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Consolidated Statements of Beneficiaries' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Distributions Declared, Per Share $ 0.60us-gaap_CommonStockDividendsPerShareDeclared $ 0.60us-gaap_CommonStockDividendsPerShareDeclared
Cumulative Distributions    
Distributions Declared, Per Share $ 0.60us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember		 $ 0.60us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember
Non-Controlling Interests    
Distributions Declared, Per Share $ 0.60us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 0.60us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember