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Note 6 - Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Gross trade receivables $ 157,073 $ 299,962
Allowance for doubtful accounts (6,691) (5,458)
Net trade receivables 150,382 294,504
Other receivables 26,258 24,096
Total receivables, net $ 176,640 $ 318,600