
Net sales	88,400	60,900	52,300
Intersegment Sales | Distribution
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	(88,400)	(60,900)	(52,300)
Operating income (loss)	(65,300)	(58,800)	(55,300)
Intersegment Eliminations/Other | Intersegment Eliminations/Other
Segment Reporting Information
Total assets	44,200	108,500	72,400
Depreciation	3,800	3,700	3,700
Amortization	0	100	100
Capital Expenditures Incurred In Year, Paid And Not Paid	$ 1,200	$ 500	$ 1,200