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Investments (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 02, 2007
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
Investments, Other Investments [Line Items]          
Gain (loss) on investment accounted for under the fair value method   $ (20,500) $ 2,000 $ 3,400  
kaleo          
Investments, Other Investments [Line Items]          
Total cash invested in private company         $ 7,500
Ownership interest percentage   19.00%      
Gain (loss) on investment accounted for under the fair value method [1]   $ (20,500) 2,000 3,400  
Unrealized gain (loss) on investments, net of tax   $ (15,700) $ 1,000 $ 2,200  
Fair Value Inputs, Discount Rate     45.00% 55.00%  
Weighted average cost of capital   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   $ 4,000      
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   $ 4,000      
Harbinger          
Investments, Other Investments [Line Items]          
Total cash invested in private company $ 10,000        
Unrealized loss on investments under fair value method, other than temporary impairment     $ 800 $ 400  
Unrealized loss on investments, net of tax     400 300  
Withdrawal proceeds   100 200 400  
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   18,600 39,100    
Other Assets and Deferred Charges [Member] | Harbinger          
Investments, Other Investments [Line Items]          
Carrying value of investment   1,700 1,800    
Other Assets and Deferred Charges [Member] | Alleghany and Bath County, Virginia          
Investments, Other Investments [Line Items]          
Carrying value of investment   2,600 2,600    
Alleghany and Bath County, Virginia          
Investments, Other Investments [Line Items]          
Gain (Loss) on Disposition of Assets   0 1,208 0  
Unrealized Gain (Loss) on Investment Property   $ 0 0 (1,018)  
Unrealized Gain Loss On Investment Property After Tax       $ (600)  
Gain (Loss) on Sale of Investment Property, After Tax     $ 800    
[1] See Notes 1, 3, 4 and 18 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.