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Energy and Related Sales, Net (Tables)
12 Months Ended
Dec. 31, 2014
Text Block [Abstract]  
Summary of Energy and Related Sales Net

The following table summarizes this activity for each of the past three years:

 

     Year ended December 31  

In thousands

     2014        2013        2012   

Energy sales

   $ 11,886      $ 8,189      $ 5,284   

Costs to produce

     (6,204     (6,784     (4,187

Net

     5,682        1,405        1,097   

Renewable energy credits

     2,245        1,748        5,903   

Total

   $ 7,927      $ 3,153      $ 7,000