PENSION PLANS (Schedule of Aggregate Net Pension Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefit Expense [Abstract]
Service costs	$ 1,352	$ 1,526	$ 1,795
Interest costs	1,394	1,509	1,430
Amortization of actuarial loss	772	47	376
Settlement and other related gain	0		(59)
Settlement and other related gain	(1,699)	0	(1,607)
Net pension period cost	$ 1,819	$ 3,082	$ 1,935