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Investments (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Intelliject [Member]
Dec. 31, 2011
Intelliject [Member]
Dec. 31, 2010
Intelliject [Member]
Dec. 31, 2008
Intelliject [Member]
Aug. 31, 2007
Intelliject [Member]
Dec. 31, 2012
Harbinger [Member]
Dec. 31, 2011
Harbinger [Member]
Apr. 02, 2007
Harbinger [Member]
Apr. 02, 2007
Maximum [Member]
Harbinger [Member]
Total cash invested in private company             $ 7,500,000 $ 7,500,000     $ 10,000,000  
Ownership interest percentage       20.00%                
Unrealized gain (loss) on investments under fair value method 16,100,000 [1] 1,600,000 [1] (2,200,000) [1] 16,100,000 1,600,000 (2,200,000)            
Percent ownership in investment                       2.00%
Unrealized loss on investments under fair value method, other than temporary impairment                 1,100,000 600,000    
Unrealized gain (loss) on investments, net of tax       10,200,000 1,000,000 (1,400,000)            
Unrealized loss on investments, net of tax                 700,000 400,000    
Percentage of discount on cash flows due to high degree of risk       55.00%                
Carrying value       33,700,000 17,600,000              
Weighted average cost of capital       55.00% 60.00%              
Basis point decrease of weighted average cost of capital assumption       500                
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption       6,000,000                
Basis point increase of weighted average cost of capital assumption       500                
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption       5,000,000                
Carrying value of investment                 3,600,000 5,200,000    
Withdrawal proceeds                 $ 500,000 $ 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.