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Investments (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2008
Aug. 31, 2007
Unrealized gain (loss) on investment under fair value method     $ 0 $ (1,100)      
Gain (Loss) on Disposition of Assets     $ 0 837      
kaleo              
Total cash invested in private company           $ 7,500  
Ownership interest percentage     20.00%        
Carrying value $ 39,100   $ 39,100   $ 39,100    
Unrealized gain (loss) on investment under fair value method $ 0 $ (1,100) $ 0 $ (1,100)      
Weighted average cost of capital     45.00% 45.00%      
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 $ 7,000   $ 7,000        
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption 5,000   5,000        
Harbinger Fund              
Cost-method investment, OTTI 0 300 0 $ 600      
Harbinger Fund              
Total withdrawal proceeds received       200      
Cost Method Investments 1,800   1,800   1,800    
Alleghany and Bath County, Virginia [Member]              
Gain (Loss) on Disposition of Assets 0 1,208 0 $ 1,208      
Gain (Loss) on Sale of Investment Property, After Tax   $ 800          
Cost Method Investments $ 2,600   $ 2,600   $ 2,600