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Investments (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
GBP (£)
Schedule of Investments [Line Items]                  
Money Market Investments $ 71,000,000.0       $ 71,000,000.0     $ 75,500,000  
Payments to Acquire Marketable Securities         7,499,000 $ 0      
Gain on marketable equity securities, net         9,700,000 37,300,000      
Proceeds from sales of marketable equity securities         17,162,000 66,741,000      
Gain on sale of equity affiliate 0   $ 0   28,994,000 0      
Equity Securities without Readily Determinable Fair Value 34,500,000       34,500,000     $ 30,600,000  
Graham Healthcare Group [Member]                  
Schedule of Investments [Line Items]                  
Revenue from Related Parties $ 2,300,000   $ 3,300,000   $ 4,600,000 $ 7,000,000.0      
Intersection Holdings [Member]                  
Schedule of Investments [Line Items]                  
Equity Method Investment, Ownership Percentage 11.00%       11.00%   11.00%    
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%    
Gimlet Media [Member]                  
Schedule of Investments [Line Items]                  
Gain on sale of 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%   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 Terms         25 years        
Loan Receivable Fixed Interest Rate         7.00%