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Materials, Supplies and Fuel:
3 Months Ended
Mar. 31, 2019
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:
 
March 31, 2019
 
December 31, 2018
 
March 31, 2018
Materials and supplies
$
76,728

 
$
75,081

 
$
72,045

Fuel - Electric Utilities
2,485

 
2,850

 
2,903

Natural gas in storage held for distribution
8,463

 
39,368

 
7,097

Total materials, supplies and fuel
$
87,676

 
$
117,299

 
$
82,045