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, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity (Parenthetical) [Abstract]
Employee benefit plans, net of deferred tax	$ 50,899	$ 118,927	$ 24,108
Unrealized gain (loss) on available-for-sale security, net of deferred tax	0	0	145
Exercise of stock options, net of tax	862	1,531	165
Share-based compensation, net of tax	$ 809	$ 200	$ 986
Cash dividends declared	$ 0.50	$ 0.40	$ 0.40