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Investments (Narrative) (Details)
$ in Thousands, £ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
investment
shares
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
investment
Sep. 30, 2022
USD ($)
investment
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
GBP (£)
investment
shares
Dec. 31, 2021
USD ($)
shares
Schedule of Investments [Line Items]              
Money Market Investments $ 5,300     $ 5,300     $ 0
Marketable equity securities 597,456     597,456     809,997
Payments to Acquire Marketable Securities       35,070 $ 48,036    
Cumulative realized gain on marketable securities       39,500 27,700    
Proceeds from sales of marketable equity securities       74,233 38,308    
Gain on sale of investment in affiliate 0   $ 0 604 0    
Cumulative undistributed income in investments in affiliates 54,500     54,500     52,500
Equity Method Investment Impairment     $ 6,600        
Number of Equity Method Investments Impaired | investment     1        
Cost method investments 54,900     54,900     $ 48,900
Gain on cost method investments $ 560   $ 0 $ 560 10,506    
Concentration in single marketable equity security [Member]              
Schedule of Investments [Line Items]              
Number of marketable equity securities greater than 5% of total assets | investment 0     0   0  
Equity Securities [Member] | Concentration in single marketable equity security [Member] | Assets, Total [Member]              
Schedule of Investments [Line Items]              
Minimum percentage of total assets considered as significant concentrations       5.00%      
Markel Corporation [Member]              
Schedule of Investments [Line Items]              
Number of Shares Held in Investment | shares 55,430     55,430   55,430 44,430
Marketable equity securities $ 60,100     $ 60,100     $ 54,800
Intersection Holdings [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage 12.00%     12.00%   12.00%  
Graham Healthcare Group [Member]              
Schedule of Investments [Line Items]              
Revenue from Related Parties $ 3,500   $ 2,800 $ 10,500 $ 8,000    
Graham Healthcare Group [Member] | Residential Home Health Illinois [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage 40.00%     40.00%   40.00%  
Graham Healthcare Group [Member] | Residential Hospice Illinois [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage 40.00%     40.00%   40.00%  
Gain on sale of investment in affiliate   $ 600          
Graham Healthcare Group [Member] | Residential And Michigan Hospital Joint Venture [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage 40.00%     40.00%   40.00%  
Graham Healthcare Group [Member] | Celtic Healthcare Allegheny Health Network Joint Venture [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage 40.00%     40.00%   40.00%  
Graham Healthcare Group [Member] | Residential Home Health Illinois and Residential Hospice Illinois [Member]              
Schedule of Investments [Line Items]              
Additional investment in equity affiliates   $ 18,500          
KIHL [Member] | York Joint Venture [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage 45.00%     45.00%   45.00%  
Cumulative payments for advance to affiliate | £           £ 22.0  
Loan Receivable, Payment Terms       25 years      
Loan Receivable Fixed Interest Rate       7.00%      
Advances to Affiliate | £           £ 20.4