Disclosures about Fair Value - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Commodity derivative instruments	$ 529,431	$ 127,632
Liabilities:
Commodity derivative instruments	(192,599)	(158,522)
Fair Value, Measurements, Recurring
Assets:
Total assets	624,766	127,632
Liabilities:
Total liabilities	(210,087)	(158,522)
Net (liability) asset	414,679	(30,890)
Fair Value, Measurements, Recurring | Level 1
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Net (liability) asset	0	0
Fair Value, Measurements, Recurring | Level 2
Assets:
Total assets	624,766	127,632
Liabilities:
Total liabilities	(210,087)	(158,522)
Net (liability) asset	414,679	(30,890)
Fair Value, Measurements, Recurring | Level 3
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Net (liability) asset	0	0
Fair Value, Measurements, Recurring | Commodity derivative instruments(1)
Assets:
Commodity derivative instruments	624,766	127,632
Liabilities:
Commodity derivative instruments	(210,087)	(158,522)
Fair Value, Measurements, Recurring | Commodity derivative instruments(1) | Level 1
Assets:
Commodity derivative instruments	0	0
Liabilities:
Commodity derivative instruments	0	0
Fair Value, Measurements, Recurring | Commodity derivative instruments(1) | Level 2
Assets:
Commodity derivative instruments	624,766	127,632
Liabilities:
Commodity derivative instruments	(210,087)	(158,522)
Fair Value, Measurements, Recurring | Commodity derivative instruments(1) | Level 3
Assets:
Commodity derivative instruments	0	0
Liabilities:
Commodity derivative instruments	$ 0	$ 0