Accumulated Other Comprehensive Income / (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2014 Net Gains/ (Losses) on Cash Flow Hedges	Mar. 31, 2014 Postretirement Benefits	Dec. 31, 2013 Postretirement Benefits
Changes in accumulated other comprehensive income / (loss) by component, net of tax
Balance at beginning of period	$ (8,361)	$ (6,551)	$ (1,810)	$ (1,810)
Other comprehensive income before reclassifications	(80,175)	(80,175)
Amounts reclassified from accumulated other comprehensive income	42,565	42,565
Net current-period other comprehensive income	(37,610)	(37,610)
Balance at end of period	$ (45,971)	$ (44,161)	$ (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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