Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated other comprehensive income (loss), beginning balance	$ (20,916)
Net current-period other comprehensive income (loss)	(8,305)	16,478	117,081
Accumulated other comprehensive income (loss), ending balance	(29,221)	(20,916)
Derivatives [Member]
Accumulated other comprehensive income (loss), beginning balance			(1,306)
Other comprehensive income (loss) before reclassification			(415)
Amounts reclassified from accumulated other comprehensive income (loss)			1,721
Net current-period other comprehensive income (loss)			1,306
Available-for-sale Securities [Member]
Accumulated other comprehensive income (loss), beginning balance			580
Other comprehensive income (loss) before reclassification			(120)
Amounts reclassified from accumulated other comprehensive income (loss)			(460)
Net current-period other comprehensive income (loss)			(580)
Postretirement Benefits [Member]
Accumulated other comprehensive income (loss), beginning balance	(9,171)	(17,653)	(132,695)
Other comprehensive income (loss) before reclassification	(5,147)	3,102	1,668
Amounts reclassified from accumulated other comprehensive income (loss)	336	5,380	113,374
Net current-period other comprehensive income (loss)	(4,811)	8,482	115,042
Accumulated other comprehensive income (loss), ending balance	(13,982)	(9,171)	(17,653)
Proportionate Share of Telesat Other Comprehensive Loss [Member]
Accumulated other comprehensive income (loss), beginning balance	(11,745)	(19,741)	(21,054)
Other comprehensive income (loss) before reclassification	(3,494)	7,996	1,313
Net current-period other comprehensive income (loss)	(3,494)	7,996	1,313
Accumulated other comprehensive income (loss), ending balance	(15,239)	(11,745)	(19,741)
Accumulated Other Comprehensive Loss [Member]
Accumulated other comprehensive income (loss), beginning balance	(20,916)	(37,394)	(154,475)
Other comprehensive income (loss) before reclassification	(8,641)	11,098	2,446
Amounts reclassified from accumulated other comprehensive income (loss)	336	5,380	114,635
Net current-period other comprehensive income (loss)	(8,305)	16,478	117,081
Accumulated other comprehensive income (loss), ending balance	$ (29,221)	$ (20,916)	$ (37,394)

- 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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