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		$ 137,845			137,845
Other Comprehensive Income (Loss), Net of Tax		33,541				33,541
Dividends paid					(14,960)
Restricted stock				(13,878)			13,878
Employee stock purchase plan				1,483			3,742
Share-based compensation				8,949			(90)
Repurchases of common stock	[1]						(24,365)
Other				(261)			261
Ending Balance at Jun. 30, 2023			49,187	130,846	3,286,376	(225,375)	(1,113,675)
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 (Loss), 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 Mar. 31, 2023			49,187	126,909	3,213,039	(244,442)	(1,101,439)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		80,999			80,999
Other Comprehensive Income (Loss), Net of Tax		19,067				19,067
Dividends paid					(7,662)
Restricted stock				(73)			73
Share-based compensation				4,010			(330)
Repurchases of common stock	[1]						(11,979)
Ending Balance at Jun. 30, 2023			49,187	130,846	3,286,376	(225,375)	(1,113,675)
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		175,966			175,966
Other Comprehensive Income (Loss), Net of Tax		(20,265)				(20,265)
Dividends paid					(15,712)
Restricted stock				(13,879)			13,879
Employee stock purchase plan				2,484			2,988
Share-based compensation				9,251			215
Repurchases of common stock							(24,796)
Other				(2,464)			2,340
Ending Balance at Jun. 30, 2024		2,458,420	49,187	135,574	3,648,005	(233,488)	(1,140,858)
Beginning Balance at Mar. 31, 2024			49,187	133,166	3,556,572	(228,255)	(1,130,491)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		99,471			99,471
Other Comprehensive Income (Loss), Net of Tax		(5,233)				(5,233)
Dividends paid					(8,038)
Restricted stock				0			0
Share-based compensation				4,689			82
Repurchases of common stock							(12,606)
Other				(2,281)			2,157
Ending Balance at Jun. 30, 2024		$ 2,458,420	$ 49,187	$ 135,574	$ 3,648,005	$ (233,488)	$ (1,140,858)

[1] For the three and six months ended June 30, 2024, the Corporation repurchased approximately 47,000 and 100,000 shares of its common stock, respectively. For the three and six months ended June 30, 2023, the Corporation repurchased approximately 73,000 and 146,000 shares of its common stock, respectively.