Information on Business Segments (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,124,391	$ 1,491,118	$ 1,495,889
Long-lived assets	$ 2,011,800	$ 1,952,700	$ 1,982,400
Sales from international locations to domestic locations	67.00%	68.00%	72.00%
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 483,800	$ 630,000	$ 624,300
Long-lived assets	383,200	372,200	366,100
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	714,000	949,400	958,700
Long-lived assets	1,628,600	1,580,500	1,616,200
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(73,400)	(88,400)	(87,100)
Long-lived assets	0	0	0
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	223,300	302,000	331,400
Long-lived assets	481,500	480,300	494,000
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	129,800	225,700	193,600
Long-lived assets	214,800	226,500	233,300
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 443,100	$ 402,100	$ 412,000