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Energy and Related Sales, Net (Tables)
12 Months Ended
Dec. 31, 2013
Text Block [Abstract]  
Summary of Energy and Related Sales Net

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

 

In thousands

    2013        2012        2011   

Energy sales

  $ 8,189      $ 5,284      $ 10,992   

Costs to produce

    (6,784     (4,187     (9,319

Net energy sales

    1,405        1,097        1,673   

Renewable energy credits

    1,748        5,903        7,671   

Total energy and related sales, net

  $ 3,153      $ 7,000      $ 9,344