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Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Trade receivables:      
Gross trade receivables $ 254,170   $ 256,851
Allowance for doubtful accounts (10,035)   (9,457)
Net trade receivables 244,135   247,394
Income tax receivables 5,745   6,905
Other receivables 14,134   11,567
Total receivables, net $ 264,014 $ 257,425 $ 265,866