EMPLOYEE BENEFIT PLAN (Details) - Multiple Employers Retirement Income Plan - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee benefit plan
Interest cost	$ 490,000	$ 458,000	$ 980,000	$ 916,000
Expected return on plan assets	(650,000)	(709,000)	(1,300,000)	(1,418,000)
Amortization of net losses	230,000	206,000	460,000	412,000
Net periodic benefit cost (credit)	$ 70,000	$ (45,000)	$ 140,000	(90,000)
Employer contributions				$ 5,000,000