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Investments (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2008
Aug. 31, 2007
Unrealized gain (loss) on investment under fair value method     $ 2,900,000 $ 100,000      
Cost-method investment, OTTI 0 0 0        
Gain (Loss) on Disposition of Assets     919,000 0      
kaleo
              
Total cash invested in private company           7,500,000   
Ownership interest percentage     20.00%        
Carrying value 40,000,000   40,000,000   37,100,000    
Unrealized gain (loss) on investment under fair value method 4,000,000 (3,100,000) 2,900,000 100,000      
Weighted average cost of capital   55.00% 45.00%   55.00%    
Basis point decrease of weighted average cost of capital assumption 5.00%   5.00%        
Basis point increase of weighted average cost of capital assumption 5.00%   5.00%        
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption 8,000,000   8,000,000        
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption 6,000,000   6,000,000        
Harbinger Fund
              
Cost-method investment, OTTI 200,000 200,000 800,000 200,000      
Harbinger Fund
              
Cost-method investment, OTTI 200,000            
Total withdrawal proceeds received 0   200,000 200,000      
Cost Method Investments 1,800,000   1,800,000   2,800,000    
Alleghany and Bath County, Virginia [Member]
              
Cost-method investment, OTTI       1,018,000      
Gain (Loss) on Disposition of Assets 0   1,208,000        
Gain (Loss) on Sale of Investment Property, After Tax     800,000        
Unrealized Gain (Loss) on Investment Property       (1,018,000)      
Unrealized Gain Loss On Investment Property After Tax       (600,000)      
Cost Method Investments $ 2,600,000   $ 2,600,000   $ 5,900,000