Restructuring (Narrative) (Details) $ in Thousands	6 Months Ended		30 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 80		$ 1,250
Number of positions eliminated to date	50		50
Accrued liabilities for restructuring	$ 230	$ 120
Severance and outplacement costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 860