Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2014	Sep. 30, 2014 Net Gain (Loss) on Cash Flow Hedges	Sep. 30, 2014 Postretirement Benefits	Dec. 31, 2013 Postretirement Benefits
Changes in accumulated other comprehensive income (loss) by component, net of tax
Balance at December 31, 2013	$ (8,361)	$ (6,551)	$ (1,810)	$ (1,810)
Other comprehensive income before reclassifications	(80,175)	(80,175)
Amounts reclassified from accumulated other comprehensive income	69,337	69,337
Net current-period other comprehensive income	(10,838)	(10,838)
Balance at September 30, 2014	$ (19,199)	$ (17,389)	$ (1,810)	$ (1,810)

- 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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