Summary of Significant Accounting Policies - Non-cash Impairment Charges (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Schedule of Non-cash Impairment Charges [Line Items]
Abandonment expense	$ 562	$ 322
Impairment and abandonment expense	1,265,426	322
Unproved Oil and Gas Properties
Schedule of Non-cash Impairment Charges [Line Items]
Impairment of Oil and Gas Properties	76,298	0
Proved Oil and Gas Properties
Schedule of Non-cash Impairment Charges [Line Items]
Impairment of Oil and Gas Properties	$ 1,188,566	$ 0

The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

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Period Type:	duration