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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2016
Employee Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Expense
  Three months ended     Nine months ended  
  September 30,     September 30,  
  2016      2015     2016     2015  
Service cost $ 722   $ 581   $ 2,164   $ 1,743  
Interest cost on projected benefit obligation   601     583     1,804     1,749  
Expected return on plan assets (1,150 )   (1,205 )   (3,450 )   (3,615 )
Amortization of prior service credit   (12 )   (12 )   (36 )   (36 )
Amortization of net actuarial losses   238     237     716     708  
Net periodic pension expense $ 399   $ 184   $ 1,198   $ 549