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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, 2017
Dec. 31, 2016
Postemployment Benefits [Abstract]    
Service cost $ 259 $ 217
Interest cost 71 87
Amortization of net actuarial loss (gain) [1] 0 0
Net periodic benefit cost included in operating loss $ 330 $ 304
[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.