Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2013

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost include the following:

	Three Months Ended
	March 31, 2013			April 1, 2012
Retirement Plans
Service cost	$	6,135		$	5,742
Interest cost		16,604			17,359
Expected return on plan assets		(21,392	)		(21,117	)
Amortization of net transition obligation		110			116
Amortization of prior service cost		103			85
Amortization of net actuarial loss		10,713			9,149
Net periodic benefit cost	$	12,273		$	11,334
Retiree Health and Life Insurance Plans
Service cost	$	222		$	243
Interest cost		244			345
Expected return on plan assets		(371	)		(372	)
Amortization of prior service credit		(733	)		(1,635	)
Amortization of net actuarial loss		(1	)		202
Net periodic benefit income	$	(639	)	$	(1,217	)