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Investments (Narrative) (Details) 1 - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2008
Aug. 31, 2007
Unrealized gain (loss) on investment under fair value method     $ 11,900 $ 24,800        
Cost-method investment, OTTI $ 186 $ 0 186          
Gain (Loss) on Disposition of Assets     $ (86) 412        
kaleo                
Total cash invested in private company             $ 7,500
Ownership interest percentage     20.00%          
Carrying value 65,900   $ 65,900   $ 68,000 $ 54,000    
Unrealized gain (loss) on investment under fair value method (2,100) $ 0 11,900 24,800        
Unrealized Gain Loss On Investment Under Fair Value Method After Taxes $ (1,600)   $ 9,300 18,200        
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       $ 0        
Cost Method Investments $ 1,400   $ 1,400     1,600    
Harbinger Capital Partners Special Situations Fund L P [Member]                
Cost-method investment, OTTI 200   300          
Cost Method Investments $ 1,400   $ 1,400     $ 1,700