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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)
6 Months Ended
Jun. 30, 2019
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 June 30, 2019 and December 31, 2018 (dollars in thousands):  
 
June 30, 2019
 
Fair Value
 
Total
Unrealized
Gains
 
Total
Unrealized
Losses
Investment Type:
Nuclear Decommissioning Trust
 
Other Special Use Funds
 
Total
 
 
Equity securities
$
474,694

 
$
13,200

 
$
487,894

 
$
291,295

 
$

Available for sale-fixed income securities
469,089

 
227,361

 
696,450

(a)
24,638

 
(696
)
Other
6,665

 
997

 
7,662

(b)

 

Total
$
950,448

 
$
241,558

 
$
1,192,006

 
$
315,933

 
$
(696
)

(a)
As of June 30, 2019, the amortized cost basis of these available-for-sale investments is $672 million.
(b)
Represents net pending securities sales and purchases.

 
December 31, 2018
 
Fair Value
 
Total
Unrealized
Gains
 
Total
Unrealized
Losses
Investment Type:
Nuclear Decommissioning Trust
 
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.
    
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
The 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 three and six months ended June 30, 2019 and 2018 (dollars in thousands):
 
Three Months Ended June 30,
 
Nuclear Decommissioning Trust
 
Other Special Use Funds
 
Total
2019
 
 
 
 
 
Realized gains
$
2,643

 
$

 
$
2,643

Realized losses
(1,700
)
 

 
(1,700
)
Proceeds from the sale of securities (a)
93,559

 
36,747

 
130,306

2018
 
 
 
 
 
Realized gains
$
1,484

 
$

 
$
1,484

Realized losses
(2,978
)
 

 
(2,978
)
Proceeds from the sale of securities (a)
122,790

 
2,426

 
125,216


(a)
Proceeds are reinvested in the nuclear decommissioning trust and coal reclamation escrow account.

 
Six Months Ended June 30,
 
Nuclear Decommissioning Trust
 
Other Special Use Funds
 
Total
2019
 
 
 
 
 
Realized gains
$
3,746

 
$

 
$
3,746

Realized losses
(3,105
)
 

 
(3,105
)
Proceeds from the sale of securities (a)
216,152

 
93,202

 
309,354

2018
 
 
 
 
 
Realized gains
$
2,298

 
$
1

 
$
2,299

Realized losses
(5,025
)
 

 
(5,025
)
Proceeds from the sale of securities (a)
253,246

 
4,981

 
258,227



(a)
Proceeds are reinvested in the nuclear decommissioning trust and coal reclamation escrow account.

     The fair value of APS's fixed income securities, summarized by contractual maturities, at June 30, 2019, is as follows (dollars in thousands):
 
Nuclear Decommissioning Trust (a)
 
Coal Reclamation Escrow Account
 
Active Union Medical Trust
 
Total
Less than one year
$
37,373

 
$
22,253

 
$
40,219

 
$
99,845

1 year – 5 years
126,745

 
17,449

 
140,569

 
284,763

5 years – 10 years
113,989

 
1,807

 

 
115,796

Greater than 10 years
190,982

 
5,064

 

 
196,046

Total
$
469,089

 
$
46,573

 
$
180,788

 
$
696,450


(a)
Includes certain fixed income investments that are not due at a single maturity date. These investments have been allocated within the table based on the final payment date of the instrument.
Fair value of fixed income securities, summarized by contractual maturities
     The fair value of APS's fixed income securities, summarized by contractual maturities, at June 30, 2019, is as follows (dollars in thousands):
 
Nuclear Decommissioning Trust (a)
 
Coal Reclamation Escrow Account
 
Active Union Medical Trust
 
Total
Less than one year
$
37,373

 
$
22,253

 
$
40,219

 
$
99,845

1 year – 5 years
126,745

 
17,449

 
140,569

 
284,763

5 years – 10 years
113,989

 
1,807

 

 
115,796

Greater than 10 years
190,982

 
5,064

 

 
196,046

Total
$
469,089

 
$
46,573

 
$
180,788

 
$
696,450


(a)
Includes certain fixed income investments that are not due at a single maturity date. These investments have been allocated within the table based on the final payment date of the instrument.