Supplemental Cash Flow Information (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands	Jun. 30, 2018		Dec. 31, 2017		Jun. 30, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Cash and Cash Equivalents	$ 13,096	[1]	$ 13,219	[1]	$ 6,657
Restricted Deposits and Mortgage Escrows	20,603		8,115		5,965
Total	$ 33,699		$ 21,334		$ 12,622	$ 41,279

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at June 30, 2018 and December 31, 2017 are Property, net of $203,421 and $207,969; Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net of $10,184 and $12,011; Cash and Cash Equivalents of $7,636 and $9,025; Debt, net of $46,152 and $46,253.