SEGMENT REPORTING - Financial Information of Company's Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information, Profit (Loss) [Abstract]
Total Sales	$ 445,556	$ 428,040	$ 858,191	$ 852,307
Total Segments Operating Income	63,044	58,999	115,596	119,523
Service Centers
Segment Reporting Information, Profit (Loss) [Abstract]
Total Sales	306,516	313,806	594,952	619,619
Total Segments Operating Income	43,855	46,823	84,175	92,637
Innovative Pumping Solutions
Segment Reporting Information, Profit (Loss) [Abstract]
Total Sales	73,377	48,067	135,592	99,478
Total Segments Operating Income	13,366	6,760	20,336	15,956
Supply Chain Services
Segment Reporting Information, Profit (Loss) [Abstract]
Total Sales	65,663	66,167	127,647	133,210
Total Segments Operating Income	$ 5,823	$ 5,416	$ 11,085	$ 10,930