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, 2024			$ 49,187	$ 147,940	$ 3,861,073	$ (243,225)	$ (1,365,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		$ 347,230			347,230
Other comprehensive income (loss), net of tax		57,297				57,297
Dividends declared					(25,881)
Restricted stock				(11,296)			11,296
Employee stock purchase plan				8,310			4,228
Share-based compensation				16,536			74
Repurchases of common stock	[1]						(328,112)
Other				(1,070)			1,070
Ending Balance at Sep. 30, 2025			49,187	160,420	4,182,422	(185,928)	(1,676,620)
Beginning Balance at Dec. 31, 2024			49,187	147,940	3,861,073	(243,225)	(1,365,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), net of tax		69,413
Ending Balance at Dec. 31, 2025		2,533,574	49,187	165,014	4,310,680	(173,812)	(1,817,495)
Beginning Balance at Jun. 30, 2025			49,187	149,650	4,066,497	(168,117)	(1,385,497)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		124,832			124,832
Other comprehensive income (loss), net of tax		(17,811)				(17,811)
Dividends declared					(8,907)
Restricted stock				(9)			9
Employee stock purchase plan				4,653			1,904
Share-based compensation				6,126
Repurchases of common stock	[1]						(293,036)
Ending Balance at Sep. 30, 2025			49,187	160,420	4,182,422	(185,928)	(1,676,620)
Beginning Balance at Dec. 31, 2025		2,533,574	49,187	165,014	4,310,680	(173,812)	(1,817,495)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		418,241			418,241
Other comprehensive income (loss), net of tax		(16,768)				(16,768)
Dividends declared					(27,944)
Restricted stock				(14,401)			14,401
Employee stock purchase plan				9,482			3,573
Share-based compensation				24,059			64
Repurchases of common stock	[1]						(384,731)
Other				(1,050)			1,050
Ending Balance at Sep. 30, 2026		2,559,550	49,187	183,104	4,700,977	(190,580)	(2,183,138)
Beginning Balance at Jun. 30, 2026			49,187	168,981	4,571,562	(189,969)	(1,829,901)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		138,887			138,887
Other comprehensive income (loss), net of tax		(611)				(611)
Dividends declared					(9,472)
Restricted stock				(720)			720
Employee stock purchase plan				5,025			1,549
Share-based compensation				9,818
Repurchases of common stock	[1]						(355,506)
Ending Balance at Sep. 30, 2026		$ 2,559,550	$ 49,187	$ 183,104	$ 4,700,977	$ (190,580)	$ (2,183,138)

[1] For the three and nine months ended September 30, 2026, the Corporation repurchased approximately 538,000 and 580,000 shares of its common stock, respectively. For the three and nine months ended September 30, 2025, the Corporation repurchased approximately 582,000 and 684,000 shares of its common stock, respectively.