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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Fair value of APS's nuclear decommissioning trust fund assets The following tables present the unrealized gains and losses based on the original cost of the investment and summarizes the fair value of APS's nuclear decommissioning trust and other special use fund assets at December 31, 2018 and December 31, 2017 (dollars in thousands): 

December 31, 2018
 
Fair Value

Total
Unrealized
Gains

Total
Unrealized
Losses
Investment Type:
Nuclear Decommissioning Trusts

Other Special Use Funds

Total


Equity Securities
$
402,008


$
45,130


$
447,138


$
222,147


$
(459
)
Available for Sale-Fixed Income Securities
446,978


190,378


637,356

(a)
8,634


(6,778
)
Other
2,148


593


2,741

(b)
—


—

Total
$
851,134


$
236,101


$
1,087,235


$
230,781


$
(7,237
)
(a)
As of December 31, 2018, the amortized cost basis of these available-for-sale investments is $635 million
(b)
Represents net pending securities sales and purchases.


December 31, 2017
 
Fair Value

Total
Unrealized
Gains

Total
Unrealized
Losses
Investment Type:
Nuclear Decommissioning Trusts

Other Special Use Funds

Total


Equity Securities
$
424,614


$
430


$
425,044


$
248,623


$
—

Available for Sale-Fixed Income Securities
446,277


29,439


475,716

(a)
11,537


(2,996
)
Other
109


489


598

(b)
—


—

Total
$
871,000


$
30,358


$
901,358


$
260,160


$
(2,996
)
(a)
As of December 31, 2017, the amortized cost basis of these available-for-sale investments is $467 million.
(b)
Represents net pending securities sales and purchases.
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds following table sets forth APS's realized gains and losses relating to the sale and maturity of available-for-sale debt securities and equity securities, and the proceeds from the sale and maturity of these investment securities for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):
 
 
Year Ended December 31,
 
Nuclear Decommissioning Trusts

Other Special Use Funds

Total
2018








Realized gains
$
6,679


$
1


$
6,680

Realized losses
(13,552
)

—


(13,552
)
Proceeds from the sale of securities (a)
554,385


98,648


653,033

2017








Realized gains
21,813


17


21,830

Realized losses
(13,146
)

(9
)

(13,155
)
Proceeds from the sale of securities (a)
542,246


4,093


546,339

2016








Realized gains
11,213


—


11,213

Realized losses
(10,106
)

—


(10,106
)
Proceeds from the sale of securities (a)
633,410


—


633,410

(a)
Proceeds are reinvested in the nuclear decommissioning trusts or other special use funds.
    
Fair value of fixed income securities, summarized by contractual maturities The fair value of fixed income securities, summarized by contractual maturities, at December 31, 2018 is as follows (dollars in thousands):
 
 
Nuclear Decommissioning

Coal Reclamation Escrow Accounts

Active Union Medical Trust

Total
Less than one year
$
26,819


$
21,237


$
39,966


$
88,022

1 year – 5 years
97,566


15,658


104,128


217,352

5 years – 10 years
128,379


2,511


—


130,890

Greater than 10 years
194,214


6,878


—


201,092

Total
$
446,978


$
46,284


$
144,094


$
637,356