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Gas Reserves (tables)
 12 Months Ended
Dec. 31, 2012
Gas Reserves Table [Abstract]  
Gas Reserves Table [Text Block]
In thousands
 
2012
 
2011
Gas reserves, current
 
$
14,966

 
$
4,463

Gas reserves, non-current
 
92,179

 
48,597

Less: Accumulated amortization
 
7,486

 
1,146

Total gas reserves
 
99,659

 
51,914

Less: Deferred taxes on gas reserves
 
28,329

 
15,630

Net investment in gas reserves
 
$
71,330

 
$
36,284