Employee Benefit Plans And Stock-Based Compensation Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Postemployment Benefits [Abstract]
Service cost	$ 227	$ 243
Interest cost	78	74
Net periodic benefit cost included in operating loss	$ 305	$ 317