SHAREHOLDERS' DEFICIT AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2015	Sep. 30, 2015
Defined benefit plans adjustment | Pension
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	[1]	$ 2	$ 6
Actuarial losses	[1],[2]	1,032	3,295
Amortization of defined benefit pension and postretirement medical benefits	[1]	1,034	3,301
Defined benefit plans adjustment | Postretirement Medical Benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	[1],[3]	(159)	(477)
Actuarial losses	[1],[3]	486	1,458
Amortization of defined benefit pension and postretirement medical benefits	[1]	327	981
Other income (loss) | Unrealized Gains and Losses on Available-for-sale Securities, Net
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized gains and losses on available-for sale securities	[1]	$ 19	$ 143

[1] Amounts in parentheses indicate amounts recognized as income. Amounts with no parenthesis were recognized as expenses or losses.

[2] These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. (See Note 8 - Pension for additional details)

[3] These accumulated other comprehensive loss components are included in the computation of net periodic postretirement medical cost. (See Note 8 - Postretirement Medical Benefits for additional details)