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Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income / (loss) (numerator):
Loss from continuing operations									$ (33,092)us-gaap_IncomeLossFromContinuingOperations	$ (20,074)us-gaap_IncomeLossFromContinuingOperations	$ (10,236)us-gaap_IncomeLossFromContinuingOperations
Income from discontinued operations										1,008us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Noncontrolling interest									14,965us-gaap_IncomeLossAttributableToNoncontrollingInterest	13,245us-gaap_IncomeLossAttributableToNoncontrollingInterest
Dividends on preferred shares									18,928us-gaap_PreferredStockDividendsIncomeStatementImpact	1,160us-gaap_PreferredStockDividendsIncomeStatementImpact
Conversion of preferred units										10,456us-gaap_ConvertiblePreferredStockConvertedToOtherSecurities
Net loss attributable to common shareholders	$ (19,312)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (21,747)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (12,250)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (13,676)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (14,519)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (7,659)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (13,997)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (7,752)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (66,985)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (43,927)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (10,236)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average shares (denominator)
Weighted average shares outstanding - basic and diluted (in shares)									196,348,757us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	123,592,086us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	7,225,512us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share-basic and diluted:
Loss from continuing operations (in dollars per share)									$ (0.34)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.37)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (1.42)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Income from discontinued operations (in dollars per share)										$ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare
Net loss per share-basic and diluted	$ (0.09)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.11)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.07)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.07)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.08)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.05)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.15)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.16)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.34)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.36)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.42)us-gaap_EarningsPerShareBasicAndDiluted

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

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