ACCOUNTS RECEIVABLE AND RELATED ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable, Net [Abstract]
Accounts receivable	$ 72,698us-gaap_AccountsReceivableGross	$ 74,231us-gaap_AccountsReceivableGross
Allowance for doubtful accounts	(2,449)	(2,413)	(2,703)
Accounts receivable, net of allowance for doubtful accounts	70,249us-gaap_AccountsReceivableNetCurrent	71,818us-gaap_AccountsReceivableNetCurrent
Allowance for doubtful accounts
Allowance for doubtful accounts	2,413	2,703	3,319
Additions Charged to Costs and Expenses	(1,004)us-gaap_ProvisionForOtherCreditLosses	(824)us-gaap_ProvisionForOtherCreditLosses	(390)us-gaap_ProvisionForOtherCreditLosses
Deduction From Reserves	(968)us-gaap_ProvisionForOtherLosses	(1,114)us-gaap_ProvisionForOtherLosses	(1,006)us-gaap_ProvisionForOtherLosses
Allowance for doubtful accounts	$ 2,449	$ 2,413	$ 2,703

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.9)

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a(1)

-Article 5

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-Name Regulation S-X (SX)

-Number 210

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- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

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-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of expense related to credit loss from transactions other than loan and lease transactions.

+ References

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- Definition

Amount of expense related to other loss.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Paragraph 2

-Subparagraph (SX 210.5-03.5)

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-Publisher SEC

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