Consolidated Statement of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Capital in Excess of Par Value	Accumulated Other Comprehensive Income	Retained Earnings [Member]	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2019	$ 1,823,255	$ 185,101	$ (3,916)	$ 1,010,361	$ 29,864	$ 601,903	$ (58)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Stockholders' Equity, Period Increase (Decrease)	16,989	0	0	0	0	16,989	0
Comprehensive income	525,644	0	0	0	9,502	515,907	235
Dividends	(137,392)	0	0	0	0	(137,392)
Stock option exercises	26,671	1,361	0	25,310	0	0	0
Restricted stock awards, net of forfeitures	0	170	0	(170)	0	0	0
Employee share-based compensation earned	14,103	0	0	14,103	0	0	0
Purchase of Company common stock	516,870	0	12,043	68,151	0	436,676	0
Noncontrolling interest payments	$ (304)	$ 0	$ 0	$ 0	$ 0	$ 0	$ (304)
Retirement of treasury shares	0	(11,884)	(11,884)	0	0	0	0
Other	$ 525	$ 44	$ 0	$ 481	$ 0	$ 0	$ 0
Balance at end of period at Dec. 31, 2020	1,752,621	174,792	(4,075)	981,934	39,366	560,731	(127)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	804,098	0	0	0	848	802,939	311
Dividends	(146,919)	0	0	0	0	(146,919)
Stock option exercises	39,677	1,642	0	38,035	0	0	0
Restricted stock awards, net of forfeitures	0	163	0	(163)	0	0	0
Employee share-based compensation earned	14,168	0	0	14,168	0	0	0
Purchase of Company common stock	554,636	0	9,438	55,468	0	489,730	0
Noncontrolling interest payments	$ (180)	$ 0	$ 0	$ 0	$ 0	$ 0	$ (180)
Retirement of treasury shares	0	(9,805)	(9,805)	0	0	0	0
Other	$ 620	$ 30	$ 0	$ 590	$ 0	$ 0	$ 0
Balance at end of period at Dec. 31, 2021	1,909,449	166,822	(3,708)	979,096	40,214	727,021	4
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	542,353	0	0	0	(23,676)	565,338	691
Dividends	(160,035)	0	0	0	0	(160,035)
Stock option exercises	28,094	1,010	0	27,084	0	0	0
Restricted stock awards, net of forfeitures	0	149	(1)	(148)	0	0	0
Employee share-based compensation earned	14,709	0	0	14,709	0	0	0
Purchase of Company common stock	661,130	0	10,356	62,834	0	587,940	0
Noncontrolling interest payments	$ (463)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 463
Retirement of treasury shares	0	(11,916)	(11,916)	0	0	0	0
Other	$ 446	$ 24	$ 0	$ 422	$ 0	$ 0	$ 0
Balance at end of period at Dec. 31, 2022	$ 1,673,423	$ 156,089	$ (2,149)	$ 958,329	$ 16,538	$ 544,384	$ 232