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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2017
Employee Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Expense
  Three months ended
  March 31,
  2017      2016  
Service cost $ 785   $ 721  
Interest cost on projected benefit obligation   613     601  
Expected return on plan assets (1,194 )   (1,150 )
Amortization of unrecognized prior service credit   (13 )   (12 )
Amortization of unrecognized net actuarial loss   292     239  
Net periodic benefit expense $ 483   $ 399