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Revenue Revenue (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | Disaggregation of Total Operating Revenue The following table disaggregates total operating revenue by segment and source for the three and six months ended June 30 (dollars in thousands):
| Three months ended |  | Six months ended
| June 30, 2018 |  | June 30, 2018
Avista Utilities |  |  |
Revenue from contracts with customers | $ | 239,113 |  |  | $ | 593,275 |
Derivative revenues | 56,357 |  |  | 114,749 |
Alternative revenue programs | 3,570 |  |  | (2,369 | )
Deferrals and amortizations for rate refunds to customers | 982 |  |  | (18,840 | )
Other utility revenues | 2,200 |  |  | 4,161 |
Total Avista Utilities | 302,222 |  |  | 690,976 |
AEL&P |  |  |
Revenue from contracts with customers | 10,759 |  |  | 25,409 |
Deferrals and amortizations for rate refunds to customers | (427 | ) |  | (1,549 | )
Other utility revenues | 150 |  |  | 285 |
Total AEL&P | 10,482 |  |  | 24,145 |
Other |  |  |
Revenue from contracts with customers | 6,324 |  |  | 13,053 |
Other revenues | 270 |  |  | 485 |
Total other | 6,594 |  |  | 13,538 |
Total operating revenues | $ | 319,298 |  |  | $ | 728,659 |
Utility Revenue from Contracts with Customers by Type and Service The following table disaggregates revenue from contracts with customers associated with the Company's utility operations for the three and six months ended June 30 (dollars in thousands):
| Three months ended June 30, 2018 |  | Six months ended June 30, 2018
| Avista Utilities |  | AEL&P |  | Total Utility |  | Avista Utilities |  | AEL&P |  | Total Utility
ELECTRIC OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 74,818 |  |  | $ | 4,155 |  |  | $ | 78,973 |  |  | $ | 189,571 |  |  | $ | 10,693 |  |  | $ | 200,264 |
Commercial and governmental | 76,462 |  |  | 6,541 |  |  | 83,003 |  |  | 155,371 |  |  | 14,585 |  |  | 169,956 |
Industrial | 27,985 |  |  | — |  |  | 27,985 |  |  | 53,104 |  |  | — |  |  | 53,104 |
Public street and highway lighting | 1,899 |  |  | 63 |  |  | 1,962 |  |  | 3,758 |  |  | 131 |  |  | 3,889 |
Total retail revenue | 181,164 |  |  | 10,759 |  |  | 191,923 |  |  | 401,804 |  |  | 25,409 |  |  | 427,213 |
Transmission | 4,171 |  |  | — |  |  | 4,171 |  |  | 8,001 |  |  | — |  |  | 8,001 |
Other revenue from contracts with customers | 3,919 |  |  | — |  |  | 3,919 |  |  | 10,210 |  |  | — |  |  | 10,210 |
Total revenue from contracts with customers | $ | 189,254 |  |  | $ | 10,759 |  |  | $ | 200,013 |  |  | $ | 420,015 |  |  | $ | 25,409 |  |  | $ | 445,424 |
| Three months ended June 30, 2018 |  | Six months ended June 30, 2018
| Avista Utilities |  | AEL&P |  | Total Utility |  | Avista Utilities |  | AEL&P |  | Total Utility
NATURAL GAS OPERATIONS |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 30,767 |  |  | $ | — |  |  | $ | 30,767 |  |  | $ | 111,421 |  |  | $ | — |  |  | $ | 111,421 |
Commercial | 14,668 |  |  | — |  |  | 14,668 |  |  | 52,040 |  |  | — |  |  | 52,040 |
Industrial and interruptible | 1,078 |  |  | — |  |  | 1,078 |  |  | 2,761 |  |  | — |  |  | 2,761 |
Total retail revenue | 46,513 |  |  | — |  |  | 46,513 |  |  | 166,222 |  |  | — |  |  | 166,222 |
Transportation | 2,221 |  |  | — |  |  | 2,221 |  |  | 4,788 |  |  | — |  |  | 4,788 |
Other revenue from contracts with customers | 1,125 |  |  | — |  |  | 1,125 |  |  | 2,250 |  |  | — |  |  | 2,250 |
Total revenue from contracts with customers | $ | 49,859 |  |  | $ | — |  |  | $ | 49,859 |  |  | $ | 173,260 |  |  | $ | — |  |  | $ | 173,260 |
Unbilled Accounts Receivable [Table Text Block] | Accounts receivable includes unbilled energy revenues of the following amounts as of June 30, 2018 and December 31, 2017 (dollars in thousands):
| June 30, |  | December 31,
| 2018 |  | 2017
Unbilled accounts receivable | $ | 39,383 |  |  | $ | 68,641 |
Schedule Of Utilities Operating Revenue Expense Taxes [Table Text Block] | Utility-related taxes that were included in revenue from contracts with customers were as follows for the three and six months ended June 30 (dollars in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Utility-related taxes | $ | 12,986 |  |  | $ | 13,552 |  |  | $ | 32,153 |  |  | $ | 35,136 |

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