RETIREMENT PLAN AND POST-RETIREMENT BENEFITS, Plan Obligations, Plan Assets and Funded Status (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
United States Pension Plans of US Entity, Defined Benefit [Member]
Change in Benefit Obligations [Rollforward]
Benefit obligation, January 1	$ 842,045		$ 806,034
Service cost	17,627		18,427		18,910
Interest cost	40,912		40,676		42,872
Plan participants' contributions	0		0
Actuarial loss (gain)	107,936		18,552
Benefits paid	(73,017)		(42,507)	[1]
Plan amendments	0		577
Special termination benefits	0		286
Remeasurement adjustment	0		0
Benefit obligation, December 31	935,503		842,045		806,034
Change in Plan Assets [Rollforward]
Fair value of plan net assets, January 1	811,480		729,940
Actual return on plan assets	86,073		78,104
Employer contributions	16,511		41,286
Plan participants' contributions	0		0
Benefits paid	(73,017)		(37,850)	[1]
Fair value of plan net assets, December 31	841,047		811,480		729,940
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	(94,456)	[2]	(30,565)	[2]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	6.15%		6.75%		6.75%
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Change in Benefit Obligations [Rollforward]
Benefit obligation, January 1	152,039		163,423
Service cost	2,383		2,611		2,466
Interest cost	7,620		8,360		8,736
Plan participants' contributions	1,814		2,325
Actuarial loss (gain)	13,074		(12,525)
Benefits paid	(11,187)		(12,255)
Plan amendments	262		0
Special termination benefits	0		100
Remeasurement adjustment	0		0
Benefit obligation, December 31	166,005		152,039		163,423
Change in Plan Assets [Rollforward]
Fair value of plan net assets, January 1	93,196		93,648
Actual return on plan assets	11,140		8,615
Employer contributions	7,370		863
Plan participants' contributions	1,814		2,325
Benefits paid	(11,187)		(12,255)
Fair value of plan net assets, December 31	102,333		93,196		93,648
Defined Benefit Plan, Funded Status of Plan [Abstract]
Funded status	$ (63,672)	[2]	$ (58,843)	[2]

[1] The 2011 difference between benefits paid in the table of changes in pension obligations and the table of changes in plan assets, is due to a difference in benefit payments recognized by the pension actuary from the actual benefit payments made by the trustee bank in order to facilitate timely benefit payments to participants.

[2] Amounts recognized as non-current liabilities (accrued retirement benefits) in the consolidated balance sheets as of December 31, 2012 and 2011.