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Derivative Accounting - Narrative (Details) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Derivative Accounting |  |  |  |
Derivative liability | $ 87,361,000 | $ 87,361,000 |  | $ 72,132,000
Commodity Contracts |  |  |  |
Derivative Accounting |  |  |  |
Derivative liability | 87,361,000 | 87,361,000 |  | $ 72,132,000
Additional collateral to counterparties for energy related non-derivative instrument contracts | $ 97,000,000 | 97,000,000 |  |
Commodity Contracts | Designated as Hedging Instruments |  |  |  |
Derivative Accounting |  |  |  |
Amount reclassified from accumulated other comprehensive income to earnings related to discontinued cash flow hedges |  | 0 | $ 0 |
Estimated loss before income taxes to be reclassified from accumulated other comprehensive income |  | $ 300,000 |  |
APS |  |  |  |
Derivative Accounting |  |  |  |
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment | 100.00% | 100.00% |  |
Risk Management Assets | Credit Concentration Risk |  |  |  |
Derivative Accounting |  |  |  |
Concentration risk | 22.00% |  |  |

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for non-derivative instruments with credit-risk related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References No definition available. + Details
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