CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands		Total	Common Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Accumulated Other Comprehensive Loss Member	Treasury Stock Member
Beginning Balance at Dec. 31, 2020			$ 49,187	$ 122,535	$ 2,670,328	$ (310,856)	$ (743,620)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		$ 59,469			59,469
Other Comprehensive Income (Loss), Net of Tax		1,640				1,640
Dividends paid/declared					(6,968)
Restricted stock				(6,407)			6,407
Employee Stock Purchase Plan				411			4,508
Share-based compensation				3,230			97
Repurchases of common stock	[1]						(11,797)
Other				(597)			597
Ending Balance at Mar. 31, 2021			49,187	119,172	2,722,829	(309,216)	(743,808)
Beginning Balance at Dec. 31, 2020			49,187	122,535	2,670,328	(310,856)	(743,620)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax		120,391
Ending Balance at Dec. 31, 2021		1,826,490	49,187	127,104	2,908,827	(190,465)	(1,068,163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		40,685			40,685
Other Comprehensive Income (Loss), Net of Tax		(1,059)				(1,059)
Dividends paid/declared					(6,932)
Restricted stock				(8,523)			8,523
Employee Stock Purchase Plan				814			4,470
Share-based compensation				3,714			95
Repurchases of common stock	[1]						(18,857)
Other				(506)			506
Ending Balance at Mar. 31, 2022		$ 1,849,420	$ 49,187	$ 122,603	$ 2,942,580	$ (191,524)	$ (1,073,426)

[1] For both the three months ended March 31, 2022 and 2021, the Corporation repurchased approximately 0.1 million shares of its common stock.