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Investments (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Investment
shares
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Investment
Dec. 31, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Dec. 31, 2020
USD ($)
Investment
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2020
GBP (£)
Investment
shares
Schedule of Investments [Line Items]                              
Money market investments $ 268,800       $ 45,200             $ 268,800 $ 45,200    
Marketable equity securities 573,102       585,080             573,102 585,080    
Payments to acquire marketable securities                       20,004 7,499 $ 42,659  
Cumulative realized gain on marketable securities                       23,000 9,500 37,300  
Proceeds from sales of marketable equity securities                       93,775 19,303 66,741  
Cumulative undistributed income in investments in affiliates 26,100       25,600             26,100 25,600    
Equity Method Investment Impairment       $ 3,600               $ 3,600      
Number of investments in affiliates impaired | Investment       2               2      
Gain on sale of an equity affiliate                       $ 1,370 28,994 0  
Equity in earnings of affiliates, net 2,937 $ 4,092 $ 1,182 $ (1,547) 3,835 $ 4,683 $ 1,467 $ 1,679       6,664 11,664 14,473  
Cost method investments 35,700       $ 38,500             35,700 38,500    
Net gain on cost method investments   $ 1,600 $ 2,600     $ 3,700   1,300 $ 3,200 $ 8,500   4,209 5,080 11,663  
Impairment of a cost method investment $ 4,800     2,600               $ 7,327 $ 0 2,697  
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
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 28,000       28,000             28,000 28,000   28,000
Marketable equity securities $ 28,900       $ 32,000             $ 28,900 $ 32,000    
Intersection [Member]                              
Schedule of Investments [Line Items]                              
Equity Method Investment, Ownership Percentage 12.00%                     12.00%     12.00%
Gimlet Media [Member]                              
Schedule of Investments [Line Items]                              
Gain on sale of an equity affiliate               29,000              
Proceeds from Sale of Equity Method Investments               $ 33,500              
HomeHero [Member]                              
Schedule of Investments [Line Items]                              
Equity in earnings of affiliates, net                   2,100          
One Investment [Member]                              
Schedule of Investments [Line Items]                              
Equity in earnings of affiliates, net                   $ 5,800          
Framebridge [Member]                              
Schedule of Investments [Line Items]                              
Equity Method Investment Impairment       $ 2,700                      
Graham Healthcare Group [Member]                              
Schedule of Investments [Line Items]                              
Revenue from Related Parties                       $ 9,600 $ 9,300 $ 12,100  
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%
Loan commitment to affiliate | £                             £ 25,000,000
Advances to Affiliate | £                             £ 22,000,000
Payments to Fund Long-term Loans to Related Parties | £                     £ 6,000,000        
Loan Receivable, Payment Term                       25 years      
Loan Receivable Fixed Interest Rate                       7.00%