Goodwill and Intangible Assets (Summary of Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 51,579	$ 50,906
Accumulated Amortization	(40,470)	(39,094)
Net Carrying Amount	11,109	11,812
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	30,413	30,413
Accumulated Amortization	(25,973)	(25,187)
Net Carrying Amount	$ 4,440	$ 5,226
Weighted Average Amortization Period	5 years 3 months 18 days	5 years 3 months 18 days
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,964	$ 16,964
Accumulated Amortization	(13,461)	(12,958)
Net Carrying Amount	$ 3,503	$ 4,006
Weighted Average Amortization Period	8 years 4 months 24 days	8 years 4 months 24 days
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,888	$ 3,267
Accumulated Amortization	(800)	(714)
Net Carrying Amount	$ 3,088	$ 2,553
Weighted Average Amortization Period	12 years 10 months 24 days	12 years 9 months 18 days
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 314	$ 262
Accumulated Amortization	(236)	(235)
Net Carrying Amount	$ 78	$ 27
Weighted Average Amortization Period	2 years 2 months 12 days	2 years 8 months 12 days