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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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