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Derivative Accounting - Narrative (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) Counterparty | Dec. 31, 2014 USD ($)
Derivative Accounting |  |
Percentage of deferred unrealized gains (losses) on contracts due to PSA recovery | 100.00% |
Designated as Hedging Instruments |  |
Derivative Accounting |  |
Gross recognized derivatives | $ 4,000 | $ 4,000
Commodity Contracts |  |
Derivative Accounting |  |
Gross recognized derivatives | $ 175,678 | 169,052
Concentration of credit risk, number of counterparties | Counterparty | 1 |
Concentration of risk with two counterparties, as a percentage of risk management assets | 81.00% |
Risk management activities-derivative instruments: Commodity Contracts | $ 33,235 | $ 31,405
Additional collateral to counterparties for energy related non-derivative instrument contracts | 161,000 |
Commodity Contracts | Designated as Hedging Instruments |  |
Derivative Accounting |  |
Estimated net gain (loss) before income taxes to be reclassified from accumulated other comprehensive income | $ (4,000) |
Arizona Public Service Company |  |
Derivative Accounting |  |
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment | 100.00% |

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