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Additional Balance Sheet Details (Trade and Other Receivables, Net) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Commodity derivative settlement receivables $ 15,396 $ 675
Trade accounts receivable, net 13,504 12,630
Federal income tax receivable, net 11,054 2,987
Other receivables 1,543 2,026
Total $ 41,497 $ 18,318