Property, Plant, and Equipment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Property, Plant and Equipment [Line Items]
Capitalized costs of unproved properties included in amortization, cumulative		$ 226,500,000		$ 226,500,000
Non-cash Ceiling Test Write-Down Net of Tax		220,800,000
Loss on abandonment of assets	$ 0	0	$ 0	17,554,000
Oil and Natural Gas [Member]
Property, Plant and Equipment [Line Items]
Impairment of Oil and Gas Properties		267,800,000
Loss on abandonment of assets		17,600,000
Drilling Equipment [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use	0		0
Mid-Stream [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 0	64,000,000.0	$ 0
SCR drilling rigs [Member] | Drilling Equipment [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use		407,100,000
Other drilling equipment [Member] | Drilling Equipment [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use		3,000,000.0
BOSS drilling rigs [Member] | Drilling Equipment [Member]
Property, Plant and Equipment [Line Items]
Carrying value of asset group		$ 242,500,000		$ 242,500,000