CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning Balance (in shares) at Dec. 31, 2018			47,248					1,232
Beginning Balance at Dec. 31, 2018	$ 2,539,978	$ (1,321)	$ 47,248	$ 574,761	$ 2,427,599	$ (1,321)	$ (341,085)	$ (168,545)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,897				40,897
Cash dividends	(15,650)				(15,650)
Other comprehensive income (loss)	396						396
Shares issued under compensation plans (in shares)			75					40
Shares issued under compensation plans	5,198		$ 75	3,094				$ 2,029
Deferred compensation (in shares)								(4)
Deferred compensation	380			127				$ 253
Ending Balance (in shares) at Mar. 31, 2019			47,323					1,188
Ending Balance at Mar. 31, 2019	2,569,878		$ 47,323	577,982	2,451,525		(340,689)	$ (166,263)
Beginning Balance (in shares) at Dec. 31, 2018			47,248					1,232
Beginning Balance at Dec. 31, 2018	2,539,978	(1,321)	$ 47,248	574,761	2,427,599	(1,321)	(341,085)	$ (168,545)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	124,272
Other comprehensive income (loss)	15,178
Ending Balance (in shares) at Jun. 30, 2019			47,400					1,186
Ending Balance at Jun. 30, 2019	2,664,844		$ 47,400	590,234	2,519,203		(325,907)	$ (166,086)
Beginning Balance (in shares) at Mar. 31, 2019			47,323					1,188
Beginning Balance at Mar. 31, 2019	2,569,878		$ 47,323	577,982	2,451,525		(340,689)	$ (166,263)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	83,375				83,375
Cash dividends	(15,697)				(15,697)
Other comprehensive income (loss)	14,782						14,782
Shares issued under compensation plans (in shares)			77					2
Shares issued under compensation plans	12,506		$ 77	12,252				$ 177
Ending Balance (in shares) at Jun. 30, 2019			47,400					1,186
Ending Balance at Jun. 30, 2019	2,664,844		$ 47,400	590,234	2,519,203		(325,907)	$ (166,086)
Beginning Balance (in shares) at Dec. 31, 2019			47,536					1,182
Beginning Balance at Dec. 31, 2019	2,979,320	(791)	$ 47,536	616,980	2,824,916	(791)	(344,392)	$ (165,720)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	131,150				131,150
Cash dividends	(15,767)				(15,767)
Other comprehensive income (loss)	(20,327)						(20,327)
Shares issued under compensation plans (in shares)			24					37
Shares issued under compensation plans	(1,302)		$ 24	(3,074)				$ 1,748
Deferred compensation (in shares)								(5)
Deferred compensation	741			383				$ 358
Ending Balance (in shares) at Mar. 29, 2020			47,560					1,140
Ending Balance at Mar. 29, 2020	3,073,024		$ 47,560	614,289	2,939,508		(364,719)	$ (163,614)
Beginning Balance (in shares) at Dec. 31, 2019			47,536					1,182
Beginning Balance at Dec. 31, 2019	2,979,320	$ (791)	$ 47,536	616,980	2,824,916	$ (791)	(344,392)	$ (165,720)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	142,606
Other comprehensive income (loss)	(2,423)
Ending Balance (in shares) at Jun. 28, 2020			47,595					1,136
Ending Balance at Jun. 28, 2020	3,097,402		$ 47,595	624,805	2,935,173		(346,815)	$ (163,356)
Beginning Balance (in shares) at Mar. 29, 2020			47,560					1,140
Beginning Balance at Mar. 29, 2020	3,073,024		$ 47,560	614,289	2,939,508		(364,719)	$ (163,614)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,456				11,456
Cash dividends	(15,791)				(15,791)
Other comprehensive income (loss)	17,904						17,904
Shares issued under compensation plans (in shares)			35					3
Shares issued under compensation plans	10,726		$ 35	10,516				$ 175
Deferred compensation (in shares)								(1)
Deferred compensation	83			0				$ 83
Ending Balance (in shares) at Jun. 28, 2020			47,595					1,136
Ending Balance at Jun. 28, 2020	$ 3,097,402		$ 47,595	$ 624,805	$ 2,935,173		$ (346,815)	$ (163,356)