Commitments (Details) $ in Millions	Jun. 30, 2019 USD ($)
Drilling Rig Leasing Contracts [Member]
Commitments and Contingencies [Line Items]
Contractual obligation	$ 77.8
Early termination penalties for rig contracts	43.5
Electricity Purchase Agreement [Member]
Commitments and Contingencies [Line Items]
Contractual obligation	57.1
Minimum [Member] | Sand Sourcing Commitment [Member]
Commitments and Contingencies [Line Items]
Potential penalty for not meeting minimum sand sourcing requirements	0.0
Minimum [Member] | Completion Service Commitment [Member]
Commitments and Contingencies [Line Items]
Potential penalty for not meeting minimum completion service arrangement requirements	0.0
Maximum [Member] | Sand Sourcing Commitment [Member]
Commitments and Contingencies [Line Items]
Potential penalty for not meeting minimum sand sourcing requirements	10.0
Maximum [Member] | Completion Service Commitment [Member]
Commitments and Contingencies [Line Items]
Potential penalty for not meeting minimum completion service arrangement requirements	$ 15.1