Severance and Other Termination Benefits (Narrative) (Details) - One-time Termination Benefits [Member] - Impact of COVID -19 [Member] $ in Thousands			1 Months Ended	3 Months Ended	6 Months Ended
	May 04, 2020 employee	Apr. 01, 2020 employee	Jul. 31, 2020 employee	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of workforce reduced	50	80
One-time cash severance costs | $				$ 3,500	$ 4,800
Subsequent Events [Member]
Restructuring Cost and Reserve [Line Items]
Number of workforce reduced			50