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Investments (Narrative) (Details)
£ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]        
Money Market Investments $ 93,700,000     $ 45,200,000
Payments to Acquire Marketable Securities 0 $ 7,499,000    
Cumulative realized gain (loss) on marketable securities (2,000,000.0) 9,700,000    
Proceeds from sales of marketable equity securities 48,016,000 17,162,000    
Equity Method Investment Impairment 3,600,000      
Cumulative undistributed income in investments in affiliates 29,000,000.0     25,600,000
Income from Equity Method Investments (1,547,000) 1,679,000    
(Loss) gain on sale of an equity affiliate (103,000) 28,994,000    
Cost method investments 35,900,000     $ 38,500,000
Gain on cost method investments 0 1,411,000    
Impairment of a cost method investment 2,577,000 0    
Graham Healthcare Group [Member]        
Schedule of Investments [Line Items]        
Revenue from Related Parties $ 2,500,000 2,300,000    
Intersection Holdings [Member]        
Schedule of Investments [Line Items]        
Equity Method Investment, Ownership Percentage 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%  
Residential Hospice Illinois [Member] | Graham Healthcare Group [Member]        
Schedule of Investments [Line Items]        
Equity Method Investment, Ownership Percentage 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%  
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%  
Framebridge [Member]        
Schedule of Investments [Line Items]        
Equity Method Investment Impairment $ 2,700,000      
Gimlet Media [Member]        
Schedule of Investments [Line Items]        
(Loss) gain on sale of an equity affiliate   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%  
Advances to Affiliate | £     £ 22  
Loan Receivable, Payment Terms 25 years      
Loan Receivable Fixed Interest Rate 7.00%