DEFINED CONTRIBUTION PLAN (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
DEFINED CONTRIBUTION PLAN
Company's expense under matching requirements	$ 600,000	$ 500,000	$ 1,800,000	$ 1,700,000
Matching contribution not yet merged	$ 47,000		$ 47,000