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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2015
Employee Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Expense
  Three months ended
  March 31,
  2015   2014  
Service cost $ 581   $ 479  
Interest cost on projected benefit obligation   583     574  
Expected return on plan assets (1,205 )   (1,029 )
Amortization of prior service credit   (12 )   (12 )
Amortization of net actuarial losses   236     44  
Net periodic pension expense $ 183   $ 56