Comprehensive Income (Accumulated Other Comprehensive Loss, Net of Tax) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Pension Benefits [Member]	Mar. 31, 2013 Pension Benefits [Member]	Mar. 31, 2014 Postretirement Costs [Member]	Mar. 31, 2013 Postretirement Costs [Member]	Mar. 31, 2014 Deferred Taxes On Pension And OPEB Costs [Member]	Mar. 31, 2013 Deferred Taxes On Pension And OPEB Costs [Member]	Mar. 31, 2014 All Other [Member]	Mar. 31, 2013 All Other [Member]	Dec. 31, 2012 All Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	$ (260,530)	$ (483,576)	$ (411,432)	$ (697,874)	$ (5,230)	$ (74,264)	$ 156,280	$ 288,712	$ (148)	$ (150)	$ (150)
Other comprehensive income before reclassifications	148	64		(229)				293	148
Amounts reclassified from accumulated other comprehensive loss	2,891	6,682	4,830	10,074	(168)	703	(1,771)	(4,095)
Net current-period other comprehensive income (loss)	3,039	6,746	4,830	9,845	(168)	703	(1,771)	(3,802)	148
Balance, ending	$ (257,491)	$ (476,830)	$ (406,602)	$ (688,029)	$ (5,398)	$ (73,561)	$ 154,509	$ 284,910		$ (150)	$ (150)