Consolidated Statement of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Capital in Excess of Par Value	Retained Earnings [Member]	Accumulated Other Comprehensive Income	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2020	$ 1,752,621	$ 174,792	$ (4,075)	$ 981,934	$ 560,731	$ 39,366	$ (127)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	233,960	0	0	0	228,879	5,005	76
Dividends, Common Stock	(35,568)	0	0	0	35,568	0	0
Stock option exercises	2,364	99	0	2,265	0	0	0
Restricted stock awards, net of forfeitures	0	163	0	(163)	0	0	0
Employee share-based compensation earned	3,500	0	0	3,500	0	0	0
Purchase of Company common stock	$ (106,217)	$ 0	$ (2,142)	$ (12,304)	$ (91,771)	$ 0	$ 0
Treasury Stock, Shares, Retired	0	3	3	0	0	0	0
Balance at end of period at Mar. 31, 2021	$ 1,850,660	$ 175,051	$ (6,214)	$ 975,232	$ 662,271	$ 44,371	$ (51)
Balance at beginning of period at Dec. 31, 2020	1,752,621	174,792	(4,075)	981,934	560,731	39,366	(127)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	398,683
Balance at end of period at Jun. 30, 2021	1,918,111	175,725	(7,756)	984,791	714,073	51,305	(27)
Balance at beginning of period at Mar. 31, 2021	1,850,660	175,051	(6,214)	975,232	662,271	44,371	(51)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	164,723	0	0	0	157,705	6,934	84
Dividends, Common Stock	(35,352)	0	0	0	35,352	0	0
Stock option exercises	13,972	644	0	13,328	0	0	0
Restricted stock awards, net of forfeitures	0	(3)	0	3	0	0	0
Employee share-based compensation earned	3,596	0	0	3,596	0	0	0
Purchase of Company common stock	(81,048)	0	(1,542)	(8,955)	(70,551)	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	60	0	0	0	0	0	60
Other	(1,620)	(33)	0	(1,587)	0	0	0
Balance at end of period at Jun. 30, 2021	1,918,111	175,725	(7,756)	984,791	714,073	51,305	(27)
Balance at beginning of period at Dec. 31, 2021	1,909,449	166,822	(3,708)	979,096	727,021	40,214	4
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	226,846	0	0	0	219,513	7,279	54
Dividends, Common Stock	$ (39,964)	0	0	0	(39,964)	0	0
Dividends declared per share	$ 250
Stock option exercises	$ 272	7	0	265	0	0	0
Restricted stock awards, net of forfeitures	0	147	0	(147)	0	0	0
Employee share-based compensation earned	3,687	0	0	3,687	0	0	0
Purchase of Company common stock	(256,355)	0	(4,104)	(24,613)	(227,638)	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	162	0	0	0	0	0	162
Other	1,127	0	0	1,127	0	0	0
Balance at end of period at Mar. 31, 2022	1,842,646	166,976	(7,812)	957,161	678,932	47,493	(104)
Balance at beginning of period at Dec. 31, 2021	1,909,449	166,822	(3,708)	979,096	727,021	40,214	4
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	346,125
Balance at end of period at Jun. 30, 2022	1,839,583	167,576	(9,357)	968,455	679,052	33,627	230
Balance at beginning of period at Mar. 31, 2022	1,842,646	166,976	(7,812)	957,161	678,932	47,493	(104)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	119,279	0	0	0	132,670	(13,866)	475
Dividends, Common Stock	$ (39,663)	0	0	0	(39,663)	0	0
Dividends declared per share	$ 250
Stock option exercises	$ 15,925	574	0	15,351	0	0	0
Restricted stock awards, net of forfeitures	0	2	0	(2)	0	0	0
Employee share-based compensation earned	3,713	0	0	3,713	0	0	0
Purchase of Company common stock	(103,759)	0	(1,545)	(9,327)	(92,887)	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	141	0	0	0	0	0	141
Other	(1,583)	(24)	0	(1,559)	0	0	0
Balance at end of period at Jun. 30, 2022	$ 1,839,583	$ 167,576	$ (9,357)	$ 968,455	$ 679,052	$ 33,627	$ 230