Restructuring and Other Expense - Components of Restructuring and Other Expense (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Severance and related		$ 200	$ 700
Other	[1]		(1,900)
Total restructuring		200	(1,200)
Pension settlement/curtailment			1,100
German levy settlement		(5,000)
Other			(100)
Total other		(5,000)	1,000
Total		$ (4,800)	$ (200)

[1] For the year ended December 31, 2017, other includes $1.5 million net gain from an asset sale and $0.4 million reversal of other employee costs. We have considered these costs to be attributable to our corporate activities and, therefore, they are not part of our discontinued operations.