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Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Receivables [Abstract]    
Gross trade receivables $ 143,277 $ 159,119
Allowance for doubtful accounts (8,442) (7,189)
Net trade receivables 134,835 151,930
Income tax receivables 20,129 32,600
Other receivables 22,520 21,834
Total receivables, net $ 177,484 $ 206,364