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Noncontrolling interests (Tables)
6 Months Ended
Jun. 30, 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 1,183  
Sale of shares to noncontrolling interests 47,136  
Balance at June 30 48,319