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Debt (Principal repayments required in the next five years) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Mortgages  
Debt Fiscal Year Maturity  
2017 $ 156,702
2018 1,389,341
2019 399,661
2020 1,882,443
2021 3,173,705
Thereafter 2,372,445
Senior Unsecured Debt And Unsecured Revolving Credit Facilities  
Debt Fiscal Year Maturity  
2017 0
2018 490,630
2019 450,000
2020 0
2021 0
Thereafter $ 400,000