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Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income / (loss) (numerator):
Loss from continuing operations									$ (47,948)	$ (33,092)	$ (20,074)
Income from discontinued operations									0	0	1,008
Noncontrolling interest									14,353	14,965	13,245
Dividends on preferred shares									22,276	18,928	1,160
Conversion of preferred units									0	0	10,456
Net loss attributable to common shareholders	$ (20,474)	$ (28,616)	$ (17,697)	$ (17,790)	$ (19,312)	$ (21,747)	$ (12,250)	$ (13,676)	$ (84,577)	$ (66,985)	$ (43,927)
Weighted-average shares (denominator)
Weighted-average shares outstanding-basic and diluted (in shares)									210,600,111	196,348,757	123,592,086
Net loss per share—basic and diluted:
Loss from continuing operations (in dollars per share)									$ (0.40)	$ (0.34)	$ (0.37)
Income from discontinued operations (in dollars per share)									0.00	0.00	0.01
Net loss attributable to common shareholders per share - basic and diluted (in dollars per share)	$ (0.10)	$ (0.14)	$ (0.08)	$ (0.08)	$ (0.09)	$ (0.11)	$ (0.07)	$ (0.07)	$ (0.40)	$ (0.34)	$ (0.36)

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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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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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