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Fair Value of Financial Instruments Schedule of the aggregate carrying value of debt and estimates of fair value (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Carrying Amount [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage notes payable $ 1,005,569 $ 883,112
Loans Payable, Fair Value Disclosure 355,600 325,000
Fair Value [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage notes payable 1,016,992 900,064
Loans Payable, Fair Value Disclosure 355,600 325,000
Senior Notes [Member] | Carrying Amount [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage notes payable 236,999 0
Senior Notes [Member] | Fair Value [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortgage notes payable $ 253,469 $ 0