Statements Of Consolidated Shareholders' Equity Statements Of Consolidated Shareholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Stockholders' Equity (Parenthetical) [Abstract]
Employee benefit plans, net of deferred tax	$ 24,108	$ 100,520	$ 31,564
Unrealized gain(loss) on available-for-sale security, net of deferred tax	145	4	19
Exercise of stock options, net of tax	165	629	397
Share-based compensation, net of tax	$ 986	$ 1,966	$ 269
Common dividends declared	$ 0.40	$ 0.40	$ 0.40