SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Adjustment for [Abstract]
Amortization of intangibles	$ 5,358us-gaap_AmortizationOfIntangibleAssets	$ 5,577us-gaap_AmortizationOfIntangibleAssets
Operating income	18,099us-gaap_OperatingIncomeLoss	21,154us-gaap_OperatingIncomeLoss
Interest expense, net	2,683us-gaap_InterestExpense	3,397us-gaap_InterestExpense
Other expense (income), net	(249)us-gaap_NonoperatingIncomeExpense	(150)us-gaap_NonoperatingIncomeExpense
Income before income taxes	15,665	17,907
Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales	341,594	348,504
Operating income for reportable segments	34,771	37,099
Adjustment for [Abstract]
Operating income	18,099	21,154
Operating Segments [Member] \| Service Centers [Member]
Segment Reporting Information [Line Items]
Sales	225,792	231,224
Operating income for reportable segments	22,866	24,425
Operating Segments [Member] \| IPS [Member]
Segment Reporting Information [Line Items]
Sales	74,263	79,881
Operating income for reportable segments	8,626	9,549
Operating Segments [Member] \| SCS [Member]
Segment Reporting Information [Line Items]
Sales	41,539	37,399
Operating income for reportable segments	3,279	3,125
Segment Reconciling Items [Member]
Adjustment for [Abstract]
Amortization of intangibles	5,358	5,577
Corporate and other expense, net	$ 11,314	$ 10,368

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

+ References

No definition available.

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- Definition

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.

+ 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)

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-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

-Paragraph 1

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-Topic 235

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-Section S99

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

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-Section S99

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

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- Definition

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

+ References

No definition available.

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- Definition

The sum of expenses not otherwise specified in the taxonomy for 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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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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-Name Regulation S-X (SX)

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-Section 03

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