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ACCOUNTS RECEIVABLE (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Receivables [Abstract]        
Accounts receivable $ 205,084,000us-gaap_AccountsReceivableGrossCurrent $ 268,340,000us-gaap_AccountsReceivableGrossCurrent    
Allowance for doubtful accounts (5,706,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (5,287,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (5,130,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (4,204,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 199,378,000us-gaap_AccountsReceivableNetCurrent $ 263,053,000us-gaap_AccountsReceivableNetCurrent