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Additional Balance Sheet Details (Trade and Other Receivables, Net) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade accounts receivable, net $ 12,790 $ 12,630
Federal income tax receivable, net 10,457 2,987
Commodity derivative settlement receivables 9,037 675
Other receivables 2,165 2,026
Total $ 34,449 $ 18,318