- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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STOCKHOLDERS' EQUITY AND ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income by component (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (63,595)	$ (148,345)	$ (121,455)
Other comprehensive income before reclassifications	(61,971)
Amounts reclassified from accumulated other comprehensive income (loss)	1,270
Balance at end of period	(124,296)	(148,345)	(121,455)
Accumulated Defined Benefit Plans Adjustment [Member] \| Postretirement Medical Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(20,292)
Other comprehensive income before reclassifications	(19,442)
Amounts reclassified from accumulated other comprehensive income (loss)	18
Balance at end of period	(39,716)
Accumulated Defined Benefit Plans Adjustment [Member] \| Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(12,255)
Other comprehensive income before reclassifications	(24,793)
Amounts reclassified from accumulated other comprehensive income (loss)	983
Balance at end of period	(36,065)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0
Other comprehensive income before reclassifications	144
Amounts reclassified from accumulated other comprehensive income (loss)	269
Balance at end of period	413
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0
Other comprehensive income before reclassifications	(17,880)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Balance at end of period	(17,880)
Tax Effect of Other Comprehensive Income Gains [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(31,048)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income (loss)	0
Balance at end of period	$ (31,048)