Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (loss) from continuing operations before taxes and noncontrolling interests [Abstract]
Domestic	$ (25,884)	$ (10,992)	$ (39,861)
Foreign	184,212	237,290	456,637
Income before taxes	158,328	226,298	416,776
Current:
Federal	7,327	9,137	18,756
State and local	218	415	209
Foreign	55,399	113,779	263,247
Total current income tax expense	62,944	123,331	282,212
Deferred:
Federal	(6,068)	(13,731)	(58,386)
State and local	(538)	(802)	(3,117)
Foreign	(21,793)	(47,290)	(150,470)
Total deferred income tax expense	(28,399)	(61,823)	(211,973)
Total income tax expense	34,545	61,508	70,239
Deferred tax assets:
Pension and other retiree obligations	53,585	48,434
Inventories	19,539	19,318
Net operating loss carryforwards	124,251	119,420
Tax credit carryforwards	85,651	76,140
Other accruals and reserves	31,347	29,273
Total gross deferred tax assets	314,373	292,585
Less valuation allowance	(206,950)	(194,797)
Deferred tax assets, net	107,423	97,788
Deferred tax liabilities:
Property and equipment	(1,604)	(2,391)
Earnings not permanently reinvested	0	(16,448)
Convertible debentures	(12,777)	(25,219)
Other - net	(6,364)	(6,499)
Total gross deferred tax liabilities	(20,745)	(50,557)
Net deferred tax assets (liabilities)	86,678	47,231
Discrete Tax Items Repatriation	190	9,583	10,047
Total tax expense enactment of TCJA			25,496
Discrete tax items debt extinguishment	1,563	1,601	54,877
Discrete tax item related to tax-basis foreign exchange gain on settlement of intercompany loan		7,554
Tax effects of changes in uncertain tax positions	3,751	2,831
Tax Cuts and Jobs Act of 2017 BEAT Tax	750	2,900	0
Reconciliation of income tax expense at federal statutory rate to actual income tax provision [Abstract]
Tax at statutory rate	33,249	47,523	87,523
State income taxes, net of U.S. federal tax benefit	(252)	(301)	(2,298)
Effect of foreign operations	(9,896)	9,242	5,736
Tax on earnings not permanently reinvested	4,227	6,256	9,304
Unrecognized tax benefits	4,351	5,584	2,669
Senior convertible debenture repurchase	(1,358)	(1,461)	(52,312)
TCJA remeasurement of deferred tax liabilities	0	0	(1,211)
TCJA - transition tax on unremitted foreign earnings	0	0	7,425
Foreign income taxable in the U.S.	4,155	6,090	15,055
Deferred tax rate impact of corporate reorganization	0	(12,121)	0
Other	69	696	(1,652)
Total income tax expense	34,545	61,508	70,239
Net operating loss carryforwards [Abstract]
Discrete tax items included income tax expense	1,998	(799)	$ (39,428)
Corporate tax rate			21.00%
Percentage of dividends received deduction allowed on qualifying dividends paid by foreign subsidiaries			100.00%
TCJA one-time transition tax percentage on deferred foreign earnings for liquid assets			15.50%
TCJA one-time transition tax percentage on deferred foreign earnings for illiquid assets			8.00%
Available tax credit carryforwards [Abstract]
Discrete Tax Items Repatriation	(190)	(9,583)	$ (10,047)
U.S. foreign tax credit carryforward (gross)	68,874
Income tax uncertainties [Abstract]
Cash repatriated during the current period	104,091	188,742	724,000
Repatriation taxes paid	16,258	38,814	156,767
Expected TCJA tax payment, net	184,467	184,467	184,467
Amount of TCJA tax first installment	14,757	14,757	14,757
Net income taxes paid (refunded)	69,706	185,654	248,958
Company accrued interest and penalties related to the unrecognized tax benefits	3,239	3,561
Company recognized interest and penalties.	128	1,201	1,470
Unrecognized tax benefits [Roll Forward]
Balance at beginning of year	36,868	21,241	17,056
Addition based on tax positions related to the current year	663	2,383	4,332
Addition based on tax positions related to prior years	8,358	16,190	2,066
Currency translation adjustments			(984)
Currency translation adjustments	1,361	1,211
Reduction based on tax positions related to prior years	(3,152)	0	0
Reduction for settlements	(3,446)	(3,121)	(1,229)
Reduction for lapses of statute of limitation	0	(1,036)	0
Balance at end of year	40,652	$ 36,868	$ 21,241
Minimum [Member]
Available tax credit carryforwards [Abstract]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	4,506
Maximum [Member]
Available tax credit carryforwards [Abstract]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	9,249
Austria [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	19,490
Belgium [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	172,952
Israel [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	10,706
Italy [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	16,779
Japan [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	$ 8,490
Japan [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2023
Japan [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2030
Netherlands [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	$ 13,216
Netherlands [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2021
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	$ 18,184
The Republic of China (Taiwan) [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2026
The Republic of China (Taiwan) [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2028
California [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	$ 27,893
California [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2021
California [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2040
Pennsylvania [Member]
Net operating loss carryforwards [Abstract]
Net operating loss carryforward	$ 614,410
Pennsylvania [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2021
Pennsylvania [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date NOL carryforward	Dec. 31, 2040
Research Tax Credit [Member] | California [Member]
Net operating loss carryforwards [Abstract]
Tax credit carryforward, amount	$ 16,478
Available tax credit carryforwards [Abstract]
Tax Credit Carryforward	16,478
U.S. Foreign Tax Credit [Member]
Net operating loss carryforwards [Abstract]
Tax credit carryforward, amount	68,874
Available tax credit carryforwards [Abstract]
Tax Credit Carryforward	$ 68,874
U.S. Foreign Tax Credit [Member] | Minimum [Member]
Net operating loss carryforwards [Abstract]
Expiration date tax credit carryforward	Dec. 31, 2028
U.S. Foreign Tax Credit [Member] | Maximum [Member]
Net operating loss carryforwards [Abstract]
Expiration date tax credit carryforward	Dec. 31, 2030