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Materials, Supplies and Fuel:
9 Months Ended
Sep. 30, 2017
Inventory, Net [Abstract]  
Materials, Supplies and Fuel
MATERIALS, SUPPLIES AND FUEL

The following amounts by major classification are included in Materials, supplies and fuel in the accompanying Condensed Consolidated Balance Sheets (in thousands) as of:
 
September 30, 2017
 
December 31, 2016
 
September 30, 2016
Materials and supplies
$
73,938

 
$
68,456

 
$
67,257

Fuel - Electric Utilities
2,993

 
3,667

 
4,282

Natural gas in storage held for distribution
49,589

 
35,087

 
41,936

Total materials, supplies and fuel
$
126,520

 
$
107,210

 
$
113,475