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Stockholders' Equity (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 6 Months Ended
Jul. 11, 2011
Apr. 19, 2011
Jun. 30, 2011
Jun. 30, 2010
Stockholders' Equity        
Dividends declared per share $ 0.13      
Dividends paid date Aug. 22, 2011
Dividends payable record date Jul. 25, 2011
Dividends declared date Jul. 11, 2011
Options granted   400    
Stock options strike price   $ 35.00    
Closing stock price on date of grant   $ 31.78    
Options vesting and exercisable, maximum (in years)     8  
Options termination period after the end of the relevant vesting period (in months)     13  
Total stock-based compensation expense for the Fastenal option plan     $ 1,800 $ 2,000
Unrecognized compensation expense     $ 17,384  
Weighted average period over which total unrecognized compensation expense will be recognized (in years)     5.03