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Stockholders' Equity (Narrative) (Details) (USD $)
 3 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2012
M
Dec. 31, 2011
Dec. 31, 2010
Apr. 30, 2011
1996 Equity Compensation Plan [Member]
Apr. 30, 2011
2011 Equity Compensation Plan [Member]
Apr. 30, 2012
Restricted Stock [Member]
Feb. 29, 2012
Restricted Stock [Member]
Feb. 29, 2012
Minimum [Member]
Restricted Stock [Member]
Feb. 29, 2012
Maximum [Member]
Restricted Stock [Member]
Stockholders' Equity [Line Items]                  
Common stock, shares authorized 20,000,000 20,000,000              
Common stock, par value $ 0.01 $ 0.01              
Common stock, shares issued 11,863,940 11,792,456              
Common stock, shares outstanding 11,863,940 11,792,456              
Preferred stock, shares authorized 8,000,000 8,000,000              
Preferred stock, shares issued 0 0              
Preferred stock, shares outstanding 0 0              
Annual cash dividends $ 4.00   $ 3.00            
Quarterly cash dividends 1.00   0.75            
Shares approved for grants           10,700 72,013    
Shares available for grant       350,000 300,000        
Vesting period, years         ten three   five seven
Closing price of stock on date of stock grant           $ 83.88 $ 115.55    
Stock-based compensation cost which has not yet been recognized $ 47,600,000                
Stock-based compensation cost recognized period, in months 63