SEGMENT REPORTING - Financial Information of Company's Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information, Profit (Loss) [Abstract]
Total Sales	$ 472,935	$ 419,249	$ 1,331,126	$ 1,271,556
Total Segments Operating Income	69,929	58,100	185,525	177,623
Service Centers
Segment Reporting Information, Profit (Loss) [Abstract]
Total Sales	316,831	294,459	911,783	914,078
Total Segments Operating Income	46,154	41,912	130,329	134,549
Innovative Pumping Solutions
Segment Reporting Information, Profit (Loss) [Abstract]
Total Sales	89,825	58,962	225,417	158,440
Total Segments Operating Income	18,207	10,599	38,543	26,555
Supply Chain Services
Segment Reporting Information, Profit (Loss) [Abstract]
Total Sales	66,279	65,828	193,926	199,038
Total Segments Operating Income	$ 5,568	$ 5,589	$ 16,653	$ 16,519