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Goodwill (Tables)
6 Months Ended
Jun. 30, 2013
Goodwill [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill by segment is as follows for both June 30, 2013 and December 31, 2012 (in thousands):

Electric
$
241,100

Natural gas
114,028

 
$
355,128