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, 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	28,094
Restricted stock awards, net of forfeitures	0
Employee share-based compensation earned	14,709
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]
Dividends declared per share	$ 1.02
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
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Dividends declared per share	$ 1.12
Comprehensive income	$ 486,632
Dividends	(174,282)
Stock option exercises	17,163
Restricted stock awards, net of forfeitures	56,683
Employee share-based compensation earned	0
Purchase of Company common stock	249,765
Noncontrolling interest payments	$ 359
Retirement of treasury shares	0
Other	$ 406
Balance at end of period at Dec. 31, 2024	$ 1,678,669	$ 146,670	$ (1,975)	$ 986,830	$ (7,221)	$ 553,701	$ 664
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Dividends declared per share	$ 1.20