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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
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at Beginning of Period $ 1,800us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,203us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,250us-gaap_AllowanceForDoubtfulAccountsReceivable
Charged to Costs and Expenses 1,325us-gaap_ProvisionForDoubtfulAccounts 619us-gaap_ProvisionForDoubtfulAccounts 1,244us-gaap_ProvisionForDoubtfulAccounts
Deductions/ Other (944)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease (1,022)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease (1,291)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Balance at End of Year $ 2,181us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,800us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,203us-gaap_AllowanceForDoubtfulAccountsReceivable