EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Pension Plan [Member]
Components of Net Periodic Benefit Costs:
Service Cost	$ 1,613	$ 1,715	$ 4,839	$ 5,145
Interest Cost	1,397	1,438	4,191	4,313
Expected Return on Plan Assets	(1,934)	(1,955)	(5,802)	(5,865)
Prior Service Cost Amortization	69	77	207	232
Net Gain (Loss) Amortization	801	891	2,403	2,673
Net Periodic Benefit Cost (Income)	$ 1,946	$ 2,166	$ 5,838	$ 6,498
Discount Rate (in percent)	4.52%	4.15%	4.52%	4.15%
Long-Term Rate of Return on Assets (in percent)	7.50%	7.50%	7.50%	7.50%
Supplemental Executive Retirement Plan [Member]
Components of Net Periodic Benefit Costs:
Interest Cost	$ 40	$ 34	$ 120	$ 101
Prior Service Cost Amortization	0	2	0	5
Net Gain (Loss) Amortization	190	44	570	134
Net Periodic Benefit Cost (Income)	$ 230	$ 80	$ 690	$ 240
Discount Rate (in percent)	4.13%	4.15%	4.13%	4.15%