COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 16, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Plan
Components of net periodic benefit cost:
Service cost		$ 524	$ 618	$ 1,720	$ 1,855
Interest cost		1,118	1,074	3,381	3,222
Expected return on plan assets		(1,363)	(1,398)	(3,937)	(4,193)
Amortization of net loss		787	839	2,365	2,516
Net periodic benefit cost		$ 1,066	$ 1,133	3,529	$ 3,400
2015 plan year
Components of net periodic benefit cost:
Employer contribution				600
2016 plan year
Components of net periodic benefit cost:
Employer contribution	$ 700			$ 1,300