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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2015
Employee Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Expense
  Three months ended     Nine months ended  
  September 30,     September 30,  
  2015       2014     2015     2014  
Service cost $ 581   $ 479   $ 1,743   $ 1,438  
Interest cost on projected benefit obligation   583     573     1,749     1,720  
Expected return on plan assets (1,205 )   (1,029 )   (3,615 )   (3,088 )
Amortization of prior service credit   (12 )   (12 )   (36 )   (36 )
Amortization of net actuarial losses   237     44     708     132  
Net periodic pension expense $ 184   $ 55   $ 549   $ 166