Supplemental Cash Flow Information (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Cash and Cash Equivalents	$ 88,238	[1]	$ 13,219	[1]	$ 3,615
Restricted Deposits and Mortgage Escrows	7,395		8,115		3,299
Total	$ 95,633		$ 21,334		$ 6,914	$ 41,279

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at March 31, 2018 and December 31, 2017 are Property, net of $205,484 and $207,969; Accrued Rent and Accounts Receivable, net of $10,324 and $12,011; Cash and Cash Equivalents of $8,754 and $9,025; Debt, net of $46,030 and $46,253.