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Stock-Based Employee Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Installment
Mar. 31, 2012
Stock-Based Employee Compensation (Additional Textual) [Abstract]    
Non stock-based compensation $ 0.2 $ 0.2
Fair market value of restricted shares granted $ 2.34  
Number of installments of restricted shares 3  
Unrecognized compensation expense of restricted stock $ 2.0 $ 1.5
2005 executive incentive compensation plan [Member] | Restricted stock [Member]
   
Stock-Based Employee Compensation (Textual) [Abstract]    
Restricted stock shares granted 563,930