XML 64 R37.htm IDEA: XBRL DOCUMENT v3.6.0.2
Energy and Related Sales, Net (Tables)
 12 Months Ended
Dec. 31, 2016
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

2016

 

 

 

2015

 

 

2014

 

 

Energy sales

$

3,613

 

 

 

$

5,315

 

 

$

11,886

 

 

Costs to produce

 

(3,972

)

 

 

 

(4,428

)

 

 

(6,204

)

 

Net

 

(359

)

 

 

 

887

 

 

 

5,682

 

 

Renewable energy credits

 

6,500

 

 

 

 

4,777

 

 

 

2,245

 

 

Total

$

6,141

 

 

 

$

5,664

 

 

$

7,927