CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance, shares at Dec. 31, 2014	131,907
Balance at beginning of year at Dec. 31, 2014	$ 131,907	$ 2,734,661	$ 1,471,845	$ (161,714)	$ 4,176,699
Net earnings	$ 0	0	221,177	0	221,177
Share-based compensation plans, net of shares withheld for taxes, shares	1,493
Share-based compensation plans, net of shares withheld for taxes	$ 1,493	51,240	0	0	52,733
Purchase and retirement of common stock, shares	(228)
Purchase and retirement of common stock	$ (228)	0	(21,247)	0	(21,475)
Share-based compensation expense	0	18,248	0	0	18,248
Excess tax benefits from share-based compensation	0	18,376	0	0	18,376
Cash dividends on common stock	0	0	(53,214)	0	(53,214)
Other comprehensive income (loss)	0	0	0	41,645	41,645
Other	$ 0	53	(54)	0	(1)
Ending balance, shares at Dec. 31, 2015	133,172
Balance at end of year at Dec. 31, 2015	$ 133,172	2,822,578	1,618,507	(120,069)	4,454,188
Net earnings	$ 0	0	419,491	0	419,491
Share-based compensation plans, net of shares withheld for taxes, shares	594
Share-based compensation plans, net of shares withheld for taxes	$ 594	(35,363)	0	0	(34,769)
Purchase and retirement of common stock, shares	(1,427)
Purchase and retirement of common stock	$ (1,427)	0	(160,036)	0	(161,463)
Share-based compensation expense	0	20,670	0	0	20,670
Cash dividends on common stock	0	0	(106,333)	0	(106,333)
Other comprehensive income (loss)	0	0	0	(19,307)	(19,307)
Other	$ 0	110	(111)	0	(1)
Ending balance, shares at Dec. 31, 2016	132,339
Balance at end of year at Dec. 31, 2016	$ 132,339	2,807,995	1,771,518	(139,376)	4,572,476
Net earnings	$ 0	0	601,185	0	601,185
Share-based compensation plans, net of shares withheld for taxes, shares	495
Share-based compensation plans, net of shares withheld for taxes	$ 495	(29,168)	0	0	(28,673)
Purchase and retirement of common stock, shares	(510)
Purchase and retirement of common stock	$ (510)	0	(59,793)	0	(60,303)
Share-based compensation expense	0	26,635	0	0	26,635
Cash dividends on common stock	0	0	(132,335)	0	(132,335)
Other comprehensive income (loss)	0	0	0	(10,090)	(10,090)
Other	$ 0	125	(127)	0	(2)
Ending balance, shares at Dec. 31, 2017	132,324
Balance at end of year at Dec. 31, 2017	$ 132,324	$ 2,805,587	$ 2,180,448	$ (149,466)	$ 4,968,893