Commitments and Contingencies - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	11 years 8 months 12 days
Operating lease cost	$ 6.0
Variable lease cost	3.5
Short-term lease payments	$ 157.7
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	1 month
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	26 years 6 months
Drilling Rigs, Fracturing and Other Equipment | Minimum
Lessee, Lease, Description [Line Items]
Short-term lease, term	30 days
Drilling Rigs, Fracturing and Other Equipment | Maximum
Lessee, Lease, Description [Line Items]
Short-term lease, term	1 year