Pensions and Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in benefit obligation [Roll forward]
Increase in PBO due to new actuarial tables									$ 24,000
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in other assets	13,176				15,965				13,176	15,965
Included in "Accrued Payroll"	(7,690)				(8,333)				(7,690)	(8,333)
Accrued pension and other postretirement costs	(300,524)				(287,901)				(300,524)	(287,901)
Accumulated other comprehensive loss	174,975				141,500				174,975	141,500
Components of actuarial items [Abstract]
Total actuarial items	174,975				141,500				174,975	141,500
Components of net periodic pension cost [Abstract]
Curtailment and settlement losses (gains)	0	15,588	0	0	0	0	0	0	15,588	0	0
Amounts that will be amortized from accumulated other comprehensive loss into net periodic pension cost during next fiscal year									13,700
Estimated future benefit payments [Abstract]
Estimated future employer contributions to U.S. defined benefit pension plans in next fiscal year, minimum	15,000								15,000
Estimated future employer contributions to U.S. defined benefit pension plans in next fiscal year, maximum	20,000								20,000
Other retirement obligations [Abstract]
Company's matching expense for 401(k) savings plans									5,285	5,276	4,230
Deferred Compensation [Member]
Defined benefit pension plans [Abstract]
Assets held in trust	14,906				14,093				14,906	14,093
Non-qualified Pension Plans [Member]
Defined benefit pension plans [Abstract]
Assets held in trust	21,757				18,678				21,757	18,678
Dr. Felix Zandman [Member] | Non-qualified Pension Plans [Member]
Defined benefit pension plans [Abstract]
Assets held in trust	3,607				4,221				3,607	4,221
Deferred compensation arrangement, annual retirement benefit to surviving spouse	614								614
Equity Securities [Member]
Actual plan asset allocations [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	10.00%								10.00%
Debt Securities [Member]
Actual plan asset allocations [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations	90.00%								90.00%
U.S. Pension Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year				315,373				355,065	315,373	355,065
Service cost									0	0	0
Interest cost									13,821	13,882	15,699
Acquisitions									0	0
Plan amendments and initiations									0	0
Actuarial (gains) losses									50,584	(34,703)
Benefits paid									(18,940)	(18,871)
Curtailments and settlements									(59,363)	0
Currency translation									0	0
Benefit obligation at end of year	301,475				315,373				301,475	315,373	355,065
Number of pension plan participants for whom annuity contracts were purchased									700
Participants who accepted voluntary lump-sum offer									800
Reduction of plan participants									1,500
Percentage of total participants									23.00%
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year				295,633				265,866	295,633	265,866
Actual return on plan assets									38,688	31,018
Acquisitions of plan assets									0	0
Company contributions									17,626	17,620
Benefits paid									(18,940)	(18,871)
Curtailments and settlements									(59,363)	0
Currency translation									0	0
Fair value of plan assets at end of year	273,644				295,633				273,644	295,633	265,866
Funded status at end of year	(27,831)				(19,740)				(27,831)	(19,740)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in other assets	12,964				15,708				12,964	15,708
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(51)				(51)				(51)	(51)
Included in "Accrued Payroll"	(51)				(51)				(51)	(51)
Accrued pension and other postretirement costs	(40,744)				(35,397)				(40,744)	(35,397)
Accumulated other comprehensive loss	88,474				84,384				88,474	84,384
Total	60,643				64,644				60,643	64,644
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)	87,195				83,161				87,195	83,161
Unamortized prior service (credit) cost	1,279				1,223				1,279	1,223
Total actuarial items	88,474				84,384				88,474	84,384
Projected and accumulated benefit obligations [Abstract]
Accumulated benefit obligation, all plans	301,475				315,373				301,475	315,373
Plans for which the accumulated benefit obligation exceeds plan assets [Abstract]
Projected benefit obligation	40,795				35,448				40,795	35,448
Accumulated benefit obligation	40,795				35,448				40,795	35,448
Fair value of plan assets	0				0				0	0
Components of net periodic pension cost [Abstract]
Net service cost									0	0	0
Interest cost									13,821	13,882	15,699
Expected return on plan assets									(14,892)	(19,124)	(18,972)
Amortization of actuarial losses									7,166	14,566	12,960
Amortization of prior service (credit) cost									(56)	978	2,200
