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Suspended Well Costs (Tables)
12 Months Ended
Dec. 31, 2020
Extractive Industries [Abstract]  
Net changes in capitalized exploratory well costs [Table Text Block]
The following table reflects the net changes in capitalized exploratory well costs during 2020, 2019, and 2018. The table does not include amounts that were capitalized and either subsequently expensed or reclassified to producing well costs in the same year:
For the Years Ended December 31,
202020192018
(in thousands)
Beginning balance$11,925 $11,197 $49,446 
Additions to capitalized exploratory well costs pending the determination of proved reserves3,346 11,925 11,197 
Divestitures
— — (109)
Reclassifications based on the determination of proved reserves(9,573)(11,197)(49,337)
Capitalized exploratory well costs charged to expense— — — 
Ending balance$5,698 $11,925 $11,197