CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning Balance (in shares) at Dec. 31, 2017		46,871				1,704
Beginning Balance at Dec. 31, 2017	$ 2,430,531	$ 46,871	$ 591,721	$ 2,285,886	$ (265,091)	$ (228,856)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,184			56,184
Cash dividends	(15,447)			(15,447)
Other comprehensive income (loss)	82,690				82,690
Shares issued under compensation plans (in shares)		(97)				(43)
Shares issued under compensation plans	4,122	$ 97	992			$ 3,033
Deferred compensation (in shares)						(8)
Deferred compensation	322					$ 322
Settlements of warrants (in shares)						(132)
Settlements of warrants	(12)		(17,884)			$ 17,872
Ending Balance (in shares) at Apr. 01, 2018		46,968				1,521
Ending Balance at Apr. 01, 2018	2,561,466	$ 46,968	574,829	2,329,699	(182,401)	$ (207,629)
Beginning Balance (in shares) at Dec. 31, 2017		46,871				1,704
Beginning Balance at Dec. 31, 2017	2,430,531	$ 46,871	591,721	2,285,886	(265,091)	$ (228,856)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	110,212
Other comprehensive income (loss)	(24,076)
Ending Balance (in shares) at Sep. 30, 2018		47,192				1,235
Ending Balance at Sep. 30, 2018	2,507,065	$ 47,192	565,319	2,352,648	(289,167)	$ (168,927)
Beginning Balance (in shares) at Apr. 01, 2018		46,968				1,521
Beginning Balance at Apr. 01, 2018	2,561,466	$ 46,968	574,829	2,329,699	(182,401)	$ (207,629)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(2,496)			(2,496)
Cash dividends	(15,491)			(15,491)
Other comprehensive income (loss)	(124,019)				(124,019)
Shares issued under compensation plans (in shares)		(114)				(2)
Shares issued under compensation plans	14,300	$ 114	13,992			$ 194
Deferred compensation	235		235
Settlements of warrants (in shares)						(140)
Settlements of warrants	(14)		(19,019)			$ 19,005
Ending Balance (in shares) at Jul. 01, 2018		47,082				1,379
Ending Balance at Jul. 01, 2018	2,433,981	$ 47,082	570,037	2,311,712	(306,420)	$ (188,430)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,524			56,524
Cash dividends	(15,588)			(15,588)
Other comprehensive income (loss)	17,253				17,253
Shares issued under compensation plans (in shares)		(110)				(2)
Shares issued under compensation plans	14,598	$ 110	14,331			$ 157
Deferred compensation (in shares)						(2)
Deferred compensation	311		163			$ 148
Settlements of warrants (in shares)						(140)
Settlements of warrants	(14)		(19,212)			$ 19,198
Ending Balance (in shares) at Sep. 30, 2018		47,192				1,235
Ending Balance at Sep. 30, 2018	2,507,065	$ 47,192	565,319	2,352,648	(289,167)	$ (168,927)
Beginning Balance (in shares) at Dec. 31, 2018		47,248				1,232
Beginning Balance at Dec. 31, 2018	2,539,978	$ 47,248	574,761	2,427,599	(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	$ 47,248	574,761	2,427,599	(341,085)	$ (168,545)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	353,201
Other comprehensive income (loss)	(23,416)
Ending Balance (in shares) at Sep. 29, 2019		47,463				1,184
Ending Balance at Sep. 29, 2019	2,852,976	$ 47,463	603,634	2,732,408	(364,501)	$ (166,028)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	228,929			228,929
Cash dividends	(15,724)			(15,724)
Other comprehensive income (loss)	(38,594)				(38,594)
Shares issued under compensation plans (in shares)		(63)				(2)
Shares issued under compensation plans	13,521	$ 63	13,400			$ 58
Ending Balance (in shares) at Sep. 29, 2019		47,463				1,184
Ending Balance at Sep. 29, 2019	$ 2,852,976	$ 47,463	$ 603,634	$ 2,732,408	$ (364,501)	$ (166,028)