COMMITMENTS AND CONTINGENCIES (Details) - USD ($)		12 Months Ended			63 Months Ended
	Jun. 27, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Commitments
Letters of Credit Outstanding, Amount		$ 13,800,000	$ 6,500,000		$ 13,800,000
Amount of outstanding surety bonds		88,500,000	112,400,000		88,500,000
South Street Seaport Ground Lease
Commitments
Annual fixed rent	$ 1,200,000
Annual rent escalation rate (as a percent)	3.00%
Additional annual rent payments to be made through the term of the lease	$ 210,000
Damage Due to Flooding
Commitments
Insurance recoveries collected					$ 54,800,000
Gain on insurance recoveries, recognized in other income		$ 700,000	$ 6,200,000	$ 300,000