Supplemental Financial Data - Oil and Gas Producing Activities (unaudited) (Details 4) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Oil, gas and NGL sales, including commodity derivative gains and losses	$ 96,885	$ 52,946
Expenses:
Production expenses	41,307	22,226
Depletion expense	14,062	7,305
Accretion of asset retirement obligations	1,625	868
Total expenses	56,994	30,399
Results of operations from oil and gas producing activities	$ 39,891	$ 22,547
Depletion rate per Mcfe	$ 0.56	$ 0.89