Condensed Consolidated Statements Of Changes In Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2010	$ 42,245	$ 349,156	$ 1,578,913	$ (51,880)	$ (135,058)	$ 3,902	$ 1,787,278
Balance, Shares at Dec. 31, 2010	42,245				2,250
Net income			77,812			382	78,194
Cash dividends ($0.34 per share)			(13,614)				(13,614)
Comprehensive income				32,090		(6)	32,084
Shares issued under compensation plans	155	1,512			3,255		4,922
Shares issued under compensation plans, Shares	155				(54)
Deferred compensation		(39)			163		124
Deferred compensation, Shares					(4)
Balance at Mar. 27, 2011	42,400	350,629	1,643,111	(19,790)	(131,640)	4,278	1,888,988
Balance, Shares at Mar. 27, 2011	42,400				2,192
Balance at Dec. 31, 2011	42,923	380,965	1,847,106	(159,353)	(131,053)	2,195	1,982,783
Balance, Shares at Dec. 31, 2011	42,923				2,183
Net income			(283,735)			227	(283,508)
Cash dividends ($0.34 per share)			(13,866)				(13,866)
Comprehensive income				34,043		78	34,121
Shares issued under compensation plans	33	46			2,131		2,210
Shares issued under compensation plans, Shares	33				(35)
Deferred compensation		(10)			116		106
Deferred compensation, Shares					(4)
Balance at Apr. 01, 2012	$ 42,956	$ 381,001	$ 1,549,505	$ (125,310)	$ (128,806)	$ 2,500	$ 1,721,846
Balance, Shares at Apr. 01, 2012	42,956				2,144