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Fair Value (Tables)
12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis
Fair Value Measurements at Reporting Date Using
December 31, 2022Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable Inputs
(Level 3)
(dollars in thousands)
Nuclear decommissioning trust funds:
Domestic equity$204,129 $204,129 $— $— 
International equity trust$111,266 — 111,266 — 
Corporate bonds and debt$60,806 — 60,788 18 
US Treasury securities$49,775 49,775 — — 
Mortgage backed securities$41,210 — 41,210 — 
Domestic mutual funds$57,348 57,348 — — 
Federal agency securities$2,037 — 2,037 — 
Non-US Gov't bonds & private placements$2,890 — 2,890 — 
International mutual funds$653 — 653 — 
Other$10,602 10,602 — — 
Long-term investments:
International equity trust$33,606 — 33,606 — 
Corporate bonds and debt$10,473 — 10,473 — 
US Treasury securities$15,488 15,488 — — 
Mortgage backed securities$12,113 — 12,113 — 
Domestic mutual funds$302,302 302,302 — — 
Treasury STRIPS$293,281 — 293,281 — 
Non-US Gov't bonds & private placements$1,976 — 1,976 — 
Other$240 240 — — 
Short-term investments: Treasury STRIPS$61,702 — 61,702 — 
Natural gas swaps$131,804 — 131,804 — 
Fair Value Measurements at Reporting Date Using
December 31, 2021Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
(dollars in thousands)
Nuclear decommissioning trust funds:
Domestic equity$249,999 $249,999 $— $— 
International equity trust$140,718 — 140,718 — 
Corporate bonds and debt$72,936 — 72,369 567 
US Treasury securities$53,321 53,321 — — 
Mortgage backed securities$40,460 — 40,460 — 
Domestic mutual funds$75,384 75,384 — — 
Municipal bonds$1,133 — 1,133 — 
Federal agency securities$9,608 — 9,608 — 
Other$16,351 13,623 2,728 — 
Long-term investments:
International equity trust$35,873 — 35,873 — 
Corporate bonds and debt$14,022 — 12,656 1,366 
US Treasury securities$15,259 15,259 — — 
Mortgage backed securities$12,021 — 12,021 — 
Domestic mutual funds$277,937 277,937 — — 
Federal agency securities$257 — 257 — 
Treasury STRIPS$350,532 — 350,532 — 
Other$5,478 5,478 — — 
Natural gas swaps$63,994 — 63,994 — 
Schedule of estimated fair values of long-term debt, including current maturities The estimated fair values of our long-term debt, including current maturities at December 31, 2022 and 2021 were as follows:
20222021
(in thousands)
Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
Long-term debt$11,940,359 $10,194,954 $10,915,054 $12,741,046