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Nuclear Decommissioning Trusts (Tables) | 3 Months Ended
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Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Fair value of APS's nuclear decommissioning trust fund assets | The following table includes the unrealized gains and losses based on the original cost of the investment and summarizes the fair value of APS’s nuclear decommissioning trust fund assets at March 31, 2017 and December 31, 2016 (dollars in thousands):
| Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
March 31, 2017 |  |  |  |  |  |  |  |
Equity securities | $ | 374,695 |  |  | $ | 207,708 |  |  | $ | — |
Fixed income securities | 430,016 |  |  | 10,022 |  |  | (3,963 | )
Net receivables (a) | 337 |  |  | — |  |  | — |
Total | $ | 805,048 |  |  | $ | 217,730 |  |  | $ | (3,963 | )
| Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
December 31, 2016 |  |  |  |  |  |  |  |
Equity securities | $ | 353,261 |  |  | $ | 188,091 |  |  | $ | — |
Fixed income securities | 425,530 |  |  | 9,820 |  |  | (4,962 | )
Net receivables (a) | 795 |  |  | — |  |  | — |
Total | $ | 779,586 |  |  | $ | 197,911 |  |  | $ | (4,962 | )
(a) | Net receivables/payables relate to pending purchases and sales of securities.
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds | The following table sets forth approximate gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds (dollars in thousands):
| Three Months Ended March 31,
| 2017 |  | 2016
Realized gains | $ | 2,367 |  |  | $ | 2,438 |
Realized losses | (2,453 | ) |  | (1,786 | )
Proceeds from the sale of securities (a) | 151,126 |  |  | 141,809 |
(a) | Proceeds are reinvested in the trust.
Fair value of fixed income securities, summarized by contractual maturities | The fair value of fixed income securities, summarized by contractual maturities, at March 31, 2017 is as follows (dollars in thousands):
| Fair Value
Less than one year | $ | 12,143 |
1 year – 5 years | 117,217 |
5 years – 10 years | 114,131 |
Greater than 10 years | 186,525 |
Total | $ | 430,016 |

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