Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
ASU 2016-02 Lease assets and liabilities recognition		$ 19,000
Operating Lease, Liability	$ 10,219	10,219
Operating lease costs	2,784	9,330
Variable Lease, Cost	3,820	11,633
Short-term Lease, Cost	47,956	142,634
Lease, Cost	54,560	163,597
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	615	615
Operating cash flows from operating leases	$ 202	$ 600
Operating Lease, Weighted Average Remaining Lease Term	9 years 2 months 12 days	9 years 2 months 12 days
Weighted average discount rate	4.80%	4.80%
Drilling rig commitments [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 4,706	$ 4,706
Surface use agreements [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	3,932	3,932
Field equipment [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	1,238	1,238
Other [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 343	$ 343