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Derivatives And Risk Management (Tables) | 3 Months Ended
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Mar. 31, 2018
Derivative Instruments and Hedges, Assets [Abstract] |
Energy Commodity Derivatives | The following table presents the underlying energy commodity derivative volumes as of March 31, 2018 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):
| Purchases |  | Sales
| Electric Derivatives |  | Gas Derivatives |  | Electric Derivatives |  | Gas Derivatives
Year | Physical (1) MWh |  | Financial (1) MWh |  | Physical (1) mmBTUs |  | Financial (1) mmBTUs |  | Physical (1) MWh |  | Financial (1) MWh |  | Physical (1) mmBTUs |  | Financial (1) mmBTUs
Remainder 2018 | 246 |  |  | 816 |  |  | 13,783 |  |  | 86,103 |  |  | 162 |  |  | 1,537 |  |  | 7,683 |  |  | 58,035 |
2019 | 235 |  |  | 737 |  |  | 610 |  |  | 65,478 |  |  | 94 |  |  | 1,543 |  |  | 1,345 |  |  | 35,438 |
2020 | — |  |  | — |  |  | 910 |  |  | 23,145 |  |  | — |  |  | 836 |  |  | 1,430 |  |  | 1,830 |
2021 | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,049 |  |  | — |
2022 | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Thereafter | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
The following table presents the underlying energy commodity derivative volumes as of December 31, 2017 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):
| Purchases |  | Sales
| Electric Derivatives |  | Gas Derivatives |  | Electric Derivatives |  | Gas Derivatives
Year | Physical (1) MWh |  | Financial (1) MWh |  | Physical (1) mmBTUs |  | Financial (1) mmBTUs |  | Physical (1) MWh |  | Financial (1) MWh |  | Physical (1) mmBTUs |  | Financial (1) mmBTUs
2018 | 426 |  |  | 763 |  |  | 10,572 |  |  | 107,580 |  |  | 213 |  |  | 1,739 |  |  | 3,643 |  |  | 67,375 |
2019 | 235 |  |  | 737 |  |  | 610 |  |  | 61,073 |  |  | 94 |  |  | 1,420 |  |  | 1,345 |  |  | 35,438 |
2020 | — |  |  | — |  |  | 910 |  |  | 16,590 |  |  | — |  |  | 589 |  |  | 1,430 |  |  | 915 |
2021 | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,049 |  |  | — |
2022 | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Thereafter | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Foreign Currency Exchange Contracts | The following table summarizes the foreign currency exchange derivatives that Avista Corp. has outstanding as of March 31, 2018 and December 31, 2017 (dollars in thousands):
| March 31, |  | December 31,
| 2018 |  | 2017
Number of contracts | 23 |  |  | 18 |
Notional amount (in United States dollars) | $ | 5,312 |  |  | $ | 2,552 |
Notional amount (in Canadian dollars) | 6,866 |  |  | 3,241 |
Interest Rate Swap Agreements | The following table summarizes the unsettled interest rate swap derivatives that Avista Corp. has outstanding as of March 31, 2018 and December 31, 2017 (dollars in thousands):
Balance Sheet Date |  | Number of Contracts |  | Notional Amount |  | Mandatory Cash Settlement Date
March 31, 2018 |  | 14 |  | $ | 275,000 |  |  | 2018
|  | 6 |  | 70,000 |  |  | 2019
|  | 4 |  | 40,000 |  |  | 2020
|  | 1 |  | 15,000 |  |  | 2021
|  | 5 |  | 60,000 |  |  | 2022
December 31, 2017 |  | 14 |  | $ | 275,000 |  |  | 2018
|  | 6 |  | 70,000 |  |  | 2019
|  | 3 |  | 30,000 |  |  | 2020
|  | 1 |  | 15,000 |  |  | 2021
|  | 5 |  | 60,000 |  |  | 2022
Derivative Instruments Summary | The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of March 31, 2018 (in thousands):
|  | Fair Value
Derivative and Balance Sheet Location |  | Gross Asset |  | Gross Liability |  | Collateral Netted |  | Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives |  |  |  |  |  |  |  |
Other current assets |  | $ | 22 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | 16 |
Interest rate swap derivatives |  |  |  |  |  |  |  |
Other current assets |  | 3,930 |  |  | — |  |  | — |  |  | 3,930 |
Other property and investments-net and other non-current assets |  | 9,512 |  |  | (358 | ) |  | — |  |  | 9,154 |
