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Supplemental Detail for Certain Components of Consolidated Balance Sheets (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Distributions payable    
Declared distributions $ 43,675us-gaap_DividendsPayableCurrentAndNoncurrent $ 41,452us-gaap_DividendsPayableCurrentAndNoncurrent
Noncontrolling interests    
Distributions payable    
Declared distributions 150us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 161us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Common stock    
Distributions payable    
Declared distributions 41,268us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 37,797us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Preferred stock    
Distributions payable    
Declared distributions $ 2,257us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember		 $ 3,494us-gaap_DividendsPayableCurrentAndNoncurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember