Supplemental Cash Flow Information (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands	Jun. 30, 2019		Dec. 31, 2018		Jun. 30, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash and Cash Equivalents	$ 118,222	[1]	$ 65,865	[1]	$ 13,096
Restricted Deposits and Mortgage Escrows	14,854		10,272		20,603
Total	$ 133,076		$ 76,137		$ 33,699	$ 21,334

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at June 30, 2019 and December 31, 2018 are Property, net of $198,884 and $198,466; Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net of $9,217 and $12,220; Cash and Cash Equivalents of $9,193 and $8,243; Debt, net of $45,388 and $45,774.