Restructuring and Exit Costs (Narrative) (Details) ft² in Thousands, $ in Thousands	12 Months Ended		13 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2015 ft²
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	$ (26)	$ 2,232
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	100	200
Restructuring liability	500	700
September 2017 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	45	1,275
Reversals of restructuring expense	(157)	(27)
Amount paid in restructuring expenses	705	431
Restructuring liability	0	817		$ 0
September 2017 Plan | Employee Severance Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	45
Reversals of restructuring expense	157
February 2017 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	0	997
Reversals of restructuring expense	0	(142)
Amount paid in restructuring expenses	0	855
Restructuring liability	0	$ 0		$ 0
Consolidation of US Manufacturing Operations | Facility Closing
Restructuring Cost and Reserve [Line Items]
Square feet of manufacturing facility | ft²					60
Restructuring Charges [Member] | September 2017 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	112		$ 1,100
Restructuring Charges [Member] | February 2017 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs	$ 900