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Gas Reserves (tables)
 6 Months Ended
Jun. 30, 2013
Gas Reserves Table [Abstract]  
Gas Reserves Table [Text Block]

 
June 30,
 
December 31,
In thousands
 
2013
 
2012
 
2012
Gas reserves, current
 
$
15,324

 
$
11,021

 
$
14,966

Gas reserves, non-current
 
126,215

 
69,097

 
92,179

Less: Accumulated amortization
 
12,453

 
4,071

 
7,486

Total gas reserves
 
129,086

 
76,047

 
99,659

Less: Deferred tax liabilities on gas reserves
 
39,963

 
26,839

 
28,329

Net investment in gas reserves
 
$
89,123

 
$
49,208

 
$
71,330