Curtailment and settlement losses (gains)									15,588	0	0
Net periodic benefit cost									21,627	10,302	11,887
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)	4.00%				5.00%				4.00%	5.00%
Rate of compensation increase (in hundredths)	0.00%				0.00%				0.00%	0.00%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)									4.85%	4.00%
Rate of compensation increase (in hundredths)									0.00%	0.00%
Expected return on plan assets (in hundredths)									5.29%	7.25%
Estimated future benefit payments [Abstract]
2015	15,691								15,691
2016	16,037								16,037
2017	16,420								16,420
2018	23,084								23,084
2019	18,683								18,683
2020-2024	91,834								91,834
U.S. Pension Plans [Member] | Cash and Cash Equivalents [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	3,006				171				3,006	171
U.S. Pension Plans [Member] | Equity Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	26,601				51,666				26,601	51,666
U.S. Pension Plans [Member] | Debt Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	244,037				241,827				244,037	241,827
Non-U.S. Pension Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year				280,526				282,448	280,526	282,448
Service cost									3,275	3,499	3,247
Interest cost									8,555	8,150	9,374
Acquisitions									465	0
Plan amendments and initiations									0	23
Actuarial (gains) losses									40,021	(5,134)
Benefits paid									(15,888)	(13,980)
Curtailments and settlements									(486)	0
Currency translation									(29,622)	5,520
Benefit obligation at end of year	286,846				280,526				286,846	280,526	282,448
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year				48,859				46,580	48,859	46,580
Actual return on plan assets									1,858	2,482
Acquisitions of plan assets									10	0
Company contributions									17,015	14,781
Benefits paid									(15,888)	(13,980)
Curtailments and settlements									(486)	0
Currency translation									(2,212)	(1,004)
Fair value of plan assets at end of year	49,156				48,859				49,156	48,859	46,580
Funded status at end of year	(237,690)				(231,667)				(237,690)	(231,667)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Included in other assets	212				257				212	257
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(6,624)				(7,644)				(6,624)	(7,644)
Included in "Accrued Payroll"	(6,624)				(7,644)				(6,624)	(7,644)
Accrued pension and other postretirement costs	(231,278)				(224,280)				(231,278)	(224,280)
Accumulated other comprehensive loss	88,076				61,652				88,076	61,652
Total	(149,614)				(170,015)				(149,614)	(170,015)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)	88,076				61,652				88,076	61,652
Unamortized prior service (credit) cost	0				0				0	0
Total actuarial items	88,076				61,652				88,076	61,652
Projected and accumulated benefit obligations [Abstract]
Accumulated benefit obligation, all plans	269,069				260,558				269,069	260,558
Plans for which the accumulated benefit obligation exceeds plan assets [Abstract]
Projected benefit obligation	272,977				251,569				272,977	251,569
Accumulated benefit obligation	261,996				238,419				261,996	238,419
Fair value of plan assets	37,634				21,356				37,634	21,356
Components of net periodic pension cost [Abstract]
Net service cost									3,275	3,499	3,247
Interest cost									8,555	8,150	9,374
Expected return on plan assets									(2,109)	(2,084)	(1,667)
Amortization of actuarial losses									2,700	3,407	1,681
Amortization of prior service (credit) cost									(5)	(12)	60
Curtailment and settlement losses (gains)									1,137	959	0
Net periodic benefit cost									13,553	13,919	12,695
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)	2.15%				3.11%				2.15%	3.11%
Rate of compensation increase (in hundredths)	1.97%				1.99%				1.97%	1.99%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)									3.11%	3.04%
Rate of compensation increase (in hundredths)									1.99%	1.48%
Expected return on plan assets (in hundredths)									3.85%	4.44%
Estimated future benefit payments [Abstract]
2015	14,140								14,140
2016	14,230								14,230
2017	16,247								16,247
2018	14,968								14,968
2019	16,036								16,036
2020-2024	80,418								80,418
Non-U.S. Pension Plans [Member] | Cash and Cash Equivalents [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	21,619				22,831				21,619	22,831
Non-U.S. Pension Plans [Member] | Equity Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	9,268				9,911				9,268	9,911
Non-U.S. Pension Plans [Member] | Debt Securities [Member]
Change in plan assets [Roll forward]
Fair value of plan assets at end of year	18,269				16,117				18,269	16,117
