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Stock-based Compensation (Details 1) (Stock Options [Member], USD $)
12 Months Ended
Dec. 31, 2012
Stock Options [Member]
 
Balance, beginning (in shares) 33,691
Exercised, (in shares) 33,691
Balance, ending (in shares) 0
Outstanding, weighted average exercise price (in dollars per share) $ 16.17
Exercised, weighted average exercise price (in dollars per share) $ 16.17
Outstanding, weighted average exercise price (in dollars per share) $ 0