BENEFIT PLANS (Reconciliation of Fair Value Measurements of Pension Plan Assets Using Significant Unobservable Inputs ( Level 3)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unrealized gains related to assets still held	$ 29,329
Fair Value, Inputs, Level 3 | Venture Capital And Partnerships [Member] | Pension Plans, Defined Benefit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of assets at beginning of year	88,482		98,011
Total gains (losses) for the period	34,071	[1]	10,581
Purchases, sales and settlements, net	(12,940)		(20,110)
Transfers in (out) of Level 3	320		0
Fair value of assets at end of year	$ 109,933		$ 88,482

[1] The total gains for the period include $29,329 thousand in unrealized gains related to assets still held at December 31, 2014.