SEGMENT REPORTING, Business Segmented Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 238,527	$ 253,561
Income (loss) from operations	8,236	(2,002)
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Sales	238,527	253,561
Amortization	4,316	4,528
Income (loss) from operations	16,592	8,794
Operating income, excluding amortization	20,908	13,322
Reportable Segment [Member] \| Service Centers [Member]
Segment Reporting Information [Line Items]
Sales	148,713	167,502
Amortization	2,250	2,295
Income (loss) from operations	11,090	7,241
Operating income, excluding amortization	13,340	9,536
Reportable Segment [Member] \| Innovative Pumping Solutions [Member]
Segment Reporting Information [Line Items]
Sales	49,058	47,431
Amortization	1,795	1,962
Income (loss) from operations	1,715	(1,656)
Operating income, excluding amortization	3,510	306
Reportable Segment [Member] \| Supply Chain Services [Member]
Segment Reporting Information [Line Items]
Sales	40,756	38,628
Amortization	271	271
Income (loss) from operations	3,787	3,209
Operating income, excluding amortization	$ 4,058	$ 3,480

Operating income for reportable segments excluding amortization of intangibles.

No definition available.

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- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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