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Noncontrolling interests (Tables)
9 Months Ended
Sep. 30, 2013
Redeemable Noncontrolling Interest Equity Carrying Amount [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
  Total 
  2013 
Balance at January 1  $0  
Net income attributable to noncontrolling interests  5,296  
Sale of shares to noncontrolling interests  47,193  
Balance at September 30 $52,489