Development Project Costs, Cash Collateral for Deposit Bond and Cash for Development Projects (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Feb. 29, 2016
Development Costs [Line Items]
Capitalized project development costs	$ 339,700		$ 339,700		$ 202,400
Interest Expense			9,900
Project Development Costs Incurred			145,900	$ 100,700
Capitalized Project Development Costs, Period Increase			137,300	94,500
Development Projects costs	4,416	$ 3,157	8,685	6,223
Deposit Assets	$ 20,000		$ 20,000			$ 15,000
Deposit Asset, Percent of Minimum Capital Investment Expended for Deposit Return	85.00%		85.00%
Restricted Cash and Cash Equivalents, Noncurrent	$ 327,477		$ 327,477		26,384
Land Lease Expense [Member]
Development Costs [Line Items]
Project Development Costs Incurred			5,300	5,200
Salary and Related Benefits [Member]
Development Costs [Line Items]
Project Development Costs Incurred			1,327
Bank Charges [Member]
Development Costs [Line Items]
Project Development Costs Incurred			866
Pre-opening Expense [Member]
Development Costs [Line Items]
Project Development Costs Incurred			298	373
Professional Services [Member]
Development Costs [Line Items]
Project Development Costs Incurred			137	208
Property Tax Expense [Member]
Development Costs [Line Items]
Project Development Costs Incurred			321	273
Insurance Expense [Member]
Development Costs [Line Items]
Project Development Costs Incurred			286	$ 197
Selling and Marketing Expense [Member]
Development Costs [Line Items]
Project Development Costs Incurred			176
Transferable Subscription Rights [Member]
Development Costs [Line Items]
Restricted Cash and Cash Equivalents, Noncurrent	$ 327,500		$ 327,500		$ 26,400