Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Taxes [Line Items]
Estimated annual effective tax rate			11.20%	18.50%
Effective income tax rate continuing operations			1.30%	19.10%
Provision (benefit) for income taxes	$ (577)	$ 460	$ 55	$ 2,376
Research and Development [Member]
Income Taxes [Line Items]
Effective income tax rate continuing operations			11.20%
Provision (benefit) for income taxes			$ 400
Expiration of Fully Vested Stock Options [Member]
Income Taxes [Line Items]
Effective income tax rate continuing operations		19.10%		18.50%