Noncontrolling interests (Tables)

3 Months Ended

Mar. 31, 2014

Redeemable Noncontrolling Interest Equity Carrying Amount [Abstract]

Redeemable Noncontrolling Interest [Table Text Block]

	For the three		For the three
	months ended		months ended
	March 31, 2014		March 31, 2013
Balance at beginning of period	$	56,627	$	0
Net income attributable to noncontrolling interests		3,044		0
Sale of shares to noncontrolling interests		0		36,844
Balance at end of period	$	59,671	$	36,844