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Investments (Tables)
 12 Months Ended
Dec. 31, 2022
Schedule of Investments [Abstract]  
Summary of debt and equity securities
The following tables summarize debt and equity securities at December 31, 2022 and 2021.
(dollars in thousands)
Gross Unrealized
2022CostGainsLossesFair Value
Equity$323,907 $159,445 $(8,949)$474,403 
Debt833,035 372 (46,369)787,038 
Other10,445 20 (9)10,456 
Total$1,167,387 $159,837 $(55,327)$1,271,897 
(dollars in thousands)
Gross Unrealized
2021CostGainsLossesFair Value
Equity$304,305 $280,127 $(4,682)$579,750 
Debt774,580 4,859 (7,001)772,438 
Other19,102 — (1)19,101 
Total$1,097,987 $284,986 $(11,684)$1,371,289 
Schedule of contractual maturities of debt securities The contractual maturities of debt securities, which are included in the estimated fair value table above, at December 31, 2022 and 2021 are as follows:
(dollars in thousands)
20222021
CostFair ValueCostFair Value
Due within one year$367,199 $353,180 $223,933 $222,307 
Due after one year through five years293,523 275,073 371,060 368,574 
Due after five years through ten years66,255 62,576 62,679 62,639 
Due after ten years106,058 96,209 116,908 118,918 
Total$833,035 $787,038 $774,580 $772,438 
Summary of realized gains and losses and proceeds from sales of securities The following table summarizes the realized gains and losses and proceeds from sales of securities for the years ended December 31, 2022, 2021 and 2020:
(dollars in thousands)
202220212020
Gross realized gains$10,029 $33,501 $36,647 
Gross realized losses(31,979)(19,985)(16,868)
Proceeds from sales301,128 913,600 756,513 
Schedule of investments in associated companies Investments in associated companies were as follows at December 31, 2022 and 2021:
(dollars in thousands)
20222021
National Rural Utilities Cooperative Finance Corporation (CFC)$24,081 $24,081 
CT Parts, LLC6,574 7,049 
Georgia Transmission Corporation38,287 35,696 
Georgia System Operations Corporation7,750 6,500 
Other2,245 2,500 
Total$78,937 $75,826