Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

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Restructuring (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended		33 Months Ended
Restructuring (Narrative) (Details) $ in Thousands	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 30		$ 1,200
Number of positions eliminated to date			50		50
Noncurrent portion of accrued liabilities for restructuring due in following year			$ 1,700		$ 1,700
Current portion of accrued liabilities for restructuring			$ 400		$ 400
Curtailment gain	$ 2	$ 5		$ 70
Severance and outplacement costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense				900
AEC assets [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense				170
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense				$ 20