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Note 4 - Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Gross trade receivables $ 135,998 $ 159,119
Allowance for doubtful accounts (7,355) (7,189)
Net trade receivables 128,643 151,930
Income tax receivables 39,813 32,600
Other Receivables, Net, Current 19,995 21,834
Total receivables, net $ 188,451 $ 206,364