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Standardized measure of future net cash flows related to proved reserves (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Standardized measure of future net cash flows related to proved reserves    
Future oil and gas cash inflows $ 19,368 $ 14,326
Future oil & gas operating expenses (4,605) (2,554)
Future development costs (2,982) (1,982)
Future tax expense (1,308) (998)
Future net cash flows 10,473 8,792
10% discount to reflect timing of cash flows (4,150) (2,878)
Future net cash flows related to proved reserves $ 6,323 $ 5,914