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Investments (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 02, 2007
Dec. 31, 2016
Dec. 31, 2016
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     $ 1,600,000 $ (20,500,000) $ 2,000,000    
kaleo              
Investments, Other Investments [Line Items]              
Effect of Excluding Gain on Contract Termination from Expenses and Other, Net     $ 89.6        
Total cash invested in private company             $ 7,500,000
Ownership interest percentage     19.00%        
Gain (loss) on investment accounted for under the fair value method [1]     $ 1,600,000 (20,500,000) 2,000,000    
Unrealized gain (loss) on investments, net of tax     $ 1,200,000 $ (15,700,000) $ 1,000,000    
Fair Value Inputs, Discount Rate         45.00% 55.00%  
Weighted average cost of capital   45.00% 45.00% 45.00%      
Basis point decrease 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   $ 6,000,000 $ 6,000,000        
Basis point increase of weighted average cost of capital assumption   5.00% 5.00%        
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption   $ 5,000,000 $ 5,000,000        
Harbinger              
Investments, Other Investments [Line Items]              
Total cash invested in private company $ 10,000,000            
Unrealized loss on investments under fair value method, other than temporary impairment         $ 800,000    
Unrealized loss on investments, net of tax         400,000    
Withdrawal proceeds     0 $ 100,000 200,000    
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   20,200,000 20,200,000 18,600,000      
Other Assets and Deferred Charges [Member] | Harbinger              
Investments, Other Investments [Line Items]              
Carrying value of investment   1,700,000 1,700,000 1,700,000      
Other Assets and Deferred Charges [Member] | Alleghany and Bath County, Virginia              
Investments, Other Investments [Line Items]              
Carrying value of investment   1,600,000 1,600,000 2,600,000      
Alleghany and Bath County, Virginia              
Investments, Other Investments [Line Items]              
Gain (loss) on investment accounted for under the fair value method   1,000,000 1,032,000        
Gain (Loss) on Disposition of Assets     0 0 1,208,000    
Unrealized Gain (Loss) on Investment Property     (1,032,000) $ 0 0    
Unrealized Gain Loss On Investment Property After Tax   $ (700,000) $ (700,000)        
Gain (Loss) on Sale of Investment Property, After Tax         $ 800,000    
[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.