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Investments (Narrative) (Details)
£ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
investment
Mar. 31, 2020
USD ($)
investment
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
investment
Dec. 31, 2022
GBP (£)
shares
Schedule of Investments [Line Items]                
Money market investments         $ 7,700,000 $ 0    
Marketable equity securities         609,921,000 809,997,000    
Investments in Marketable Securities         42,100,000      
Payments to acquire marketable securities         40,518,000 48,036,000 $ 20,004,000  
Cumulative realized gain on marketable securities         58,100,000 46,000,000 23,000,000  
Proceeds from sales of marketable equity securities         102,040,000 65,499,000 93,775,000  
Gain on sale of investment in affiliate         604,000 0 1,370,000  
Cumulative undistributed income in investments in affiliates         49,100,000 52,500,000    
Equity Method Investment Impairment     $ 6,600,000 $ 3,600,000   6,600,000 $ 3,600,000  
Number of Equity Method Investments Impaired | investment     1 2     2  
Investments in Affiliates         186,419,000 155,444,000    
Cost method investments         66,700,000 48,900,000    
Net gain on cost method investments         6,883,000 11,756,000 $ 4,209,000  
Impairment of a cost method investment         $ 1,305,000 $ 0 7,327,000  
Subsequent Event [Member]                
Schedule of Investments [Line Items]                
Portion of 2022 investments in marketable equity securities that settled in January 2023 $ 1,500,000              
Equity securities [Member] | Concentration in single marketable equity security [Member] | Total Assets [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 44,430   55,430
Marketable equity securities         $ 73,000,000 $ 54,800,000    
Berkshire Hathaway [Member]                
Schedule of Investments [Line Items]                
Marketable equity securities         $ 347,000,000      
Berkshire Hathaway [Member] | Class A Common Stock [Member]                
Schedule of Investments [Line Items]                
Number of shares held in investment | shares         422     422
Berkshire Hathaway [Member] | Class B Common Stock [Member]                
Schedule of Investments [Line Items]                
Number of shares held in investment | shares         482,945     482,945
N2K Networks [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Diluted Ownership Percentage         49.90%     49.90%
Intersection [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage         12.00%     12.00%
Framebridge [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment Impairment       $ 2,700,000        
Private Equity Fund Investment [Member]                
Schedule of Investments [Line Items]                
Investments in Affiliates         $ 68,900,000 72,800,000    
Private Equity Fund Investment [Member] | Minimum [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage         4.00%     4.00%
Private Equity Fund Investment [Member] | Maximum [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage         10.00%     10.00%
Graham Healthcare Group [Member]                
Schedule of Investments [Line Items]                
Revenue from Related Parties         $ 13,900,000 $ 10,900,000 $ 9,600,000  
Graham Healthcare Group [Member] | Residential Home Health Illinois [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage         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%
Gain on sale of investment in affiliate   $ 600,000            
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%
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%
Graham Healthcare Group [Member] | Residential Home Health Illinois and Residential Hospice Illinois [Member]                
Schedule of Investments [Line Items]                
Additional investment in equity affiliates   $ 18,500,000            
KIHL [Member] | York Joint Venture [Member]                
Schedule of Investments [Line Items]                
Equity Method Investment, Ownership Percentage         45.00%     45.00%
Cumulative Payments For Advance to Affiliate | £               £ 22.0
Loan Receivable, Payment Term         25 years      
Loan Receivable Fixed Interest Rate         7.00%      
Advances to Affiliate | £               £ 20.4