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Materials, Supplies and Fuel (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Materials and supplies $ 81,382 $ 75,081
Fuel - Electric Utilities 2,535 2,850
Natural gas in storage held for distribution 39,085 39,368
Total materials, supplies and fuel $ 123,002 $ 117,299