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Investments in debt and equity securities - Gross Unrealized Losses on Investments and Fair Values of Related Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Losses    
Less than 12 months $ 21,218 $ 2,099
More than 12 months 14,254 613
Total 35,472 2,712
Fair values    
Less than 12 months 432,053 161,781
More than 12 months 146,148 15,916
Total 578,201 177,697
Municipal    
Losses    
Less than 12 months 262 1
More than 12 months 10 0
Total 272 1
Fair values    
Less than 12 months 27,491 130
More than 12 months 67 0
Total 27,558 130
Corporate    
Losses    
Less than 12 months 12,935 588
More than 12 months 5,600 456
Total 18,535 1,044
Fair values    
Less than 12 months 193,239 42,231
More than 12 months 44,342 12,014
Total 237,581 54,245
Foreign    
Losses    
Less than 12 months 7,608 1,502
More than 12 months 8,604 140
Total 16,212 1,642
Fair values    
Less than 12 months 186,221 118,943
More than 12 months 101,294 3,394
Total 287,515 122,337
U.S. Treasury Bonds    
Losses    
Less than 12 months 413 8
More than 12 months 40 17
Total 453 25
Fair values    
Less than 12 months 25,102 477
More than 12 months 445 508
Total $ 25,547 $ 985