Development Projects Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 28, 2017	Jun. 30, 2017	Feb. 29, 2016	Dec. 31, 2014
Development Costs [Line Items]
Deposit Asset, Percent of Minimum Capital Investment Expended for Deposit Return				85.00%
Restricted cash and investments for Development Projects	$ 136,431	$ 26,384
Project development costs incurred	392,200	205,000
Deposit assets					$ 20,000	$ 15,000
Capitalized project development costs, period increase	370,700	192,000
Capitalized project development costs	566,800	202,400
Development Projects	21,558	12,970	$ 32,514
Cash and Cash Equivalents, at Carrying Value	10,380	11,012	$ 6,412				$ 6,435
Marketable Securities, Restricted, Current	94,500
Construction Manager Costs [Member]
Development Costs [Line Items]
Capitalized project development costs	560,200
Architectural, Engineering, Construction Manager, and Subcontractor [Member]
Development Costs [Line Items]
Capitalized project development costs	6,600	198,900
Land Lease Expense [Member]
Development Costs [Line Items]
Project development costs incurred	10,700	10,400
Real Estate Taxes [Member]
Development Costs [Line Items]
Project development costs incurred		400
Salary and Related Benefits [Member]
Development Costs [Line Items]
Project development costs incurred	4,900
Bank Charges [Member]
Development Costs [Line Items]
Project development costs incurred	2,000
Selling and Marketing Expense [Member]
Development Costs [Line Items]
Project development costs incurred	892
Property Tax Expense [Member]
Development Costs [Line Items]
Project development costs incurred	643
Insurance Expense [Member]
Development Costs [Line Items]
Project development costs incurred	571	482
Professional Services [Member]
Development Costs [Line Items]
Project development costs incurred	607	324
Legal Expense [Member]
Development Costs [Line Items]
Project development costs incurred	317
Capitalized project development costs		3,500
Pre-opening Expense [Member]
Development Costs [Line Items]
Project development costs incurred	490	1,200
Legal Fees [Member]
Development Costs [Line Items]
Project development costs incurred		164
Transferable Subscription Rights [Member]
Development Costs [Line Items]
Restricted cash and investments for Development Projects		$ 26,400
Development Projects [Member] | Transferable Subscription Rights [Member]
Development Costs [Line Items]
Restricted cash and investments for Development Projects	136,400
Cash and Cash Equivalents, at Carrying Value	41,900
Marketable Securities, Restricted, Current	$ 94,500