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Investments (Narrative) (Details) 1 - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2008
50% [Domain] [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo            
Weighting of EBITDA Multiple Method versus DCF Method 50.00%     50.00%    
50% [Domain] [Domain] | DCF Method for Fair Value Estimate [Member] | 7.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 60,900,000     $ 60,900,000    
50% [Domain] [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 71,700,000     71,700,000    
50% [Domain] [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 77,100,000     77,100,000    
50% [Domain] [Domain] | DCF Method for Fair Value Estimate [Member] | 11.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 82,400,000     82,400,000    
50% [Domain] [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 66,300,000     $ 66,300,000    
40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo            
Weighting of EBITDA Multiple Method versus DCF Method 40.00%     40.00%    
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 7.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 58,400,000     $ 58,400,000    
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 71,400,000     71,400,000    
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 77,800,000     77,800,000    
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 84,300,000     84,300,000    
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 64,900,000     $ 64,900,000    
30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo            
Weighting of EBITDA Multiple Method versus DCF Method 30.00%     30.00%    
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 7.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 56,000,000.0     $ 56,000,000.0    
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 71,000,000.0     71,000,000.0    
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 78,600,000     78,600,000    
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 86,100,000     86,100,000    
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 63,500,000     $ 63,500,000    
20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo            
Weighting of EBITDA Multiple Method versus DCF Method 20.00%     20.00%    
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 7.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 53,500,000     $ 53,500,000    
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 70,700,000     70,700,000    
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 79,300,000     79,300,000    
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 87,900,000     87,900,000    
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 62,100,000     $ 62,100,000    
10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo            
Weighting of EBITDA Multiple Method versus DCF Method 10.00%     10.00%    
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 7.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 51,000,000.0     $ 51,000,000.0    
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 70,400,000     70,400,000    
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 80,000,000.0     80,000,000.0    
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 89,700,000     89,700,000    
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 60,700,000     $ 60,700,000    
0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo            
Weighting of EBITDA Multiple Method versus DCF Method 0.00%     0.00%    
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 7.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 48,500,000     $ 48,500,000    
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 70,000,000.0     70,000,000.0    
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 80,800,000     80,800,000    
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 91,500,000     91,500,000    
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Member] | kaleo            
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 59,300,000     59,300,000    
Unrealized gain (loss) on investment under fair value method       (24,800,000) $ 6,600,000  
Gain (Loss) on Disposition of Assets       $ 0 (11,000)  
kaleo            
Total cash invested in private company           $ 7,500,000
Ownership interest percentage       18.00%    
Carrying value 70,700,000 $ 95,500,000   $ 70,700,000    
Other Interest and Dividend Income     $ 17,600,000   17,600,000  
Unrealized gain (loss) on investment under fair value method (1,300,000)   $ (7,100,000) 24,800,000 24,182,000  
Unrealized Gain Loss On Investments Net Of Tax $ (900,000)     $ 19,500,000 $ 19,900,000  
Basis point decrease of weighted average cost of capital assumption        
Basis point increase of weighted average cost of capital assumption        
DCF Method for Fair Value Estimate [Member] | kaleo | Measurement Input, Discount Rate [Member]            
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 20.00% 10.00% 15.00%      
DCF Method for Fair Value Estimate [Member] | 7.0x [Member] | kaleo            
EV-to-Adjusted EBITDA Multiple Method       5.0 x    
DCF Method for Fair Value Estimate [Member] | 9.6x [Member] | kaleo            
EV-to-Adjusted EBITDA Multiple Method       7.0 x    
DCF Method for Fair Value Estimate [Member] | 10.0x [Member] | kaleo            
EV-to-Adjusted EBITDA Multiple Method       8.0x    
DCF Method for Fair Value Estimate [Member] | 11.0x [Member] | kaleo            
EV-to-Adjusted EBITDA Multiple Method       9.0x    
DCF Method for Fair Value Estimate [Member] | 8.0x [Member] | kaleo            
EV-to-Adjusted EBITDA Multiple Method       6.0 x    
EBITDA Multiple Method for Fair Value Estimate [Member] | kaleo            
Weighting of EBITDA Multiple Method versus DCF Method 80.00%     80.00%