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, 2020	$ 1,752,621
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	804,098
Dividends	(146,919)
Stock option exercises	39,677
Restricted stock awards, net of forfeitures	0
Employee share-based compensation earned	14,168
Purchase of Company common stock	554,636
Noncontrolling interest payments	$ (180)
Retirement of treasury shares	0
Other	$ 620
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
Dividends	(160,035)
Stock option exercises	14,709
Restricted stock awards, net of forfeitures	28,094
Employee share-based compensation earned	0
Purchase of Company common stock	661,130
Noncontrolling interest payments	$ (463)
Retirement of treasury shares	0
Other	$ 446
Balance at end of period at Dec. 31, 2022	1,673,423	156,089	(2,149)	958,329	16,538	544,384	232
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	546,014
Dividends	(167,983)
Stock option exercises	15,423
Restricted stock awards, net of forfeitures	24,181
Employee share-based compensation earned	0
Purchase of Company common stock	549,568
Noncontrolling interest payments	$ (367)
Retirement of treasury shares	0
Other	$ 350
Balance at end of period at Dec. 31, 2023	$ 1,541,473	$ 148,298	$ (1,975)	$ 937,596	$ 24,891	$ 432,454	$ 209