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Investments (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
kaleo
Dec. 31, 2012
kaleo
Dec. 31, 2011
kaleo
Dec. 31, 2008
kaleo
Dec. 31, 2013
Harbinger
Dec. 31, 2012
Harbinger
Dec. 31, 2011
Harbinger
Apr. 02, 2007
Harbinger
Apr. 02, 2007
Maximum
Harbinger
Dec. 31, 2013
Other Assets and Deferred Charges [Member]
kaleo
Dec. 31, 2012
Other Assets and Deferred Charges [Member]
kaleo
Dec. 31, 2013
Other Assets and Deferred Charges [Member]
Harbinger
Dec. 31, 2012
Other Assets and Deferred Charges [Member]
Harbinger
Dec. 31, 2013
Other Assets and Deferred Charges [Member]
Alleghany and Bath County, Virginia
Dec. 31, 2012
Other Assets and Deferred Charges [Member]
Alleghany and Bath County, Virginia
Jun. 30, 2013
Alleghany and Bath County, Virginia
Dec. 31, 2013
Alleghany and Bath County, Virginia
Dec. 31, 2012
Alleghany and Bath County, Virginia
Dec. 31, 2011
Alleghany and Bath County, Virginia
Investments, Other Investments [Line Items]                                            
Total cash invested in private company             $ 7,500,000       $ 10,000,000                      
Ownership interest percentage       20.00%                                    
Gain (loss) on investment accounted for under the fair value method 3,400,000 16,100,000 1,600,000 3,400,000 [1] 16,100,000 [1] 1,600,000 [1]                                
Unrealized gain (loss) on investments, net of tax       2,200,000 10,200,000 1,000,000                                
Percentage of discount on cash flows due to high degree of risk       55.00% 55.00%                                  
Carrying value                         37,100,000 33,700,000                
Weighted average cost of capital       55.00% 55.00%                                  
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       5,000,000                                    
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       5,000,000                                    
Percent ownership in investment (less than)                       2.00%                    
Unrealized loss on investments under fair value method, other than temporary impairment               400,000 1,100,000 600,000                        
Unrealized loss on investments, net of tax               300,000 700,000 400,000                        
Carrying value of investment                             2,800,000 3,600,000 5,900,000 6,900,000        
Withdrawal proceeds               400,000 500,000 600,000                        
Unrealized Gain (Loss) on Investment Property                                       1,018,000 0 0
Gain (Loss) on Sale of Investment Property, After Tax                                     $ 600,000      
[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.