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Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income / (loss) (numerator):
Loss from continuing operations	$ (12,796)	$ (3,861)	$ (23,100)	$ (10,603)
Income from discontinued operations	0	0	0	1,008
Noncontrolling interest	3,382	3,798	11,214	9,357
Dividends on preferred shares	5,569	0	13,359	0
Conversion of preferred units	0	0	0	10,456
Net loss attributable to common shareholders	$ (21,747)	$ (7,659)	$ (47,673)	$ (29,408)
Weighted-average shares (denominator)	202,547,677	162,725,150	191,251,638	102,729,661
Net loss per share- basic and diluted:
Loss from continuing operations (in dollars per share)	$ (0.11)	$ (0.05)	$ (0.25)	$ (0.30)
Income from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Net loss attributable to common shareholders per share-basic and diluted (in dollars per share)	$ (0.11)	$ (0.05)	$ (0.25)	$ (0.29)

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Value of convertible preferred stock that was converted to other securities.

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Amount of Income (Loss) attributable to the noncontrolling interest.

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