Acquisition (Details) - USD ($) $ in Thousands	Sep. 25, 2020	Jul. 17, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Operating lease right-of-use assets	$ 62,235		$ 23,413
Goodwill	$ 143,118		$ 79,011
Optics Balzers [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 5,390
Accounts receivable		8,594
Inventories		10,170
Prepaid and other current assets		937
Property, plant, and equipment		46,743
Operating lease right-of-use assets		13,357
Intangible assets		48,600
Goodwill		71,510
Total assets acquired		205,301
Short-term debt		600
Accounts payable		2,851
Salaries and wages		4,392
Other liabilities and accrued items		4,178
Income taxes		61
Unearned revenue		1,259
Operating lease liabilities		12,355
Finance lease liabilities		2,574
Retirement and post-employment benefits		6,586
Unearned income		1,835
Long-term income taxes		181
Deferred income taxes		10,366
Long-term debt		21,958
Total liabilities assumed		69,196
Net assets acquired		$ 136,105