Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Accrued employee benefits and compensation	$ 8,678	$ 10,647
Net operating loss carryforwards	4,433	3,785
Tax credit carryforwards	2,823	13,170
Reserves and accruals	4,716	5,145
Operating leases	4,227	4,191
Capitalized research and development	21,305	16,622
Other	10,205	5,299
Total deferred tax assets	56,387	58,859
Less deferred tax asset valuation allowance	(2,843)	(9,775)	$ (9,250)	$ (14,625)
Total deferred tax assets, net of valuation allowance	53,544	49,084
Deferred tax liabilities
Depreciation and amortization	14,368	32,669
Postretirement benefit obligations	687	2,071
Unremitted earnings	2,551	2,335
Operating leases	4,618	4,422
Other	4,228	4,367
Total deferred tax liabilities	26,452	45,864
Net deferred tax asset (liability)	$ 27,092	$ 3,220