SEGMENT REPORTING, Reconciliation of operating Income to Consolidated Income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Adjustment for [Abstract]
Amortization of intangible assets			$ 12,943	$ 13,557
Income from operations	$ 6,510	$ 4,933	25,003	11,780
Interest expense	4,928	4,338	12,573	11,698
Other income, net	(153)	(251)	(324)	(397)
Income before provision for income taxes	1,735	846	12,754	479
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Operating income for reportable segments, excluding amortization	21,370	18,904	66,169	54,513
Adjustment for [Abstract]
Income from operations	17,034	14,385	53,226	40,956
Reportable Segment [Member] \| Service Centers [Member]
Adjustment for [Abstract]
Income from operations	13,288	11,053	40,570	28,608
Reportable Segment [Member] \| Innovative Pumping Solutions [Member]
Adjustment for [Abstract]
Income from operations	35	(326)	1,710	1,549
Reportable Segment [Member] \| Supply Chain Services [Member]
Adjustment for [Abstract]
Income from operations	3,711	3,658	10,946	10,799
Segment Reconciling Items [Member]
Adjustment for [Abstract]
Amortization of intangible assets	4,336	4,519	12,943	13,557
Corporate expense	$ 10,524	$ 9,452	$ 28,223	$ 29,176

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Operating income for reportable segments before amortization of intangibles, corporate and other expense, net.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of the cost of borrowed funds accounted for as interest expense.

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