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	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Common Stock	Cumulative Effect, Period of Adoption, Adjustment Treasury Stock	Cumulative Effect, Period of Adoption, Adjustment Capital in Excess of Par Value	Cumulative Effect, Period of Adoption, Adjustment Accumulated Other Comprehensive Income	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2018	$ 1,641,815	$ 184,721	$ (3,250)	$ 972,710	$ 13,395	$ 474,327	$ (88)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	386,241	0	0	0	16,469	369,596	176
Dividends	(131,402)	0	0	0	0	(131,402)
Stock option exercises	40,922	2,394	0	38,528	0	0	0
Restricted stock awards, net of forfeitures	0	126	0	(126)	0	0	0
Employee share-based compensation earned	15,029	0	0	15,029	0	0	0
Purchase of Company common stock	129,589	0	2,909	16,062	0	110,618	0
Noncontrolling interest payments	$ (146)	$ 0	$ 0	$ 0	$ 0	$ 0	$ (146)
Retirement of treasury shares	0	(2,243)	(2,243)	0	0	0	0
Other	$ 385	$ 103	$ 0	$ 282	$ 0	$ 0	$ 0
Balance at end 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