Supplemental Cash Flow Information (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Dec. 31, 2018		Sep. 30, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash and Cash Equivalents	$ 124,406	[1]	$ 65,865	[1]	$ 24,412
Restricted Deposits and Escrows	62,274		10,272		22,369
Total	$ 186,680		$ 76,137		$ 46,781	$ 21,334

[1] Consolidated variable interest entities' assets and debt included in the above balances (see Note 15) at September 30, 2019 and December 31, 2018 are Property, net of $197,312 and $198,466; Accrued Rent, Accrued Contract Receivables and Accounts Receivable, net of $9,825 and $12,220; Cash and Cash Equivalents of $10,388 and $8,243; Debt, net of $45,191 and $45,774.