GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Goodwill [Roll Forward]
Balance at beginning of period	$ 197,362
Purchase price adjustment	(151)
Translation adjustment	0
Balance at end of period	197,211
Other Intangibles Assets [Roll Forward]
Balance at beginning of period	112,297
Purchase price adjustment	0
Translation adjustment	922
Amortization	(13,557)	$ (15,907)
Balance at end of period	99,662
Total Goodwill and Intangible Assets [Roll Forward]
Balance at beginning of period	309,659
Purchase price adjustment	(151)
Translation adjustment	922
Amortization	(13,557)	$ (15,907)
Balance at end of period	296,873
Service Centers [Member]
Goodwill [Roll Forward]
Balance at beginning of period	164,244
Balance at end of period	164,093
Innovative Pumping Solutions [Member]
Goodwill [Roll Forward]
Balance at beginning of period	15,980
Balance at end of period	15,980
Supply Chain Services [Member]
Goodwill [Roll Forward]
Balance at beginning of period	17,138
Balance at end of period	$ 17,138