Consolidated Statement of Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock, Common	Capital in Excess of Par Value	Retained Earnings [Member]	Accumulated Other Comprehensive Income	Noncontrolling Interest
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	$ 0.25
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	444,984
Balance at end of period at Sep. 30, 2022	1,677,422	167,599	(12,861)	951,247	559,631	11,586	220
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	$ 0.25
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
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	98,859	0	0	0	120,850	(22,041)	50
Dividends, Common Stock	$ (38,808)	0	0	0	38,808	0	0
Dividends declared per share	$ 0.25
Stock option exercises	$ 643	23	0	620	0	0	0
Restricted stock awards, net of forfeitures	0	0	(1)	1	0	0	0
Employee share-based compensation earned	3,663	0	0	3,663	0	0	0
Purchase of Company common stock	(226,448)	0	(3,503)	(21,482)	(201,463)	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	60	0	0	0	0	0	60
Other	10	0	0	10	0	0	0
Balance at end of period at Sep. 30, 2022	1,677,422	167,599	(12,861)	951,247	559,631	11,586	220
Balance at beginning of period at Dec. 31, 2022	1,673,423	156,089	(2,149)	958,329	544,384	16,538	232
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	145,127	0	0	0	144,763	299	65
Dividends, Common Stock	$ (41,207)	0	0	0	41,207	0	0
Dividends declared per share	$ 270
Stock option exercises	$ 8,763	298	0	8,465	0	0	0
Restricted stock awards, net of forfeitures	0	132	1	(133)	0	0	0
Employee share-based compensation earned	4,478	0	0	4,478	0	0	0
Purchase of Company common stock	(167,305)	0	(2,432)	(16,500)	(148,373)	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	107	0	0	0	0	0	107
Other	1,271	0	0	1,271	0	0	0
Balance at end of period at Mar. 31, 2023	1,621,901	156,519	(4,580)	953,368	499,567	16,837	190
Balance at beginning of period at Dec. 31, 2022	1,673,423	156,089	(2,149)	958,329	544,384	16,538	232
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	398,009
Balance at end of period at Sep. 30, 2023	1,630,695	156,835	(7,280)	950,739	514,811	15,326	264
Balance at beginning of period at Mar. 31, 2023	1,621,901	156,519	(4,580)	953,368	499,567	16,837	190
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	140,137	0	0	0	132,188	7,784	165
Dividends, Common Stock	$ (40,780)	0	0	0	40,780	0	0
Dividends declared per share	$ 270
Stock option exercises	$ 5,801	232	0	5,569	0	0	0
Restricted stock awards, net of forfeitures	0	0	0	0	0	0	0
Employee share-based compensation earned	3,671	0	0	3,671	0	0	0
Purchase of Company common stock	(86,859)	0	(1,260)	(8,603)	(76,996)	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	101	0	0	0	0	0	101
Other	(1,621)	(24)	0	(1,597)	0	0	0
Balance at end of period at Jun. 30, 2023	1,645,391	156,775	(5,840)	955,602	513,979	24,621	254
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	112,745	0	0	0	121,971	(9,295)	69
Dividends, Common Stock	$ (43,556)	0	0	0	43,556	0	0
Dividends declared per share	$ 290
Stock option exercises	$ 1,542	60	0	1,482	0	0	0
Restricted stock awards, net of forfeitures	0	0	0	0	0	0	0
Employee share-based compensation earned	3,637	0	0	3,637	0	0	0
Purchase of Company common stock	(89,005)	0	(1,440)	(9,982)	(77,583)	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	59	0	0	0	0	0	59
Balance at end of period at Sep. 30, 2023	$ 1,630,695	$ 156,835	$ (7,280)	$ 950,739	$ 514,811	$ 15,326	$ 264