STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of Accumulated Other Comprehensive Income (Details) (Defined benefit plans adjustment, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Pension
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Actuarial losses	$ 741	[1],[2]
Postretirement Medical Benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	(159)	[1],[3]
Actuarial losses	1,160	[1],[3]
Amortization of defined benefit pension and postretirement medical benefits	$ 1,001	[1]

[1] Amounts in parentheses indicate debits to income/loss.

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. (See Note 7 - Pensions for additional details)

[3] These accumulated other comprehensive income components are included in the computation of net periodic postretirement medical cost. (See Note 7 - Postretirement Medical Benefits for additional details)