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ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Receivables [Abstract] |  |
Accounts receivable | $ 297,106 | $ 229,677
Allowance for doubtful accounts | 2,601 | 2,974
Accounts receivable, net | $ 294,505 | $ 226,703

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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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: 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
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