Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Minimum
Amounts Recognized in Other Comprehensive Income [Abstract]
Estimated future employer contributions in current fiscal year			$ 6,000
Maximum
Amounts Recognized in Other Comprehensive Income [Abstract]
Estimated future employer contributions in current fiscal year			11,000
U.S. Pension Plans
Net Periodic Benefit Cost [Abstract]
Service cost	$ 113	$ 94	338	$ 282
Interest cost	1,707	1,710	5,122	5,200
Expected return on plan assets	(2,574)	(2,392)	(7,724)	(7,226)
Net amortization: Net actuarial loss	693	693	2,078	2,027
Net periodic pension (benefit) cost	(61)	105	(186)	283
Amounts Recognized in Other Comprehensive Income [Abstract]
Company contributions			4,000
U.S. Retiree Healthcare Plan
Net Periodic Benefit Cost [Abstract]
Service cost	137	116	410	348
Interest cost	155	135	464	405
Expected return on plan assets	(146)	(130)	(440)	(390)
Net periodic pension (benefit) cost	146	121	434	363
Non-U.S. Pension Plans
Net Periodic Benefit Cost [Abstract]
Service cost	1,311	1,253	3,802	3,721
Interest cost	386	423	1,112	1,273
Expected return on plan assets	(434)	(401)	(1,250)	(1,206)
Net amortization: Prior service credit	(47)	(51)	(140)	(145)
Net amortization: Net actuarial loss	248	190	714	570
Net periodic pension (benefit) cost	$ 1,464	$ 1,414	$ 4,238	$ 4,213

The amount of gains or losses recognized in net periodic benefit cost.

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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- Definition

Amount of contributions made by the employer to defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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- Definition

Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
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