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Employee Benefit Plans (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Compensation Plan      
Liabilities, including the Company's common stock $ 23,893,000 $ 20,187,000  
Savings Investment Plan
      
Defined Contribution plans      
Plan contributions charged to expense 2,500,000 2,000,000 2,200,000
Contribution match on portion of employee salary (as a percent) 6.00%    
Discretionary profit sharing contribution Plan      
Plan contributions charged to expense 3,900,000 3,600,000 800,000
Discretionary profit sharing contribution match on portion of employee salary and bonus (as a percent) 9.00%    
Deferred compensation plan
      
Deferred Compensation Plan      
Market value of the trust assets, excluding the Company's common stock 10,600,000 10,800,000  
Liabilities, including the Company's common stock 23,900,000 20,200,000  
Company's common stock held in the rabbi trust 5,700,000 4,900,000  
Number of common stock deferred into the rabbi trust (in shares) 267,087    
General and Administrative expense recognized due to increase in the closing price of the Company's shares held in the trust and also due to the sale of shares in the Company's stock 3,200,000    
Plan contributions charged to expense $ 661,676 $ 522,807 $ 109,196