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Investments (Narrative) (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
GBP (£)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
GBP (£)
Schedule of Investments [Line Items]              
Money Market Investments   $ 65,000,000       $ 75,500,000  
Payments to Acquire Marketable Securities   7,499,000   $ 0      
Gain (loss) on marketable equity securities, net   9,700,000   28,500,000      
Proceeds from sales of marketable equity securities   17,200,000   50,500,000      
Proceeds From Sales Of Marketable Securities Settled $ 900,000            
Gain on sale of equity affiliate   28,994,000   0      
Equity Securities without Readily Determinable Fair Value   34,400,000       $ 30,600,000  
Graham Healthcare Group [Member]              
Schedule of Investments [Line Items]              
Revenue from Related Parties   $ 2,300,000   $ 3,700,000      
Intersection Holdings [Member]              
Schedule of Investments [Line Items]              
Equity Method Investment, Ownership Percentage   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%    
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%    
Gimlet Media [Member]              
Schedule of Investments [Line Items]              
Gain on sale of equity affiliate   $ 29,000,000          
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%    
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%