Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Pension and other retiree obligations	$ 91	$ 32
Inventory	438	507
Other accruals and reserves	4,580	2,856
Loss and credit carryforwards	24,348	14,535
Interest expense deduction limitation carryforward	7,767	2,769
Other	(462)	0
Valuation allowance	(17,102)	(16,367)
Deferred tax assets	19,660	4,332
Deferred tax liabilities:
Intangible assets other than goodwill	(23,953)	(22,443)
Property, plant and equipment	(1,964)	(2,582)
Unrealized foreign currency gains	0	(2,155)
Other	0	(52)
Deferred tax liabilities	(25,917)	(27,232)
Net deferred tax liabilities	$ (6,257)	$ (22,900)