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Oil and Gas Producing Activities (Unaudited) - Results of operations for oil and gas producing activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oil and Gas Exploration and Production Industries Disclosures [Abstract]      
Revenues   $ 1,427 $ 3,410
Costs and expenses:      
Production   (951) (3,337)
Producing property impairments $ 0 0 (30)
Depreciation, depletion and amortization   (423) (1,546)
Operating earnings (losses) before income taxes   53 (1,503)
Income tax benefit (expense)   (19) 526
Operating earnings (losses)   $ 34 $ (977)