Leases (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating Lease, Payments		$ 943	$ 659
Operating Lease, Cost		979	773
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		388	3,325
Lease, Cost		25,924	27,383
Short-term Lease, Cost		23,721	36,202
Variable Lease, Cost		21,932	23,762
Amounts charged as dilling costs		(20,708)	(33,354)
Operating Lease, Liability, Current		$ 936	$ 847
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Operating Lease, Liability, Noncurrent		$ 1,752	$ 2,232
Operating Lease, Weighted Average Remaining Lease Term		3 years 1 month 6 days	4 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent		3.24%	5.97%
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months		$ 936
Lessee, Operating Lease, Liability, Payments, Due Year Two		874
Lessee, Operating Lease, Liability, Payments, Due Year Three		872
Lessee, Operating Lease, Liability, Payments, Due Year Four		146
Lessee, Operating Lease, Liability, Payments, Due		2,828
Lessee, Operating Lease, Liability, Undiscounted Excess Amount		$ (140)
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Operating Lease, Liability		$ 2,688	$ 3,079
Operating Leases, Rent Expense, Net				$ 2,700
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, During the Year			800
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherAssetsNoncurrent
Other Noncurrent Assets
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset		$ 2,432	2,740
Accounting Standards Update 2019-01 [Member]
Lessee, Lease, Description [Line Items]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 2,500
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost		12,100	11,200
Operating Expense [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost		13,800	14,500
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Lease, Cost		$ 1,000	$ 800