Employee Benefit Plans (Components of Net Periodic Benefit Cost (Credit)) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Defined Benefit Pension Benefits [Member]
Components of net periodic benefit cost (credit)
Service cost	$ 1,034,000	$ 916,000	$ 2,064,000	$ 1,841,000
Interest cost	5,931,000	5,298,000	11,847,000	10,613,000
Expected return on plan assets	(6,280,000)	(6,253,000)	(12,543,000)	(12,517,000)
Amortization of prior service	(71,000)	(67,000)	(142,000)	(134,000)
Net periodic benefit cost (credit)	614,000	(106,000)	1,226,000	(197,000)
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer			1,900,000
Postretirement Medical Benefits [Member]
Components of net periodic benefit cost (credit)
Service cost	24,000	28,000	48,000	56,000
Interest cost	39,000	36,000	77,000	72,000
Expected return on plan assets	(241,000)	(241,000)	(482,000)	(482,000)
Amortization of prior service	0	0	0	0
Net periodic benefit cost (credit)	$ (178,000)	$ (177,000)	$ (357,000)	$ (354,000)