Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Intangible assets other than goodwill	$ 0	$ 5,208
Pension and other retiree obligations	209	547
Inventory	89	46
Other accruals and reserves	2,370	2,546
Loss and credit carryforwards	10,932	27,682
Other	886	952
Valuation allowance	(13,061)	(27,732)
Deferred tax assets	1,425	9,249
Deferred tax liabilities:
Intangible assets other than goodwill	(21,753)	0
Property, plant and equipment	(2,604)	(790)
Deferred tax liabilities	(24,357)	(790)
Net deferred tax liabilities	$ (22,932)
Net deferred tax assets		$ 8,459