Acquisitions and Disposal of Assets (Details) $ in Thousands		3 Months Ended
	Feb. 05, 2021 USD ($)	Mar. 31, 2021 USD ($) MMBTU MMBoe	Mar. 31, 2020 USD ($) MMBoe MMBTU
Assets and Liabilities Held for Sale [Line Items]
Proceeds from sale of assets		$ 37,238	$ 989
Total revenues		33,623	40,329
Lease operating expenses		7,954	15,642
Production, ad valorem, and other taxes		$ 2,176	$ 3,199
Production volume (MMBoe) | MMBTU		1,600	2,600
Disposal Group, Held-for-sale, Not Discontinued Operations | North Park Basin, Colorado
Assets and Liabilities Held for Sale [Line Items]
Purchase price	$ 47,000
Proceeds from sale of assets	39,700
Reduction of full cost pool assets	22,000
Reduction in non-full cost pool assets	4,600
Gain on sale	19,700
Gain from release of revenues in suspense	500
Gain from relief of asset retirement obligations	6,100
Reduction in oil and gas properties related to NPB	$ 26,600
Total revenues		$ 3,200	$ 12,800
Total revenues, percent of total		9.40%	31.60%
Lease operating expenses		$ 900	$ 3,500
Lease operating expense, percent of total		11.60%	22.70%
Production, ad valorem, and other taxes		$ 200	$ 800
Production, ad valorem, and other taxes, percent of total		11.40%	24.10%
Production volume (MMBoe) | MMBoe		100	300
Production volume, percent of total		4.10%	12.80%