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Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets    
Accumulated depreciation $ 185,994us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation $ 151,078us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Stockholders’ equity    
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 5,750,000us-gaap_PreferredStockSharesIssued 5,750,000us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 5,750,000us-gaap_PreferredStockSharesOutstanding 5,750,000us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 125,000,000us-gaap_CommonStockSharesAuthorized 125,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 59,047,001us-gaap_CommonStockSharesIssued 38,788,745us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 59,047,001us-gaap_CommonStockSharesOutstanding 38,788,745us-gaap_CommonStockSharesOutstanding