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Investments (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 02, 2007
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2008
Investments, Other Investments [Line Items]            
Gain (loss) on investment accounted for under the fair value method     $ (33,800) $ (1,600) $ 20,500  
kaleo            
Investments, Other Investments [Line Items]            
Total cash invested in private company           $ 7,500
Ownership interest percentage     20.00%      
Gain (loss) on investment accounted for under the fair value method   $ (1,600) $ (33,800) [1] $ (1,600) [1] 20,500 [1]  
Unrealized gain (loss) on investments, net of tax   $ 1,200 $ 24,000   (15,700)  
Weighted average cost of capital   45.00% 45.00% 45.00%    
Basis point decrease of weighted average cost of capital assumption     5.00%      
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption     $ 11,000      
Basis point increase of weighted average cost of capital assumption     5.00%      
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption     $ 10,000      
Harbinger            
Investments, Other Investments [Line Items]            
Total cash invested in private company $ 10,000          
Withdrawal proceeds     0   100  
Maximum | Harbinger            
Investments, Other Investments [Line Items]            
Percent ownership in investment (less than) 1.00%          
Other Assets and Deferred Charges [Member] | kaleo            
Investments, Other Investments [Line Items]            
Carrying value   $ 20,200 54,000 $ 20,200    
Other Assets and Deferred Charges [Member] | Harbinger            
Investments, Other Investments [Line Items]            
Carrying value of investment   1,700 1,700 1,700    
Other Assets and Deferred Charges [Member] | Alleghany and Bath County, Virginia            
Investments, Other Investments [Line Items]            
Carrying value of investment   1,600 1,600 1,600    
Alleghany and Bath County, Virginia            
Investments, Other Investments [Line Items]            
Gain (loss) on investment accounted for under the fair value method   (1,000) 0 1,032 0  
Unrealized Gain (Loss) on Investment Property     $ 0 (1,032) $ 0  
Unrealized Gain Loss On Investment Property After Tax   $ (700)   $ 700    
[1] See Notes 1, 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.