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Mortgage Notes Payable Mortgage Notes Payable - Future Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 2,215,077 $ 2,234,317
Secured Debt [Member]    
Debt Instrument [Line Items]    
2016 29,714  
2017 199,180  
2018 320,622  
2019 586,212  
2020 693,088  
Thereafter 329,451  
Long-term debt $ 2,158,267