Cash Flow Disclosures & Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Dec. 31, 2016
Cash and Cash Equivalents, at Carrying Value	$ 102,762	$ 48,372	$ 42,499
Interest Costs Capitalized	7,807	15,221	12,400
Interest Paid, Excluding Capitalized Interest, Operating Activities	143,700	125,500	100,900
Income Taxes Paid, Net	900	500	2,500
Restricted Cash and Cash Equivalents	656	94,557	121,905
Other non-cash additions to properties	77,700	99,400	79,000
Effect of Exchange Rate on Cash and Cash Equivalents	(1,215)	(5,314)	2,261
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	103,418	142,929	164,404		$ 152,965
Cash Paid for Operating Leases	14,400
Operating Lease, Right-of-Use Asset	173,796			$ 178,100
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	79,300
Deposit Assets, Foreign [Member]
Restricted Cash and Cash Equivalents		92,500	119,200
Restricted Cash Stipulated by Lenders and Various Agreements [Member]
Restricted Cash and Cash Equivalents	$ 700	$ 94,600	$ 121,900
Preferred Stock [Member]
Stock Issued During Period, Shares, Acquisitions	1,500,000
Preferred Stock [Member] | The Gardens Mall [Member]
Stock Issued During Period, Shares, Acquisitions	1,500,000