SHAREHOLDERS' 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		6 Months Ended
	Jun. 30, 2014		Jun. 30, 2014
Pension
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Actuarial losses	$ 359	[1],[2]	$ 717	[1],[2]
Postretirement Medical Benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	(159)	[1],[3]	(318)	[1],[3]
Actuarial losses	164	[1],[3]	328	[1],[3]
Amortization of defined benefit pension and postretirement medical benefits	$ 5	[1]	$ 10	[1]

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

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

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