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Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Trade receivables:      
Gross trade receivables $ 244,003   $ 256,851
Allowance for doubtful accounts (9,460)   (9,457)
Net trade receivables 234,543   247,394
Income tax receivables 7,261   6,905
Other receivables 10,350   11,567
Total receivables, net $ 252,154 $ 257,425 $ 265,866