Supplemental Cash Flow Information (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands	Mar. 31, 2019		Dec. 31, 2018		Mar. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash and Cash Equivalents	$ 60,570	[1]	$ 65,865	[1]	$ 88,238
Restricted Deposits and Mortgage Escrows	11,134		10,272		7,395
Total	$ 71,704		$ 76,137		$ 95,633	$ 21,334

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at March 31, 2019 and December 31, 2018 are Property, net of $201,924 and $198,466; Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net of $8,863 and $12,220; Cash and Cash Equivalents of $8,710 and $8,243; Debt, net of $45,582 and $45,774.