Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 2,901	$ 2,500	$ 2,901	$ 0
Operating Lease, Payments			442
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	800	2,500	3,325
Operating Lease, Liability, Current	858		858	0
Operating Lease, Liability, Noncurrent	2,389		2,389	$ 0
Operating Lease, Liability	$ 3,247	$ 2,800	$ 3,247
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 18 days		4 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	5.97%		5.97%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 217		$ 217
Lessee, Operating Lease, Liability, Payments, Due Year Two	847		847
Lessee, Operating Lease, Liability, Payments, Due Year Three	830		830
Lessee, Operating Lease, Liability, Payments, Due Year Four	833		833
Lessee, Operating Lease, Liability, Payments, Due Year Five	833		833
Lessee, Operating Lease, Liability, Payments, Due after Year Five	139		139
Lessee, Operating Lease, Liability, Payments, Due	3,699		3,699
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(452)		(452)
Operating Lease, Cost	208		565
Short-term Lease, Cost	9,969		33,024
Variable Lease, Cost	6,777		17,420
Amounts charged as dilling costs	(9,224)		(30,865)
Lease, Cost	7,730		20,144
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	3,900		8,900
Operating Expense [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	3,600		10,700
General and Administrative Expense [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 200		$ 600
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	2 years		2 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	5 years		5 years