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Suspended Well Costs (Tables)
 12 Months Ended
Dec. 31, 2019
Suspended Well Costs [Abstract]  
Net changes in capitalized exploratory well costs [Table Text Block]
The following table reflects the net changes in capitalized exploratory well costs during 2019, 2018, and 2017. 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,
 
2019
 
2018
 
2017
 
(in thousands)
Beginning balance
$
11,197

 
$
49,446

 
$
19,846

Additions to capitalized exploratory well costs pending the determination of proved reserves
11,925

 
11,197

 
49,446

Divestitures
—

 
(109
)
 
—

Reclassifications to wells, facilities, and equipment based on the determination of proved reserves
(11,197
)
 
(49,337
)
 
(19,846
)
Capitalized exploratory well costs charged to expense
—

 
—

 
—

Ending balance
$
11,925

 
$
11,197

 
$
49,446