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Investments (Tables)
 12 Months Ended
Dec. 31, 2020
Schedule of Investments [Abstract]  
Summary of debt and equity securities
The following tables summarize debt and equity securities at December 31, 2020 and 2019.
(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 

(dollars in thousands)
Gross Unrealized
2019CostGainsLossesFair Value
Equity$258,870 $144,832 $(5,990)$397,712 
Debt354,535 8,474 (874)362,135 
Other6,356 — — 6,356 
Total$619,761 $153,306 $(6,864)$766,203 
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, 2020 and 2019 are as follows:
(dollars in thousands)
20202019
CostFair ValueCostFair Value
Due within one year$163,890 $164,635 $81,637 $81,914 
Due after one year through five years242,958 247,857 47,212 48,188 
Due after five years through ten years68,659 73,479 51,892 54,184 
Due after ten years137,764 144,749 173,794 177,849 
Total$613,271 $630,720 $354,535 $362,135 
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, 2020, 2019 and 2018:
(dollars in thousands)
202020192018
Gross realized gains$36,647 $18,076 $14,268 
Gross realized losses(16,868)(12,018)(19,139)
Proceeds from sales756,513 544,043 626,612 
Schedule of investments in associated companies
Investments in associated companies were as follows at December 31, 2020 and 2019:
(dollars in thousands)
20202019
National Rural Utilities Cooperative Finance Corporation (CFC)$24,080 $24,065 
CT Parts, LLC6,554 7,175 
Georgia Transmission Corporation33,943 32,106 
Georgia System Operations
Corporation7,500 7,000 
Other2,767 2,972 
Total$74,844 $73,318