Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v2.4.1.9
Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Rents and other receivables, allowance for doubtful accounts $ 2,912us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables $ 3,392us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, Shares Authorized (in shares) 10,000us-gaap_PreferredStockSharesAuthorized 10,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Shares Issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, Shares Outstanding (in shares) 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Shares of beneficial interest, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Shares of beneficial interest, shares authorized (in shares) 100,000us-gaap_CommonStockSharesAuthorized 100,000us-gaap_CommonStockSharesAuthorized
Shares of beneficial interest, shares issued (in shares) 68,126us-gaap_CommonStockSharesIssued 67,819us-gaap_CommonStockSharesIssued
Shares of beneficial interest, shares outstanding (in shares) 68,126us-gaap_CommonStockSharesOutstanding 67,819us-gaap_CommonStockSharesOutstanding