Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Unevaluated Property Costs not Subject to Amortization (Details)

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Property and Equipment, Net - Unevaluated Property Costs not Subject to Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]        
Unevaluated property costs $ 401,403 $ 113,079 $ 479,836 $ 818,509
Unevaluated property costs, total $ 1,812,827 $ 1,733,250