CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ 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, 2013	130,200,000
Balance at beginning of year at Dec. 31, 2013	$ 130,200	$ 2,611,703	$ 1,295,834	$ (99,631)	$ 3,938,106
Net earnings	$ 0	0	204,923	0	$ 204,923
Common stock issued
Acquisitions, shares	715,000				715,004
Acquisitions	$ 715	44,470	0	0	$ 45,185
401(k) Trustee (Note 13), shares	485,000				485,306
401(k) Trustee (Note 13)	$ 485	30,135	0	0	$ 30,620
Share-based compensation plans, net of shares withheld for taxes, shares	507,000
Share-based compensation plans, net of shares withheld for taxes	$ 507	20,982	0	0	21,489
Share-based compensation expense	0	23,884	0	0	23,884
Excess tax benefits from share-based compensation	0	3,464	0	0	3,464
Cash dividends on common stock	0	0	(28,884)	0	(28,884)
Other comprehensive income (loss)	0	0	0	(62,083)	(62,083)
Other	$ 0	23	(28)	0	(5)
Ending balance, shares at Dec. 31, 2014	131,907,000
Balance at end 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
Common stock issued
Share-based compensation plans, net of shares withheld for taxes, shares	1,493,000
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	(228,000)
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	133,172,000
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
Common stock issued
Share-based compensation plans, net of shares withheld for taxes, shares	594,000
Share-based compensation plans, net of shares withheld for taxes	$ 594	(35,363)	0	0	(34,769)
Purchase and retirement of common stock, shares	(1,427,000)
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	132,339,000
Balance at end of year at Dec. 31, 2016	$ 132,339	$ 2,807,995	$ 1,771,518	$ (139,376)	$ 4,572,476