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Investments (Narrative) (Details)
$ in Thousands, £ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
investment
shares
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
investment
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
GBP (£)
investment
shares
Dec. 31, 2021
USD ($)
shares
Schedule of Investments [Line Items]              
Money Market Investments $ 17,800     $ 17,800     $ 0
Marketable equity securities 648,604     648,604     809,997
Payments to Acquire Marketable Securities       31,468 $ 48,036    
Cumulative realized gain on marketable securities       39,100 27,700    
Proceeds from sales of marketable equity securities       74,233 37,629    
Gain on sale of investment in affiliate 0   $ 0 604 0    
Cumulative undistributed income in investments in affiliates 54,300     54,300     52,500
Cost method investments 52,300     52,300     $ 48,900
Gain on cost method investments $ 0   7,783 $ 0 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 $ 71,700     $ 71,700     $ 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 $ 3,700   $ 2,700 $ 7,000 $ 5,200    
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%  
Advances to Affiliate | £           £ 22.0  
Loan Receivable, Payment Terms       25 years      
Loan Receivable Fixed Interest Rate       7.00%