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, 2019		$ 49,187	$ 116,070	$ 2,497,111	$ (325,274)	$ (562,722)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 51,761			51,761
Other Comprehensive Income (Loss), Net of Tax	(45,594)				(45,594)
Dividends paid/declared				(7,095)
Restricted stock			(4,115)			4,115
Employee stock purchase plan and stock options exercised			350			4,716
Share-based compensation			3,123			217
Repurchases of common stock						(112,013)
Other			(517)			517
Ending Balance at Mar. 31, 2020		49,187	114,911	2,541,777	(370,868)	(665,170)
Beginning Balance at Dec. 31, 2019		49,187	116,070	2,497,111	(325,274)	(562,722)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	14,418
Ending Balance at Dec. 31, 2020	1,787,574	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 and stock options exercised			411			4,508
Share-based compensation			3,230			97
Repurchases of common stock						(11,797)
Other			(597)			597
Ending Balance at Mar. 31, 2021	$ 1,838,164	$ 49,187	$ 119,172	$ 2,722,829	$ (309,216)	$ (743,808)