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Mortgage Notes Payable Mortgage Notes Payable - Future Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total Debt $ 2,191,481 $ 2,215,077
Secured Debt [Member]    
Debt Instrument [Line Items]    
2017 82,796  
2018 301,575  
2019 576,954  
2020 693,868  
2021 51,584  
Thereafter 441,313  
Total Debt $ 2,148,090