CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands, shares in Millions	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	$ 82,779			82,779
Other Comprehensive Income (Loss), Net of Tax	$ (17,407)				(17,407)
Dividends paid				(14,163)
Restricted stock			(4,115)			4,115
Employee stock purchase plan and stock options exercised			106			5,081
Other			(517)			517
Share-based compensation			6,923			217
Repurchases of common stock						(124,613)
Ending Balance at Jun. 30, 2020		49,187	118,467	2,565,727	(342,681)	(677,405)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Shares, Acquired	1.2
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)
Beginning Balance at Mar. 31, 2020		49,187	114,911	2,541,777	(370,868)	(665,170)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	31,018			31,018
Other Comprehensive Income (Loss), Net of Tax	$ 28,187				28,187
Dividends paid				(7,068)
Employee stock purchase plan and stock options exercised			(244)			365
Share-based compensation			3,800			0
Repurchases of common stock						(12,600)
Ending Balance at Jun. 30, 2020		49,187	118,467	2,565,727	(342,681)	(677,405)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Shares, Acquired	0.1
Beginning 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	120,877			120,877
Other Comprehensive Income (Loss), Net of Tax	13,325				13,325
Dividends paid				(14,321)
Restricted stock			(9,007)			9,007
Employee stock purchase plan and stock options exercised			411			4,508
Other			(597)			597
Share-based compensation			6,604			121
Repurchases of common stock						(24,395)
Ending Balance at Jun. 30, 2021	$ 1,894,704	49,187	119,946	2,776,884	(297,531)	(753,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Shares, Acquired	0.2
Beginning Balance at Mar. 31, 2021		49,187	119,172	2,722,829	(309,216)	(743,808)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 61,408			61,408
Other Comprehensive Income (Loss), Net of Tax	11,685				11,685
Dividends paid				(7,353)
Restricted stock			(2,600)			2,600
Share-based compensation			3,374			24
Repurchases of common stock						(12,598)
Ending Balance at Jun. 30, 2021	$ 1,894,704	$ 49,187	$ 119,946	$ 2,776,884	$ (297,531)	$ (753,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Shares, Acquired	0.1