SEGMENT REPORTING, Reconciliation of operating Income to Consolidated Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Adjustment for [Abstract]
Amortization of intangible assets			$ 8,607	$ 9,038
Income from operations	$ 10,257	$ 8,849	18,493	6,847
Interest expense	3,992	3,951	7,645	7,360
Other expense (income), net	57	9	(171)	(146)
Income (loss) before provision for income taxes	6,208	4,889	11,019	(367)
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Operating income for reportable segments, excluding amortization	23,890	22,286	44,798	35,609
Adjustment for [Abstract]
Income from operations	19,599	17,776	36,191	26,571
Reportable Segment [Member] \| Service Centers [Member]
Adjustment for [Abstract]
Income from operations	16,190	10,313	27,281	17,555
Reportable Segment [Member] \| Innovative Pumping Solutions [Member]
Adjustment for [Abstract]
Income from operations	(38)	3,532	1,676	1,876
Reportable Segment [Member] \| Supply Chain Services [Member]
Adjustment for [Abstract]
Income from operations	3,447	3,931	7,234	7,140
Segment Reconciling Items [Member]
Adjustment for [Abstract]
Amortization of intangible assets	4,291	4,510	8,607	9,038
Corporate expense	$ 9,342	$ 8,927	$ 17,698	$ 19,724

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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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