EMPLOYEE BENEFIT PLAN (Details) - Multiple Employers Retirement Income Plan - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee benefit plan
Interest cost	$ 490,000	$ 458,000	$ 1,470,000	$ 1,374,000
Expected return on plan assets	(649,000)	(710,000)	(1,949,000)	(2,128,000)
Amortization of net losses	229,000	206,000	689,000	618,000
Net periodic benefit cost (credit)	$ 70,000	$ (46,000)	$ 210,000	(136,000)
Employer contributions				$ 5,000,000