Annual report pursuant to Section 13 and 15(d)

TRADE RECEIVABLES (Details)

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TRADE RECEIVABLES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Trade Receivables    
Gross trade receivables $ 117,301 $ 109,616
Allowance for doubtful accounts (13,285) (11,814)
Net trade receivables $ 104,016 $ 97,802