COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
COMMITMENTS AND CONTINGENCIES.
Outstanding surety bonds	$ 4.8	$ 4.8
Percentage of annual fees on surety bonds	1.50%
Percentage of upfront deposit on surety bonds	10.00%
Surety bonds upfront deposit amount	$ 0.5