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Debt Mortgage Loans Maturity Schedule (Details) - Secured Debt
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
extension
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Debt instrument, number of extensions | extension 3  
Debt instrument, extended term 1 year  
Maturities of Long-term Debt [Abstract]    
2017 $ 3,702,205  
2018 531,373  
Long-term Debt $ 4,233,578 $ 5,263,994