SHAREHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Unrealized and realized gains and losses on available-for-sale securities	$ (16)		$ (25)	$ (55)		$ (248)
Available for sale securities
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Unrealized and realized gains and losses on available-for-sale securities	0			(12)
Defined benefit plans adjustment | Pension
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Actuarial losses	872	[1],[2]		2,617
Defined benefit plans adjustment | Postretirement Medical Benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	(159)	[1],[3]		(477)
Actuarial losses	1,161	[1],[3]		3,481
Amortization of defined benefit pension and postretirement medical benefits	1,002	[1]		3,004	[1]
Other income (loss) | Available for sale securities
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized gains and losses on available-for sale securities	$ 0			$ (12)

[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 - Pension 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)