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Investments (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2008
Investments, Other Investments [Line Items]        
Goodwill, Impairment Loss $ 13,696 $ 0 $ 0  
Gain (loss) on investment accounted for under the fair value method $ 60,900 (10,900) (30,600)  
Other Interest and Dividend Income   17,600    
Other Interest and Dividend Income   17,600    
kaleo        
Investments, Other Investments [Line Items]        
Ownership interest percentage 20.00%      
Gain (loss) on investment accounted for under the fair value method [1] $ 60,900 (28,482) (30,600)  
Unrealized gain (loss) on investments, net of tax (47,600) 23,400    
Total cash invested in private company       $ 7,500
Other Interest and Dividend Income   17,600    
Gain (Loss) on Investments   28,500    
Total cash invested in private company       $ 7,500
Other Interest and Dividend Income   17,600    
Gain (Loss) on Investments   28,500    
Other Assets and Deferred Charges [Member] | kaleo        
Investments, Other Investments [Line Items]        
Carrying value 34,600 95,500    
Alleghany and Bath County, Virginia        
Investments, Other Investments [Line Items]        
Unrealized Gain (Loss) on Investment Property $ 0 $ 0 $ 186  
DCF Method for Fair Value Estimate [Member] | kaleo        
Investments, Other Investments [Line Items]        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 20.00% 10.00%    
[1] See Notes 1, 2, 3, 4 and 17 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.