XML 32 R62.htm IDEA: XBRL DOCUMENT v3.19.3
Derivatives And Risk Management (Energy Commodity Derivatives) (Details)
frequency in Thousands, Volt in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Volt
frequency
Dec. 31, 2018
Volt
frequency
Sales [Member] | Physical [Member] | Electric Derivative [Member]    
Energy Commodity Derivative Volumes [Line Items]    
2019 37 197
2020 123 123
2021 0 0
2022 0 0
2023 0 0
Thereafter 0 0
Sales [Member] | Physical [Member] | Gas Derivative [Member]    
Energy Commodity Derivative Volumes [Line Items]    
2019 | Volt 1,166 2,909
2020 | Volt 1,430 1,430
2021 | Volt 1,040 1,049
2022 0 0
2023 0 0
Thereafter | Volt 0 0
Sales [Member] | Financial [Member] | Electric Derivative [Member]    
Energy Commodity Derivative Volumes [Line Items]    
2019 696 2,790
2020 1,107 959
2021 246 0
2022 0 0
2023 0 0
Thereafter 0 0
Sales [Member] | Financial [Member] | Gas Derivative [Member]    
Energy Commodity Derivative Volumes [Line Items]    
2019 | Volt 15,878 54,418
2020 | Volt 33,215 14,625
2021 | Volt 9,475 4,100
2022 | Volt 0 0
2023 0 0
Thereafter | Volt 0 0
Purchase [Member] | Physical [Member] | Electric Derivative [Member]    
Energy Commodity Derivative Volumes [Line Items]    
2019 2 206
2020 0 0
2021 0 0
2022 0 0
2023 0 0
Thereafter 0 0
Purchase [Member] | Physical [Member] | Gas Derivative [Member]    
Energy Commodity Derivative Volumes [Line Items]    
2019 | Volt 4,208 10,732
2020 | Volt 1,138 1,138
2021 | Volt 153 0
2022 | Volt 225 0
2023 | Volt 0 0
Thereafter | Volt 0 0
Purchase [Member] | Financial [Member] | Electric Derivative [Member]    
Energy Commodity Derivative Volumes [Line Items]    
2019 420 941
2020 422 0
2021 0 0
2022 0 0
2023 0 0
Thereafter 0 0
Purchase [Member] | Financial [Member] | Gas Derivative [Member]    
Energy Commodity Derivative Volumes [Line Items]    
2019 | Volt 33,788 101,293
2020 | Volt 65,360 47,225
2021 | Volt 21,280 9,670
2022 | Volt 3,150 0
2023 | Volt 0 0
Thereafter | Volt 0 0