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Investments (Narrative) (Details)
£ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]                  
Money Market Investments $ 178,100,000         $ 178,100,000     $ 45,200,000
Payments to Acquire Marketable Securities           0 $ 7,499,000    
Cumulative realized gain (loss) on marketable securities           23,000,000.0 9,600,000    
Proceeds from sales of marketable equity securities           93,775,000 17,586,000    
Equity Method Investment Impairment     $ 3,600,000            
Cumulative undistributed income in investments in affiliates 29,400,000         29,400,000     25,600,000
Gain on sale of equity affiliates 0     $ 0   1,370,000 28,994,000    
Cost method investments 40,400,000         40,400,000     $ 38,500,000
Impairment of a cost method investment 0   2,600,000 0   2,577,000 0    
Gain on cost method investments 1,638,000 $ 2,600,000   3,669,000 $ 1,400,000 4,209,000 5,080,000    
Graham Healthcare Group [Member]                  
Schedule of Investments [Line Items]                  
Revenue from Related Parties $ 2,400,000     $ 2,400,000   $ 7,100,000 $ 7,000,000.0    
Intersection Holdings [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment, Ownership Percentage 12.00%         12.00%   12.00%  
Residential Home Health Illinois [Member] | Graham Healthcare Group [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment, Ownership Percentage 40.00%         40.00%   40.00%  
Residential Hospice Illinois [Member] | Graham Healthcare Group [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment, Ownership Percentage 42.50%         42.50%   42.50%  
Residential Healthcare Michigan hospital joint venture [Member] | Graham Healthcare Group [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment, Ownership Percentage 40.00%         40.00%   40.00%  
Celtic Healthcare Allegheny Health Network Joint Venture [Member] | Graham Healthcare Group [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment, Ownership Percentage 40.00%         40.00%   40.00%  
Framebridge [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment Impairment     $ 2,700,000            
Gimlet Media [Member]                  
Schedule of Investments [Line Items]                  
Gain on sale of equity affiliates         29,000,000.0        
Proceeds from Sale of Equity Method Investments         $ 33,500,000        
York Joint Venture [Member] | KIHL [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%