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Mortgage Notes Payable - Future Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total Debt $ 2,008,417 $ 2,191,481
Secured Debt [Member]    
Debt Instrument [Line Items]    
2018 202,131  
2019 560,389  
2020 694,921  
2021 44,846  
2022 42,466  
Thereafter 435,808  
Total Debt $ 1,980,561