Restructuring and Exit Costs (Schedule of Restructuring and Exit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Costs incurred	$ (26)	$ 2,232
Lease Obligation Costs
Restructuring Reserve [Roll Forward]
Restructuring liability	700
Costs incurred	100	200
Restructuring liability	$ 500	$ 700