Pension and Postretirement Plans (Total Benefit/Cost) (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended							9 Months Ended		12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Sep. 30, 2012	Oct. 02, 2011	Dec. 31, 2011	Jan. 02, 2011
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Cost (Benefit)								$ 9,980	$ (3,236)
Early retirement program expense								8,508	430
Total Cost (Benefit)	12,826	2,424	3,195	1,110	(1,505)	(1,474)	124	18,445	(2,855)	(1,745)	16,427
Amortization of prior service credit (cost)	469				465			1,390	1,397
Total recognized in other comprehensive income (before tax effects)	2,123				6,109			5,449	309
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	10,876				6,760			28,684	20,734
Interest cost	14,828				14,964			44,248	45,033
Expected return on assets	(23,779)				(24,095)			(72,301)	(71,648)
Amortization of prior service cost (credit)	919				882			2,775	2,645
Recognized actuarial loss (gain)	2,502				0			6,574	0
Net Periodic Cost (Benefit)	5,346				(1,489)			9,980	(3,236)
Early retirement program expense	7,486				0			8,508	430
Total Cost (Benefit)	12,832				(1,489)			18,488	(2,806)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	367				380			1,100	1,140
Interest cost	1,060				1,084			3,181	3,252
Amortization of prior service cost (credit)	14				65			41	195
Recognized actuarial loss (gain)	458				353			1,375	1,059
Total Cost (Benefit)	1,899				1,882			5,697	5,646
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	778				718			2,335	2,154
Interest cost	684				766			2,052	2,297
Amortization of prior service cost (credit)	(1,402)				(1,412)			(4,206)	(4,237)
Recognized actuarial loss (gain)	(370)				(481)			(1,110)	(1,441)
Total Cost (Benefit)	$ (310)				$ (409)			$ (929)	$ (1,227)