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Investments (Tables)
 12 Months Ended
Dec. 31, 2021
Schedule of Investments [Abstract]  
Summary of debt and equity securities
The following tables summarize debt and equity securities at December 31, 2021 and 2020.
(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 
(dollars in thousands)
Gross Unrealized
2020CostGainsLossesFair Value
Equity$262,564 $219,658 $(8,127)$474,095 
Debt613,271 18,090 (641)630,720 
Other11,431 — — 11,431 
Total$887,266 $237,748 $(8,768)$1,116,246 
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, 2021 and 2020 are as follows:
(dollars in thousands)
20212020
CostFair ValueCostFair Value
Due within one year$223,933 $222,307 $163,890 $164,635 
Due after one year through five years371,060 368,574 242,958 247,857 
Due after five years through ten years62,679 62,639 68,659 73,479 
Due after ten years116,908 118,918 137,764 144,749 
Total$774,580 $772,438 $613,271 $630,720 
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, 2021, 2020 and 2019:
(dollars in thousands)
202120202019
Gross realized gains$33,501 $36,647 $18,076 
Gross realized losses(19,985)(16,868)(12,018)
Proceeds from sales913,600 756,513 544,043 
Schedule of investments in associated companies Investments in associated companies were as follows at December 31, 2021 and 2020:
(dollars in thousands)
20212020
National Rural Utilities Cooperative Finance Corporation (CFC)$24,081 $24,080 
CT Parts, LLC7,049 6,554 
Georgia Transmission Corporation35,696 33,943 
Georgia System Operations Corporation6,500 7,500 
Other2,500 2,767 
Total$75,826 $74,844