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, 2018	Dec. 31, 2017
Postemployment Benefits [Abstract]
Service cost		$ 243	$ 259
Interest cost		74	71
Amortization of net actuarial loss (gain)	[1]	0	0
Net periodic benefit cost included in operating loss		$ 317	$ 330

[1] The Company uses the allowable 10% corridor approach to determine the amount of actuarial gains or losses subject to amortization in pension cost. Gains or losses are amortized on a straight-line basis over the average future remaining service period of active plan participants.