U.S. Postretirement Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year				7,341				8,157	7,341	8,157
Service cost									115	111	106
Interest cost									351	314	366
Plan amendments and initiations									0	0
Actuarial (gains) losses									1,492	(639)
Benefits paid									(622)	(602)
Currency translation									0	0
Benefit obligation at end of year	8,677				7,341				8,677	7,341	8,157
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year				0					0
Benefits paid									(622)	(602)
Fair value of plan assets at end of year	0				0				0	0
Funded status at end of year	(8,677)				(7,341)				(8,677)	(7,341)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(666)				(638)				(666)	(638)
Included in "Accrued Payroll"	(666)				(638)				(666)	(638)
Accrued pension and other postretirement costs	(8,011)				(6,703)				(8,011)	(6,703)
Accumulated other comprehensive loss	(3,325)				(5,782)				(3,325)	(5,782)
Total	(12,002)				(13,123)				(12,002)	(13,123)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)	(668)				(2,301)				(668)	(2,301)
Unamortized prior service (credit) cost	(2,657)				(3,481)				(2,657)	(3,481)
Total actuarial items	(3,325)				(5,782)				(3,325)	(5,782)
Components of net periodic pension cost [Abstract]
Net service cost									115	111	106
Interest cost									351	314	366
Amortization of actuarial losses									(140)	4	(76)
Amortization of prior service (credit) cost									(824)	(798)	(798)
Amortization of transition obligation									0	0	32
Net periodic benefit cost									(498)	(369)	(370)
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)	4.00%				5.00%				4.00%	5.00%
Rate of compensation increase (in hundredths)	0.00%				0.00%				0.00%	0.00%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)									5.00%	4.00%
Rate of compensation increase (in hundredths)									0.00%	0.00%
Estimated future benefit payments [Abstract]
2015	666								666
2016	706								706
2017	722								722
2018	712								712
2019	695								695
2020-2024	3,088								3,088
Other postretirement benefits [Abstract]
Number of unfunded non-pension postretirement plans	2								2
Non-U.S. Postretirement Plans [Member]
Change in benefit obligation [Roll forward]
Benefit obligation at beginning of year				7,504				6,964	7,504	6,964
Service cost									307	299	253
Interest cost									244	257	286
Plan amendments and initiations									0	0
Actuarial (gains) losses									752	398
Benefits paid									(565)	(740)
Currency translation									(959)	326
Benefit obligation at end of year	7,283				7,504				7,283	7,504	6,964
Change in plan assets [Roll forward]
Fair value of plan assets at beginning of year				0					0
Benefits paid									(565)	(740)
Fair value of plan assets at end of year	0				0				0	0
Funded status at end of year	(7,283)				(7,504)				(7,283)	(7,504)
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(349)				0				(349)	0
Included in "Accrued Payroll"	(349)				0				(349)	0
Accrued pension and other postretirement costs	(6,934)				(7,504)				(6,934)	(7,504)
Accumulated other comprehensive loss	1,750				1,246				1,750	1,246
Total	(5,533)				(6,258)				(5,533)	(6,258)
Components of actuarial items [Abstract]
Unrecognized net actuarial loss (gain)	1,750				1,246				1,750	1,246
Unamortized prior service (credit) cost	0				0				0	0
Total actuarial items	1,750				1,246				1,750	1,246
Components of net periodic pension cost [Abstract]
Net service cost									307	299	253
Interest cost									244	257	286
Amortization of actuarial losses									38	8	0
Amortization of prior service (credit) cost									0	0	0
Amortization of transition obligation									0	0	0
Net periodic benefit cost									589	564	539
Weighted average assumptions used to calculate benefit obligations [Abstract]
Discount rate (in hundredths)	2.25%				3.44%				2.25%	3.44%
Rate of compensation increase (in hundredths)	2.87%				3.19%				2.87%	3.19%
Weighted average assumptions used calculating net periodic benefit cost [Abstract]
Discount rate (in hundredths)									3.44%	3.80%
Rate of compensation increase (in hundredths)									3.19%	3.20%
Estimated future benefit payments [Abstract]
2015	349								349
2016	235								235
2017	348								348
2018	356								356
2019	544								544
2020-2024	3,136								3,136
Other postretirement benefits [Abstract]
Number of European subsidiaries with unfunded non-pension postretirement plans	2								2
Other Retirement Obligations [Member]
Amounts recognized in balance sheet associated with retirement benefit plans [Abstract]
Accrued pension and other postretirement costs	$ (13,557)				$ (14,017)				$ (13,557)	$ (14,017)