Leases Description of leases (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 9,128
Drilling rig commitments [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	3,154
Surface use agreements [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	4,487
Field equipment [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	1,164
Other [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 323