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Investments (Narrative) (Details) 1 - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 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% [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 $ 58,200,000      
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 69,000,000.0      
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 74,400,000      
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 79,800,000      
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 $ 63,600,000      
40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo        
Weighting of EBITDA Multiple Method versus DCF Method 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 $ 56,100,000      
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 69,100,000      
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 75,600,000      
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 82,100,000      
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 $ 62,600,000      
30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo        
Weighting of EBITDA Multiple Method versus DCF Method 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 $ 54,100,000      
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 69,300,000      
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 76,900,000      
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 84,400,000      
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 $ 61,700,000      
20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo        
Weighting of EBITDA Multiple Method versus DCF Method 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 $ 52,100,000      
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 69,400,000      
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 78,100,000      
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 86,700,000      
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 $ 60,800,000      
10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo        
Weighting of EBITDA Multiple Method versus DCF Method 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 $ 50,100,000      
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 69,600,000      
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 79,300,000      
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 89,000,000.0      
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 $ 59,800,000      
0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo        
Weighting of EBITDA Multiple Method versus DCF Method 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 $ 48,000,000.0      
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 69,700,000      
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 80,500,000      
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 91,300,000      
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 58,900,000      
Unrealized gain (loss) on investment under fair value method (26,100,000) $ 17,082,000    
Gain (Loss) on Disposition of Assets $ 0 (385,000)    
kaleo        
Total cash invested in private company       $ 7,500,000
Ownership interest percentage 18.40%      
Carrying value $ 69,400,000   $ 95,500,000  
Other Interest and Dividend Income   17,600,000    
Unrealized gain (loss) on investment under fair value method 26,100,000 (17,082,000)    
Unrealized Gain Loss On Investments Net Of Tax $ 20,400,000 $ (14,300,000)    
Basis point decrease of weighted average cost of capital assumption      
Basis point increase of weighted average cost of capital assumption      
Percentage Decrease in Fair Value Investment 27.30%      
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% 15.00% 10.00%  
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%