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Investments (Narrative) (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
shares
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2019
GBP (£)
shares
Dec. 31, 2017
GBP (£)
Schedule of Investments [Line Items]                              
Money market investments $ 45,200,000       $ 75,500,000           $ 45,200,000 $ 75,500,000      
Marketable equity securities 585,080,000       496,390,000           585,080,000 496,390,000      
Cash paid for new marketable equity securities                     7,499,000 42,659,000 $ 0    
Cumulative realized gain (loss) on marketable securities                     9,500,000 37,300,000      
Proceeds from sales of marketable equity securities                     19,303,000 66,741,000 0    
Cumulative undistributed income in investments in affiliates 25,600,000       21,200,000           25,600,000 21,200,000      
Gain on sale of an equity affiliate                     28,994,000 0 0    
Equity in earnings (losses) of affiliates, net 3,835,000 $ 4,683,000 $ 1,467,000 $ 1,679,000 1,426,000 $ 9,537,000 $ 931,000   $ 2,579,000   11,664,000 14,473,000 (3,249,000)    
Equity Method Investment, Other than Temporary Impairment                   $ 2,800,000          
Equity Securities without Readily Determinable Fair Value, Amount $ 38,500,000       30,600,000           38,500,000 30,600,000      
Gains on cost method investments   $ 3,700,000   1,300,000 $ 3,200,000 8,500,000         5,080,000 11,663,000 $ 0    
Impairment loss on cost method investments                     $ 0 $ 2,697,000      
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 $ 32,000,000.0       $ 29,100,000           $ 32,000,000.0 $ 29,100,000      
Intersection [Member]                              
Schedule of Investments [Line Items]                              
Ownership percentage of investment in affiliate 12.00%                   12.00%     12.00%  
Gimlet Media [Member]                              
Schedule of Investments [Line Items]                              
Gain on sale of an equity affiliate       29,000,000.0                      
Proceeds from Sale of Equity Method Investments       $ 33,500,000                      
HomeHero [Member]                              
Schedule of Investments [Line Items]                              
Equity in earnings (losses) of affiliates, net           2,100,000                  
One Investment [Member]                              
Schedule of Investments [Line Items]                              
Equity in earnings (losses) of affiliates, net           $ 5,800,000                  
Graham Healthcare Group [Member]                              
Schedule of Investments [Line Items]                              
Revenue from Related Parties                     $ 9,300,000 $ 12,100,000      
Graham Healthcare Group [Member] | Residential Home Health Illinois [Member]                              
Schedule of Investments [Line Items]                              
Ownership percentage of investment in affiliate 40.00%                   40.00%     40.00%  
Graham Healthcare Group [Member] | Residential Hospice Illinois [Member]                              
Schedule of Investments [Line Items]                              
Ownership percentage of investment in affiliate 42.50%                   42.50%     42.50%  
Graham Healthcare Group [Member] | Residential And Michigan Hospital Joint Venture [Member]                              
Schedule of Investments [Line Items]                              
Ownership percentage of investment in affiliate 40.00%                   40.00%     40.00%  
Graham Healthcare Group [Member] | Celtic Healthcare Allegheny Health Network Joint Venture [Member]                              
Schedule of Investments [Line Items]                              
Ownership percentage of investment in affiliate 40.00%                   40.00%     40.00%  
KIHL [Member] | York Joint Venture [Member]                              
Schedule of Investments [Line Items]                              
Ownership percentage of investment in affiliate 45.00%                   45.00%     45.00%  
Loan commitment to affiliate | £                           £ 25,000,000  
Advances to Affiliate | £                           £ 22,000,000 £ 16,000,000
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%