COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Lessor, Lease, Description [Line Items]
Outstanding letters of credit		$ 15.3	$ 15.3
Amount of outstanding surety bonds		110.1	$ 101.2
Rent expense	$ 2.6
Guarantee Obligations | Downtown Columbia
Lessor, Lease, Description [Line Items]
Loss contingency guaranteed amount limit		$ 1.0