Current unsettled interest rate swap derivative liabilities |  | 1,273 |  |  | (49,052 | ) |  | 22,693 |  |  | (25,086 | )
Other non-current liabilities, regulatory liabilities and deferred credits |  | — |  |  | (6,321 | ) |  | 4,937 |  |  | (1,384 | )
Energy commodity derivatives |  |  |  |  |  |  |  |
Other current assets |  | 995 |  |  | (34 | ) |  | — |  |  | 961 |
Current energy commodity derivative liabilities |  | 39,944 |  |  | (61,978 | ) |  | 12,274 |  |  | (9,760 | )
Other non-current liabilities, regulatory liabilities and deferred credits |  | 19,133 |  |  | (28,226 | ) |  | 4,322 |  |  | (4,771 | )
Total derivative instruments recorded on the balance sheet |  | $ | 74,809 |  |  | $ | (145,975 | ) |  | $ | 44,226 |  |  | $ | (26,940 | )
The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2017 (in thousands):
|  | Fair Value
Derivative and Balance Sheet Location |  | Gross Asset |  | Gross Liability |  | Collateral Netted |  | Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives |  |  |  |  |  |  |  |
Other current assets |  | $ | 32 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | 31 |
Interest rate swap derivatives |  |  |  |  |  |  |  |
Other current assets |  | 2,597 |  |  | (270 | ) |  | — |  |  | 2,327 |
Other property and investments-net and other non-current assets |  | 4,880 |  |  | (2,304 | ) |  | — |  |  | 2,576 |
Current unsettled interest rate swap derivative liabilities |  | — |  |  | (63,399 | ) |  | 28,952 |  |  | (34,447 | )
Other non-current liabilities, regulatory liabilities and deferred credits |  | — |  |  | (7,540 | ) |  | 6,018 |  |  | (1,522 | )
Energy commodity derivatives |  |  |  |  |  |  |  |
Other current assets |  | 1,386 |  |  | (122 | ) |  | — |  |  | 1,264 |
Current energy commodity derivative liabilities |  | 26,641 |  |  | (52,895 | ) |  | 17,406 |  |  | (8,848 | )
Other non-current liabilities, regulatory liabilities and deferred credits |  | 15,970 |  |  | (34,936 | ) |  | 10,032 |  |  | (8,934 | )
Total derivative instruments recorded on the balance sheet |  | $ | 51,506 |  |  | $ | (161,467 | ) |  | $ | 62,408 |  |  | $ | (47,553 | )
Schedule of Assets Pledged as Collateral and Related Offsets [Table Text Block] | The following table presents Avista Corp.'s collateral outstanding related to its derivative instruments as of March 31, 2018 and December 31, 2017 (in thousands):
| March 31, |  | December 31,
| 2018 |  | 2017
Energy commodity derivatives |  |  |
Cash collateral posted | $ | 28,415 |  |  | $ | 39,458 |
Letters of credit outstanding | 28,500 |  |  | 23,000 |
Balance sheet offsetting (cash collateral against net derivative positions) | 16,596 |  |  | 27,438 |
Interest rate swap derivatives |  |  |
Cash collateral posted | 27,630 |  |  | 34,970 |
Letters of credit outstanding | 3,000 |  |  | 5,000 |
Balance sheet offsetting (cash collateral against net derivative positions) | 27,630 |  |  | 34,970 |
Certain of Avista Corp.’s derivative instruments contain provisions that require Avista Corp. to maintain an "investment grade" credit rating from the major credit rating agencies. If Avista Corp.’s credit ratings were to fall below "investment grade," it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions. The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position and the amount of additional collateral Avista Corp. could be required to post as of March 31, 2018 and December 31, 2017 (in thousands):
| March 31, |  | December 31,
| 2018 |  | 2017
Energy commodity derivatives |  |  |
Liabilities with credit-risk-related contingent features | $ | 1,376 |  |  | $ | 1,336 |
Additional collateral to post | 1,376 |  |  | 1,336 |
Interest rate swap derivatives |  |  |
Liabilities with credit-risk-related contingent features | 55,731 |  |  | 73,514 |
Additional collateral to post | 8,600 |  |  | 18,770 |

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