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Stockholder's Equity (Tables)
6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
  
Balance, December 31, 201163,777
Granted 57,016
Vested (57,577)
Cancelled (411)
Balance, December 31, 201262,805
Granted 76,283
Vested (715)
Cancelled (784)
Balance, June 30, 2013137,589