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NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Balance at Beginning of Period | $ 1,800 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 2,203 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 2,250 us-gaap_AllowanceForDoubtfulAccountsReceivable
Charged to Costs and Expenses | 1,325 us-gaap_ProvisionForDoubtfulAccounts | 619 us-gaap_ProvisionForDoubtfulAccounts | 1,244 us-gaap_ProvisionForDoubtfulAccounts
Deductions/ Other | (944)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | (1,022)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | (1,291)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Balance at End of Year | $ 2,181 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 1,800 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 2,203 us-gaap_AllowanceForDoubtfulAccountsReceivable

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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 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of increase (decrease) in the allowance for doubtful accounts. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
Name: | us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration