Cash Flow Disclosures and Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Interest Costs Capitalized		$ 3,218	$ 4,354
Interest Paid, Excluding Capitalized Interest, Operating Activities		66,600	72,200
Income Taxes Paid, Net		800	800
Cash Paid for Operating Leases		7,200	7,200
Capital Expenditures Incurred but Not yet Paid		65,300	89,800
Operating Lease, Right-of-Use Asset		172,877		$ 173,796	$ 178,100
Cash and cash equivalents		240,808		102,762
Restricted Cash and Cash Equivalents		655		656
Total Cash, Cash Equivalents, and Restricted Cash shown on our Consolidated Statement of Cash Flows	$ 73,711	241,463	73,711	103,418		$ 142,929
The Gardens Mall [Member]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 79,300		$ 79,300
Restricted Cash Stipulated by Lenders and Various Agreements [Member]
Restricted Cash and Cash Equivalents		700		$ 700
Deposit Assets, Foreign [Member]
Restricted Cash and Cash Equivalents
Preferred Stock [Member]
Stock Issued During Period, Shares, Acquisitions	1,500,000		1,500,000
Preferred Stock [Member] | The Gardens Mall [Member]
Stock Issued During Period, Shares, Acquisitions			1,500,000