Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
TCJA income tax expense Abstract [Abstract]
TCJA remeasurement of deferred tax liabilities										$ (74,816)	$ 0	$ 0
TCJA tax on unremitted foreign earnings										215,558	0	0
TCJA foreign taxes on assumed repatriation										213,000
TCJA reversal of deferred taxes due to cancellation of repatriation plan										(118,887)
Total tax expense enactment of TCJA	$ 234,855	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0		234,855
Income (loss) from continuing operations before taxes and noncontrolling interests [Abstract]
Domestic										(40,171)	(135,953)	(40,929)
Foreign										319,535	230,169	115,669
Income before taxes										279,364	94,216	74,740
Current income tax expense:
Federal										180,873	358	290
State and local										108	5	163
Foreign										65,566	46,999	63,573
Total current income tax expense										246,547	47,362	64,026
Deferred income tax expense:
Federal										(101,896)	6,163	78,933
State and local										1,538	(3,039)	311
Foreign										152,735	(5,643)	39,203
Total deferred income tax expense										52,377	(2,519)	118,447
Total income tax expense										298,924	44,843	182,473
Deferred tax assets:
Pension and other retiree obligations	43,536				47,104					43,536	47,104
Inventories	9,658				7,691					9,658	7,691
Property and equipment	3,798				(1,025)					3,798	(1,025)
Net operating loss carryforwards	136,599				183,562					136,599	183,562
Tax credit carryforwards	13,328				25,432					13,328	25,432
Other accruals and reserves	22,930				29,401					22,930	29,401
Total gross deferred tax assets	229,849				292,165					229,849	292,165
Less valuation allowance	(149,070)				(165,269)					(149,070)	(165,269)
Deferred tax assets, net	80,779				126,896					80,779	126,896
Deferred tax liabilities:
Earnings not permanently reinvested	(213,000)				(139,165)					(213,000)	(139,165)
Convertible debentures	(135,576)				(203,641)					(135,576)	(203,641)
Other - net	(6,125)				(10,646)					(6,125)	(10,646)
Total gross deferred tax liabilities	(354,701)				(353,452)					(354,701)	(353,452)
Net deferred tax assets (liabilities)	(273,922)				(226,556)					(273,922)	(226,556)
Discrete Tax Items Repatriation	(2,702)	(892)	(1,240)	(968)	(165)	(1,402)	(1,217)	(769)	$ 163,954	5,802
Tax effects of changes in uncertain tax positions	2,369	(804)	0	0	(8,704)	0	0	0		(1,565)	(8,704)	(2,629)
Reconciliation of income tax expense at federal statutory rate to actual income tax provision [Abstract]
Tax at statutory rate										97,777	32,976	26,159
State income taxes, net of U.S. federal tax benefit										1,070	(1,972)	309
Effect of foreign operations										(54,807)	(26,551)	(13,212)
Tax on earnings not permanently reinvested										88,311	(3,553)	163,699
Unrecognized tax benefits										5,887	(8,453)	(1,353)
Change in valuation allowance on deferred tax asset										0	991	(8,888)
TCJA remeasurement of deferred tax liabilities										(74,816)	0	0
TCJA tax on unremitted foreign earnings										215,558	0	0
Foreign income taxable in the U.S.										20,436	18,442	7,025
Discrete Tax Items - Pension Settlement	0	0	0	0	34,853	0	0	0		0	34,853	0
Tax effect of impairment charges										0	(454)	8,305
Other										(492)	(1,436)	429
Total income tax expense										298,924	44,843	182,473
Net operating loss carryforwards [Abstract]
Discrete Tax Items Included Income Tax Expense										230,618	22,596	152,437
Available tax credit carryforwards [Abstract]
Discrete Tax Items Repatriation	(2,702)	$ (892)	$ (1,240)	(968)	(165)	$ (1,402)	$ (1,217)	(769)	163,954	5,802
Expected repatriation										1,100,000		300,000
Income tax uncertainties [Abstract]
Cash repatriated during the current period										38,000	46,000
Net income taxes paid (refunded)										76,900	58,788	49,301
Company accrued interest and penalties related to the unrecognized tax benefits	2,845				1,638					2,845	1,638
Company recognized interest and penalties.										2,479	542	785
Unrecognized tax benefits [Roll Forward]
Balance at beginning of year				$ 16,805				$ 23,527		16,805	23,527	26,583
Addition based on tax positions related to the current year										3,911	1,553	1,439
Addition based on tax positions related to prior years										1,837	1,047	1,894
Currency translation adjustments										915	(96)	(1,370)
Reduction based on tax positions related to prior years										(1,473)	0	0
Reduction for settlements										(4,077)	(1,210)	(4,879)
Reduction for lapses of statute of limitation										(862)	(8,016)	(140)
Balance at end of year	17,056				$ 16,805				$ 23,527	17,056	$ 16,805	$ 23,527
Minimum [Member]
Available tax credit carryforwards [Abstract]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	2,730									2,730
Maximum [Member]
Available tax credit carryforwards [Abstract]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	5,149									5,149
AUSTRIA [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	16,836									16,836
BELGIUM [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	171,122									171,122
BRAZIL [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	12,622									12,622
Germany [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	6,272									6,272
Israel [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	10,707									10,707
JAPAN [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	5,358									$ 5,358
JAPAN [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2018
JAPAN [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2026
NETHERLANDS [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	19,073									$ 19,073
NETHERLANDS [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2018
NETHERLANDS [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2026
The Republic of China (Taiwan) [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	14,594									$ 14,594
The Republic of China (Taiwan) [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2024
The Republic of China (Taiwan) [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2027
California [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	55,479									$ 55,479
California [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2026
California [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2037
Pennsylvania [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	722,277									$ 722,277
Pennsylvania [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2018
Pennsylvania [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward										Dec. 31, 2037
Research Tax Credit [Member] | California [Member]
Net operating loss carryforwards [Abstract]
Tax Credit Carryforward, Amount	13,327									$ 13,327
Available tax credit carryforwards [Abstract]
Tax Credit Carryforward	$ 13,327									$ 13,327