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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation [Abstract]  
Schedule of Asset Retirement Obligations [Table Text Block]

 

 

 

 

 

 

 

 

 

2012

 

2011

 

 

(in thousands)

 

 

 

 

 

 

 

Asset Retirement obligation at January 1

 

$
37,693 

 

$
27,786 

Accretion of discount

 

 
2,394 

 

 
1,361 

Obligations incurred

 

 
23,327 

 

 
4,304 

Obligations settled/removed

 

 
(8,804)

 

 
(883)

Revisions of estimates

 

 
46,027 

 

 
5,125 

Asset retirement obligation at December 31

 

$
100,637 

 

$
37,693 

 

 

 

 

 

 

 

Current liability

 

 
4,091 

 

 
1,539 

Long-term liability

 

 
96,546 

 

 
36,154 

Asset retirement obligation at December 31

 

$
100,637 

 

$
37,693