Income Taxes - Principal Components Of The Company's Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred income tax assets:
Accruals not yet tax deductible	$ 133,349	$ 133,150
Stock compensation	11,616	10,908
Net operating loss and research & development tax credit carryforwards	63,517	60,401
Amortization of research and experimental costs	43,034	0
Other	55,800	66,245
Deferred tax assets gross	307,316	270,704
Valuation allowance	(40,878)	(33,596)
Deferred tax assets net	266,438	237,108
Deferred income tax liabilities:
Depreciation, tax in excess of book	(49,889)	(66,301)
Pension and postretirement healthcare plan obligations	(58,843)	(67,741)
Withholding tax	(23,632)	(7,927)
Other	(28,561)	(21,478)
Deferred tax liabilities net	(160,925)	(163,447)
Total	$ 105,513	$ 73,661