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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
2015
 
2014
 
(In thousands)
ARO liability, January 1:
$
100,567

 
$
133,657

Accretion of discount
3,453

 
4,599

Liability incurred
6,754

 
6,246

Liability settled
(2,893
)
 
(4,490
)
Liability sold
(421
)
 
(1,206
)
Revision of estimates (1)
(9,163
)
 
(38,239
)
ARO liability, December 31:
98,297

 
100,567

Less current portion
3,965

 
3,204

Total long-term ARO liability
$
94,332

 
$
97,363

_________________________
(1)
Plugging liability estimates were revised in both 2015 and 2014 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments as well as changes in estimated timing of cash flows.