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Additional Balance Sheet Details (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Trade accounts receivable, net $ 11,643 $ 15,926
Federal income tax receivable, net 9,037 8,262
Commodity derivative settlement receivables 2,390 0
Other receivables 3,900 21,005
Total $ 26,970 $ 45,193