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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Schedule Of Asset Retirement Obligations [Table Text Block]
The following table shows certain information about our AROs for the periods indicated:
 
2017
 
2016
 
(In thousands)
ARO liability, January 1:
$
70,170

 
$
98,297

Accretion of discount
2,886

 
2,779

Liability incurred
1,948

 
584

Liability settled
(2,694
)
 
(1,215
)
Liability sold
(1,735
)
 
(10,882
)
Revision of estimates (1)
(1,131
)
 
(19,393
)
ARO liability, December 31:
69,444

 
70,170

Less current portion
1,726

 
2,906

Total long-term ARO liability
$
67,718

 
$
67,264

_________________________
(1)
Plugging liability estimates were revised in both 2017 and 2016 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments and changes in estimated timing of cash flows.