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Notes Payable (Details Textual) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Installment
Dec. 03, 2012
Dec. 31, 2011
Installment
Jun. 30, 2011
Feb. 28, 2011
Mar. 18, 2009
Jul. 31, 2011
Notes Payable, Other Payables [Member]
Jun. 30, 2011
Notes Payable, Other Payables [Member]
Dec. 31, 2012
Notes Payable, Other Payables [Member]
Dec. 31, 2010
Notes Payable, Other Payables [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2010
Maximum [Member]
Jul. 14, 2011
Maximum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2010
Minimum [Member]
Jul. 14, 2011
Minimum [Member]
Dec. 31, 2012
Revolving credit agreement average effective interest rate of 2.7% inclusive of unused fee [Member]
Jun. 04, 2008
Revolving credit agreement average effective interest rate of 2.7% inclusive of unused fee [Member]
Aug. 27, 2007
Revolving credit agreement average effective interest rate of 2.7% inclusive of unused fee [Member]
Dec. 31, 2012
Promissory note payable in annual installments of $100 plus accrued interest through December 31, 2012, interest accrues at 3.25% per annum [Member]
Dec. 31, 2012
Promissory note payable in annual installments of $50 plus accrued interest through December 21, 2012, interest accrues at 4.00% per annum [Member]
Dec. 31, 2012
Promissory note payable in annual installments of $184 plus accrued interest through June 30, 2013, interest accrues at 3.25% per annum [Member]
Dec. 31, 2012
Promissory note payable in annual installments of $100 plus accrued interest through July 25, 2013, interest accrues at 3.25% per annum [Member]
Dec. 31, 2012
Promissory note payable in annual installments of $50 plus accrued interest through January 3, 2014, interest accrues at 3.25% per annum [Member]
Dec. 31, 2012
Promissory notes payable in aggregate annual installments of $125 plus accrued interest through May 22, 2014, interest accrues at 3.25% per annum [Member]
Notes Payable and Revolving Credit Agreement (Textual) [Abstract]                                                  
Aggregate amount of Notes Payable             $ 200,000 $ 367,272 $ 350,000 $ 500,000                              
Aggregate principal installments             100,000 183,636 175,000                                
Notes Payable (Textual) [Abstract]                                                  
Average effective interest rate                       4.00%     3.25%   2.70%                
Annual installments                                       100,000 50,000 184,000 100,000 50,000 125,000
Percentage of Interest accrues       3.25%     3.25% 3.25% 3.25%                     3.25% 4.00% 3.25% 3.25% 3.25% 3.25%
Revolving credit facility commitment                         75,000,000     50,000,000   50,000,000 30,000,000            
Spread on Libor variable rate                     2.50%     1.60%                      
Spread on base variable rate                     1.00%     0.10%                      
Percentage of unused commitment fee                     0.25%     0.10%                      
Revolving credit outstanding                                 17,400,000                
Remaining revolving credit outstanding                                 57,600,000                
Notes Payable (Additional Textual) [Abstract]                                                  
Purchase of common stock under credit agreement           15,000,000                                      
Company's consolidated leverage ratio less than 1.0 to 1.0                                                
Retirement period of stock repurchased 7 days                                                
Maturity start date Aug. 31, 2011                                                
Maturity end date Aug. 31, 2015                                                
Special Dividend   $ 0.40                                              
Number of annual installments 2   2                                            
Notes payable in equal annual installments of principal over 2 years                                                
Remaining balance on notes payable $ 175,000   $ 284,000   $ 100,000