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Line of Credit (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Line of Credit (Textual) [Abstract]  
Revolving line of credit agreement, expiration date Jul. 30, 2015
Credit agreement borrowings maximum $ 35
Outstanding borrowings 20.9
Interest rate on borrowings 3.64%
Amount reserved for outstanding letters of credit $ 4.5