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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2012
Goodwill [Abstract]  
Goodwill Rollforward [Table Text Block]
  December 31,
  2012 2011
Balance at beginning of year$ 211,886$ 211,886
Additions related to acquisitions  50,878  -
     
Balance at end of year$ 262,764$ 211,886