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Noncontrolling interests (Tables)
12 Months Ended
Dec. 31, 2013
Redeemable Noncontrolling Interest Equity Carrying Amount [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
  2013 
Balance at January 1  $0  
Net income attributable to noncontrolling interests  9,434  
Sale of shares to noncontrolling interests  47,193  
Balance at December 31 $56,627