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Stockholders' Equity (Narrative) (Details) (USD $)
 6 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Restricted Stock [Member]
Feb. 28, 2011
Restricted Stock [Member]
Equity Compensation Plan [Member]
Apr. 30, 2011
Restricted Stock [Member]
Non Employee [Member]
Apr. 30, 2011
Stock Options [Member]
Apr. 30, 2011
Equity Compensation Plan [Member]
Feb. 28, 2009
Chief Executive Officer [Member]
Jun. 30, 2011
Chief Executive Officer [Member]
Common stock, shares authorized 20,000,000 20,000,000              
Common stock, par value per share $ 0.01 $ 0.01              
Common stock, shares issued 12,008,763 13,316,822              
Common stock, shares outstanding 12,008,763 13,316,822              
Preferred stock, shares authorized   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 by the Company's stockholders for grants           350,000 300,000    
Closing price of company's stock on date of stock grant       132.23 118.80        
Vesting period, years       three three   ten    
Number of shares granted     74,868 67,798 7,070     183,680  
Unrecognized stock-based compensation for unvested restricted stock $ 50,600,000                
Stock-based compensation vest date February 10, 2019                
Stock-based compensation cost recognized period, months 66               29