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Investments - Investments in Debt and Equity Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cost    
Equity $ 323,907 $ 304,305
Debt 833,035 774,580
Other 10,445 19,102
Total 1,167,387 1,097,987
Gross Unrealized Gains    
Equity 159,445 280,127
Debt 372 4,859
Other 20 0
Total 159,837 284,986
Gross Unrealized Losses    
Equity (8,949) (4,682)
Debt (46,369) (7,001)
Other (9) (1)
Total (55,327) (11,684)
Fair Value    
Equity 474,403 579,750
Debt 787,038 772,438
Other 10,456 19,101
Total $ 1,271,897 $ 1,371,289