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Suspended Well Costs (Tables)
 12 Months Ended
Dec. 31, 2017
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 2017, 2016, and 2015. 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,
 
2017
 
2016
 
2015
 
(in thousands)
Beginning balance
$
19,846

 
$
11,952

 
$
43,589

Additions to capitalized exploratory well costs pending the determination of proved reserves
49,446

 
19,846

 
11,952

Divestitures
—

 
—

 
(809
)
Reclassifications to wells, facilities, and equipment based on the determination of proved reserves
(19,846
)
 
(11,952
)
 
(18,485
)
Capitalized exploratory well costs charged to expense
—

 
—

 
(24,295
)
Ending balance
$
49,446

 
$
19,846

 
$
11,952