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Stockholders' Equity (Narrative) (Details) (USD $)
9 Months Ended9 Months Ended1 Months Ended1 Months Ended9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Restricted Stock [Member]
Feb. 28, 2011
Restricted Stock [Member]
Equity Compensation Plan [Member]
Apr. 30, 2011
Restricted Stock [Member]
Non Employee [Member]
Apr. 30, 2011
Stock Options [Member]
Apr. 30, 2011
Equity Compensation Plan [Member]
Feb. 28, 2009
Chief Executive Officer [Member]
Sep. 30, 2011
Chief Executive Officer [Member]
Stockholders' Equity [Line Items]         
Common stock, shares authorized20,000,00020,000,000       
Common stock, par value per share$ 0.01$ 0.01       
Common stock, shares issued12,006,07513,316,822       
Common stock, shares outstanding12,006,07513,316,822       
Preferred stock, shares authorized8,000,0008,000,000       
Preferred stock, shares issued00       
Preferred stock, shares outstanding00       
Annual cash dividends$ 4.00$ 3.00       
Quarterly cash dividends1.000.75       
Shares approved by the Company's stockholders for grants     350,000300,000  
Closing price of company's stock on date of stock grant   132.23118.80    
Vesting period, years   threethree ten  
Number of shares granted  74,86867,7987,070  183,680 
Unrecognized stock-based compensation for unvested restricted stock$ 47,100,000        
Stock-based compensation vest dateFebruary 10, 2019        
Stock-based compensation cost recognized period, months65       26