CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands		Total	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2022			$ 49,187	$ 134,553	$ 3,163,491	$ (258,916)	$ (1,107,101)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		$ 234,623			234,623
Other comprehensive income, net of tax		5,500				5,500
Dividends paid					(22,612)
Restricted stock				(13,878)			13,878
Employee stock purchase plan				3,312			7,271
Share-based compensation				12,884			329
Repurchases of common stock	[1]						(37,366)
Other				(261)			261
Ending Balance at Sep. 30, 2023			49,187	136,610	3,375,502	(253,416)	(1,122,728)
Beginning Balance at Dec. 31, 2022			49,187	134,553	3,163,491	(258,916)	(1,107,101)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income, net of tax		45,693
Ending Balance at Dec. 31, 2023		2,328,413	49,187	140,182	3,487,751	(213,223)	(1,135,484)
Beginning Balance at Jun. 30, 2023			49,187	130,846	3,286,376	(225,375)	(1,113,675)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		96,778			96,778
Other comprehensive income, net of tax		(28,041)				(28,041)
Dividends paid					(7,652)
Employee stock purchase plan				1,829			3,529
Share-based compensation				3,935			419
Repurchases of common stock	[1]						(13,001)
Ending Balance at Sep. 30, 2023			49,187	136,610	3,375,502	(253,416)	(1,122,728)
Beginning Balance at Dec. 31, 2023		2,328,413	49,187	140,182	3,487,751	(213,223)	(1,135,484)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		287,126			287,126
Other comprehensive income, net of tax		9,795				9,795
Dividends paid					(23,694)
Restricted stock				(13,944)			13,944
Employee stock purchase plan				5,714			5,631
Share-based compensation				14,934			230
Repurchases of common stock	[1]						(137,580)
Other				(2,492)			2,342
Ending Balance at Sep. 30, 2024		2,490,419	49,187	144,394	3,751,183	(203,428)	(1,250,917)
Beginning Balance at Jun. 30, 2024			49,187	135,574	3,648,005	(233,488)	(1,140,858)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		111,160			111,160
Other comprehensive income, net of tax		30,060				30,060
Dividends paid					(7,982)
Restricted stock				(65)			65
Employee stock purchase plan				3,230			2,643
Share-based compensation				5,683			15
Repurchases of common stock	[1]						(112,784)
Other				(28)			2
Ending Balance at Sep. 30, 2024		$ 2,490,419	$ 49,187	$ 144,394	$ 3,751,183	$ (203,428)	$ (1,250,917)

[1] For the three and nine months ended September 30, 2024, the Corporation repurchased approximately 356,000 and 455,000 shares of its common stock, respectively. For the three and nine months ended September 30, 2023, the Corporation repurchased approximately 64,000 and 209,000 shares of its common stock, respectively.