BENEFIT PLANS (Fair values of Pension Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 756,624		$ 683,091		$ 636,648
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	756,624		683,091
Pension Plans, Defined Benefit | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	137,034		155,874
Pension Plans, Defined Benefit | Commodity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	23,773		27,906
Pension Plans, Defined Benefit | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	490,957		393,002
Pension Plans, Defined Benefit | Short Term Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	16,378		8,298
Pension Plans, Defined Benefit | Venture Capital And Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	88,482		98,011
Fair Value, Inputs, Level 1 | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	602	[1]	12,801	[1]
Fair Value, Inputs, Level 1 | Pension Plans, Defined Benefit | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 1 | Pension Plans, Defined Benefit | Commodity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 1 | Pension Plans, Defined Benefit | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	602	[1]	4,503	[1]
Fair Value, Inputs, Level 1 | Pension Plans, Defined Benefit | Short Term Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	8,298	[1]
Fair Value, Inputs, Level 1 | Pension Plans, Defined Benefit | Venture Capital And Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 2 | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	667,540	[1]	572,279	[1]
Fair Value, Inputs, Level 2 | Pension Plans, Defined Benefit | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	137,034	[1]	155,874	[1]
Fair Value, Inputs, Level 2 | Pension Plans, Defined Benefit | Commodity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	23,773	[1]	27,906	[1]
Fair Value, Inputs, Level 2 | Pension Plans, Defined Benefit | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	490,355	[1]	388,499	[1]
Fair Value, Inputs, Level 2 | Pension Plans, Defined Benefit | Short Term Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	16,378	[1]	0	[1]
Fair Value, Inputs, Level 2 | Pension Plans, Defined Benefit | Venture Capital And Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 3 | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	88,482	[1]	98,011	[1]
Fair Value, Inputs, Level 3 | Pension Plans, Defined Benefit | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 3 | Pension Plans, Defined Benefit | Commodity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 3 | Pension Plans, Defined Benefit | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 3 | Pension Plans, Defined Benefit | Short Term Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 3 | Pension Plans, Defined Benefit | Venture Capital And Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 88,482	[1]	$ 98,011	[1]

[1] See Note 1 under the caption Fair Value Measurements for a description of the fair value hierarchy.