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Energy and Related Sales, Net (Tables)
12 Months Ended
Dec. 31, 2015
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

     2015        2014        2013   

Energy sales

   $ 5,315      $ 11,886      $ 8,189   

Costs to produce

     (4,428     (6,204     (6,784

Net

     887        5,682        1,405   

Renewable energy credits

     4,777        2,245        1,748   

Total

   $ 5,664      $ 7,927      $ 3,153