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Share-Based Payments (Options and Stock Appreciation Rights Outstanding) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Available For Grant, Beginning Balance     291,000  
Shares Available For Grant, Exercised     0  
Shares Available For Grant, Forfeited     0  
Shares Available For Grant, Expired     0  
Shares Available For Grant, Granted     0  
Shares Available For Grant, Ending Balance 291,000   291,000  
Shares/Awards [Roll Forward]        
Options Outstanding, Shares, Beginning Balance     36,668  
Options Outstanding, Shares, Exercised     (5,000)  
Options Outstanding, Shares, Forfeited     (500)  
Options Outstanding, Shares, Expired     0  
Options Outstanding, Shares, Granted     0  
Options Outstanding, Shares, Ending Balance 31,168   31,168  
Weighted-Average Exercise Price [Roll Forward]        
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance     $ 229.24  
Options Outstanding, Weighted-Average Exercise Price, Exercised     $ 150.00  
Options Outstanding, Weighted-Average Exercise Price, Forfeited     $ 255.13  
Options Outstanding, Weighted-Average Exercise Price, Expired     $ 0.00  
Options Outstanding, Weighted-Average Exercise Price, Granted     $ 0.00  
Options Outstanding, Weighted-Average Exercise Price, Ending Balance $ 241.54   $ 241.54  
Compensation cost, liability balance $ 7,700,000 $ 5,900,000 $ 7,700,000 $ 5,900,000
Total intrinsic value of options exercised     800,000 2,100,000
Total share-based liabilities paid     600,000 2,100,000
Cash received from exercise of options     700,000 400,000
Total fair value of shares vested $ 200,000 $ 0    
Stock Appreciation Rights [Member]
       
Shares/Awards [Roll Forward]        
Options Outstanding, Shares, Beginning Balance     99,461  
Options Outstanding, Shares, Exercised     (1,825)  
Options Outstanding, Shares, Forfeited     (3,350)  
Options Outstanding, Shares, Granted     0  
Options Outstanding, Shares, Ending Balance 94,286.000   94,286.000  
Weighted-Average Exercise Price [Roll Forward]        
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance     $ 156.93  
Options Outstanding, Weighted-Average Exercise Price, Exercised     $ 114.64  
Options Outstanding, Weighted-Average Exercise Price, Forfeited     $ 165.46  
Options Outstanding, Weighted-Average Exercise Price, Granted     $ 0.00  
Options Outstanding, Weighted-Average Exercise Price, Ending Balance $ 157.45   $ 157.45