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Investments (Narrative) (Details) 1 - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2008
Unrealized gain (loss) on investment under fair value method       $ 10,900,000 $ 11,900,000    
Cost-method investment, OTTI $ 0 $ (186,000)   0      
Gain (Loss) on Disposition of Assets       $ (6,328,000) (86,000)    
kaleo              
Total cash invested in private company             $ 7,500,000
Ownership interest percentage       18.00%      
Carrying value 95,500,000   $ 91,200,000 $ 95,500,000   $ 84,600,000  
Other Interest and Dividend Income       17,582,000      
Unrealized gain (loss) on investment under fair value method 4,300,000 $ (2,100,000)   28,482,000 11,900,000    
Unrealized Gain Loss On Investments Net Of Tax $ 3,400,000     $ 23,400,000      
Basis point decrease of weighted average cost of capital assumption          
Basis point increase of weighted average cost of capital assumption          
Alleghany and Bath County, Virginia [Member]              
Cost-method investment, OTTI         $ (186,000)    
DCF Method for Fair Value Estimate [Member] | kaleo              
EV-to-Adjusted EBITDA Multiple Method       7.0 x      
Weighting of EBITDA Multiple Method versus DCF Method 50.00%     50.00%      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 85,200     $ 85,200      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 15.00%   10.00% 10.00%      
DCF Method for Fair Value Estimate [Member] | 9.6x [Domain] | kaleo              
EV-to-Adjusted EBITDA Multiple Method       9.0 x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 97,600     $ 97,600      
DCF Method for Fair Value Estimate [Member] | 10.0x [Domain] | kaleo              
EV-to-Adjusted EBITDA Multiple Method       10.0x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 103,800     $ 103,800      
DCF Method for Fair Value Estimate [Member] | 11.6x [Domain] | kaleo              
EV-to-Adjusted EBITDA Multiple Method       11.0x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 109,900     $ 109,900      
DCF Method for Fair Value Estimate [Member] | 8.0x [Domain] | kaleo              
EV-to-Adjusted EBITDA Multiple Method       8.0 x      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 91,400     $ 91,400      
EBITDA Multiple Method for Fair Value Estimate [Member] | kaleo              
Weighting of EBITDA Multiple Method versus DCF Method 80.00%     80.00%      
40% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo              
Weighting of EBITDA Multiple Method versus DCF Method 40.00%     40.00%      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 82,100     $ 82,100      
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 96,900     96,900      
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 104,300     104,300      
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 111,700     111,700      
40% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 89,500     $ 89,500      
30% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo              
Weighting of EBITDA Multiple Method versus DCF Method 30.00%     30.00%      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 78,900     $ 78,900      
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 96,200     96,200      
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 104,900     104,900      
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 113,500     113,500      
30% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 87,600     $ 87,600      
20% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo              
Weighting of EBITDA Multiple Method versus DCF Method 20.00%     20.00%      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 75,800     $ 75,800      
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 95,500     95,500      
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 105,400     105,400      
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 115,300     115,300      
20% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 85,600     $ 85,600      
10% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo              
Weighting of EBITDA Multiple Method versus DCF Method 10.00%     10.00%      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 72,600     $ 72,600      
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 94,800     94,800      
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 106,000     106,000      
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 117,100     117,100      
10% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 83,700     $ 83,700      
0% [Domain] | DCF Method for Fair Value Estimate [Member] | kaleo              
Weighting of EBITDA Multiple Method versus DCF Method 0.00%     0.00%      
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 69,500     $ 69,500      
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 9.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 94,200     94,200      
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 10.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 106,500     106,500      
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 11.6x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple 118,900     118,900      
0% [Domain] | DCF Method for Fair Value Estimate [Member] | 8.0x [Domain] | kaleo              
Fair Value Sensitivity Analysis: Weighting to DCF Method at Varied EV-to-Adjusted EBITDA Multiple $ 81,800     $ 81,800