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Mortgages, construction loan payable and credit line (Schedule of Principal Amounts Due) (Details)
$ in Thousands
Oct. 31, 2016
USD ($)
Debt Disclosure [Abstract]  
2017 $ 139,687 [1]
2018 9,751
2019 49,495
2020 3,750
2021 $ 22,472
[1] Includes approximately $114 million relating to the Rotunda construction loan due October 2017.