Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating leases	$ 3,660	$ 6,742
Short-term leases	4,528	8,369
Financing leases
Depreciation of assets	231	440
Interest on lease liabilities	33	64
Total financing leases	264	504
Total lease expense	8,452	15,615
Lease operating
Lessee, Lease, Description [Line Items]
Operating leases	2,965	5,207
Short-term leases	3,392	5,601
Plant and other midstream services
Lessee, Lease, Description [Line Items]
Operating leases	30	61
Short-term leases	1,131	2,751
General and administrative
Lessee, Lease, Description [Line Items]
Operating leases	665	1,474
Short-term leases	5	17
Drilling Rig Leases
Financing leases
Gross payments	8,200	13,500
Drilling Rig Leases And Other Equipment Rentals
Financing leases
Gross payments	$ 10,700	$ 37,200