EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) pension_plan	Jun. 30, 2016 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Number of qualified defined benefit plans | pension_plan			1
Weighted-average expected long-term rate of return on plan assets			7.20%
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 327	$ 0	$ 653
Interest cost	815	869	1,630	1,737
Expected return on plan assets	(945)	(1,008)	(1,891)	(2,015)
Amortization of losses	116	632	233	1,261
Net periodic benefit (gain) cost	(14)	820	(28)	1,636
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	13	2	26	3
Interest cost	2	12	3	24
Expected return on plan assets	0	0	0	0
Amortization of losses	0	0	0	(12)
Net periodic benefit (gain) cost	$ 15	$ 14	$ 29	$ 15