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Supplemental Detail for Certain Components of Consolidated Balance Sheets (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Distributions payable    
Declared distributions $ 45,466us-gaap_DividendsPayableCurrentAndNoncurrent $ 43,675us-gaap_DividendsPayableCurrentAndNoncurrent
Noncontrolling interests    
Distributions payable    
Declared distributions 140us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 150us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common stock    
Distributions payable    
Declared distributions 43,069us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 41,268us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Preferred stock    
Distributions payable    
Declared distributions $ 2,257us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember		 $ 2,257us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember