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Credit Facility (Details Textual) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Aug. 31, 2012
Credit Facility (Textual) [Abstract]    
Maximum borrowing   $ 100
Scheduled expiration date of credit facility Aug. 31, 2015  
Fee for unused amount 0.50%  
Line of Credit [Member]
   
Credit Facility (Textual) [Abstract]    
Line of credit facility outstanding 25.1  
Line of credit facility Interest rate 4.25%  
Letter of Credit [Member]
   
Credit Facility (Textual) [Abstract]    
Letter of credit outstanding 6.8  
Letter of credit sub-limit   $ 15