BENEFIT PLANS (Reconciliation of Fair Value Measurements of Pension Plan Assets Using Significant Unobservable Inputs ( Level 3)) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
BENEFIT PLANS [Abstract]
Fair value of assets at beginning of year		$ 109,933	$ 88,482
Total gains (losses) for the period	[1]	5,186	34,071
Purchases, sales and settlements, net		(12,247)	(12,940)
Transfers into (out of) of Level 3		0	320
Fair value of assets at end of year		102,872	109,933
Unrealized gains related to assets still held		$ 47	$ 29,329

[1] The total gains (losses) for 2015 and 2014 include $47 thousand and $29,329 thousand, respectively, in unrealized gains related to assets still held as of their respective year ends.