Condensed Consolidated Statement of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Consolidated Statement of Comprehensive Income
Net actuarial gains (losses) and amortization of net actuarial losses and prior service cost and credits, taxes	$ 8,905	$ 18,122	$ (32,244)	$ 63,737
Unrealized (losses) gains on marketable equity securities, taxes	(4,342)	2,238	(2,475)	4,679
Net adjustments for derivative instruments designated as cash flow hedges and other, taxes	$ (2,666)	$ (9,537)	$ (8,539)	$ (20,664)