Income Taxes Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carry-forwards	$ 13,097	$ 10,622
Tax credit carry-forwards	4,653	4,658
Accruals for compensation	7,517	7,440
Accruals for inventory capitalization	992	3,192
Unrealized benefit from corporate restructuring	44,888	49,313
Intangibles	1,026	582
Unrealized benefit plan loss	2,070	1,974
Unrealized foreign exchange	2,881	2,853
UK tax rate change	318	905
Unearned revenue	882	1,024
Interest carry-forward	7,700	2,677
Other	322	1,183
Total deferred tax assets	86,346	86,423
Valuation allowance	(9,318)	(7,377)
Net deferred tax assets	77,028	79,046
Deferred tax liabilities:
Property, plant and equipment	(3,246)	(4,139)
Accrued withholding taxes	(26,489)	(27,544)
Unrealized foreign exchange	(1,415)	(1,070)
Other	(185)	(167)
Total deferred tax liabilities	(31,335)	(32,920)
Net deferred income taxes	45,693	46,126
Long-term deferred tax assets, net	68,570	70,462
Long-term deferred tax liabilities, net	(22,877)	(24,336)
Net deferred income taxes	$ 45,693	$ 46,126