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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2016
Goodwill [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill by segment is as follows for both March 31, 2016 and December 31, 2015 (in thousands):

Electric
$
243,558

Natural gas
114,028

 
$
357,586