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, 2012	129,721,000
Beginning balance at Dec. 31, 2012	$ 129,721	$ 2,580,209	$ 1,276,649	$ (225,517)	$ 3,761,062
Net earnings	$ 0	0	24,382	0	$ 24,382
Common stock issued
401(k) Trustee (Note 13), shares	71,000				71,208
401(k) Trustee (Note 13)	$ 71	3,750	0	0	$ 3,821
Share-based compensation plans, shares	408,000
Share-based compensation plans	$ 408	5,485	0	0	5,893
Share-based compensation expense	0	22,093	0	0	22,093
Excess tax benefits from share-based compensation	0	161	0	0	161
Cash dividends on common stock	0	0	(5,191)	0	(5,191)
Other comprehensive income (loss)	0	0	0	125,886	125,886
Other	$ 0	5	(6)	0	(1)
Ending balance, shares at Dec. 31, 2013	130,200,000
Ending balance 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, shares	507,000
Share-based compensation plans	$ 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
Ending balance 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, shares	1,493,000
Share-based compensation plans	$ 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	(21,251)	0	(21,479)
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	(50)	0	3
Ending balance, shares at Dec. 31, 2015	133,172,000
Ending balance at Dec. 31, 2015	$ 133,172	$ 2,822,578	$ 1,618,507	$ (120,069)	$ 4,454,188