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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Storage facilities, net	$ 2,625,129us-gaap_RealEstateInvestmentPropertyNet	$ 2,155,170us-gaap_RealEstateInvestmentPropertyNet
Series A Preferred shares, percentage	7.75%us-gaap_PreferredStockDividendRatePercentage	7.75%us-gaap_PreferredStockDividendRatePercentage
Series A Preferred shares, par value (in dollars per share)	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Series A Preferred shares, shares authorized	3,220,000us-gaap_PreferredStockSharesAuthorized	3,220,000us-gaap_PreferredStockSharesAuthorized
Series A Preferred shares, shares issued	3,100,000us-gaap_PreferredStockSharesIssued	3,100,000us-gaap_PreferredStockSharesIssued
Series A Preferred shares, shares outstanding	3,100,000us-gaap_PreferredStockSharesOutstanding	3,100,000us-gaap_PreferredStockSharesOutstanding
Common shares, par value (in dollars per share)	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common shares, shares authorized	200,000,000us-gaap_CommonStockSharesAuthorized	200,000,000us-gaap_CommonStockSharesAuthorized
Common shares, shares issued	163,956,675us-gaap_CommonStockSharesIssued	139,328,366us-gaap_CommonStockSharesIssued
Common shares, shares outstanding	163,956,675us-gaap_CommonStockSharesOutstanding	139,328,366us-gaap_CommonStockSharesOutstanding
VIE
Storage facilities, net	$ 49,829us-gaap_RealEstateInvestmentPropertyNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember	$ 34,559us-gaap_RealEstateInvestmentPropertyNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember

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