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Investments (Narrative) (Details)
£ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
investment
shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
investment
Jun. 30, 2021
USD ($)
investment
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
GBP (£)
investment
shares
Dec. 31, 2020
USD ($)
shares
Schedule of Investments [Line Items]              
Money Market Investments $ 0     $ 0     $ 268,800,000
Marketable equity securities 751,440,000     751,440,000     573,102,000
Payments to Acquire Marketable Securities       48,036,000 $ 0    
Cumulative realized gain on marketable securities       27,700,000 23,000,000.0    
Proceeds from sales of marketable equity securities       37,629,000 93,775,000    
Cumulative undistributed income in investments in affiliates 41,600,000     41,600,000     26,100,000
Equity Method Investment Impairment     $ 3,600,000        
Number of Equity Method Investments Impaired | investment     2        
Cost method investments 45,100,000     45,100,000     $ 35,700,000
Gain on cost method investments 7,783,000 $ 2,571,000   10,506,000 2,571,000    
Impairment of cost method investments $ 0 0   $ 0 2,577,000    
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 44,430     44,430   44,430 28,000
Marketable equity securities $ 52,700,000     $ 52,700,000     $ 28,900,000
Intersection Holdings [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage 12.00%     12.00%   12.00%  
Framebridge [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment Impairment     $ 2,700,000        
Graham Healthcare Group [Member]              
Schedule of Investments [Line Items]              
Revenue from Related Parties $ 2,700,000 $ 2,200,000   $ 5,200,000 $ 4,700,000    
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 42.50%     42.50%   42.50%  
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%  
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%