Consolidated Statement Of Changes In Stockholders' Equity (USD $) In Thousands	Total	COMMON STOCK (Par Value: $0.01):	PAID-IN CAPITAL IN EXCESS OF PAR:	RETAINED EARNINGS:	TREASURY STOCK:	ACCUMULATED OTHER COMPREHENSIVE LOSS, NET OF TAX:
Balance at beginning of year at Dec. 31, 2010		$ 4,356	$ 5,285,715	$ 281,844		$ (45,695)
Shares issued for restricted stock awards, net of forfeitures		16	(216)		200
Net income	480,037			480,037
Purchase of common stock (383,640; 272,991; and 229,712 shares, respectively)					(3,696)
Other comprehensive income (loss), net of tax:	(26,215)					(26,215)
Compensation expense related to restricted stock awards			16,735
Dividends paid on common stock ($1.00 per share in each year)				(436,914)
Exercise of stock options		2	4,356		2,500
Tax effect of stock plans	2,679		2,679
Balance at end of period at Dec. 31, 2011	5,565,704	4,374	5,309,269	324,967	(996)	(71,910)
Shares issued for restricted stock awards, net of forfeitures		17	(3,430)		3,451
Net income	501,106			501,106
Purchase of common stock (383,640; 272,991; and 229,712 shares, respectively)					(3,522)
Other comprehensive income (loss), net of tax:	10,205					10,205
Compensation expense related to restricted stock awards			20,683
Dividends paid on common stock ($1.00 per share in each year)				(438,539)
Tax effect of stock plans	589		589
Balance at end of period at Dec. 31, 2012	5,656,264	4,391	5,327,111	387,534	(1,067)	(61,705)
Shares issued for restricted stock awards, net of forfeitures		18	(5,093)		5,075
Net income	475,547			475,547
Purchase of common stock (383,640; 272,991; and 229,712 shares, respectively)					(5,319)
Other comprehensive income (loss), net of tax:	25,212					25,212
Compensation expense related to restricted stock awards			22,247
Dividends paid on common stock ($1.00 per share in each year)				(440,308)
Exercise of stock options			60	(12)	279
Tax effect of stock plans	1,692		1,692
Balance at end of period at Dec. 31, 2013	$ 5,735,662	$ 4,409	$ 5,346,017	$ 422,761	$ (1,032)	$ (36,493)