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Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Trade receivables:    
Gross trade receivables $ 242,483 $ 248,176
Allowance for doubtful accounts (9,559) (10,034)
Net trade receivables 232,924 238,142
Income tax receivables 9,549 9,027
Other receivables 7,580 7,225
Total receivables, net $ 250,053 $ 254,394