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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2016
Employee Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Expense
  Three months ended
  March 31,
  2016      2015  
Service cost $ 721   $ 581  
Interest cost on projected benefit obligation   601     583  
Expected return on plan assets (1,150 )   (1,205 )
Amortization of prior service credit   (12 )   (12 )
Amortization of net actuarial losses   239     236  
Net periodic benefit expense $ 399   $ 183