Other Comprehensive Income (Loss) Other Comprehensive Income Balance Components (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Pension obligation adjustment	$ (6,262)	$ (23,973)
Retiree medical obligation adjustment	29,660	28,605
Unrealized gain (loss) on available-for-sale securities	(4)	(7)
Unrealized gain (loss) on hedging activities, net of noncontrolling interest	12,780	(13,050)
Accumulated other comprehensive income (loss)	$ 36,174	$ (8,425)

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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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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