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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2015
Employee Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Expense
  Three months ended     Six months ended  
    June 30,       June 30,    
  2015       2014     2015     2014  
Service cost $ 581   $ 480   $ 1,162   $ 959  
Interest cost on projected benefit obligation   583     573     1,166     1,147  
Expected return on plan assets (1,205 )   (1,030 )   (2,410 )   (2,059 )
Amortization of prior service credit   (12 )   (12 )   (24 )   (24 )
Amortization of net actuarial losses   235     44     471     88  
Net periodic pension expense $ 182   $ 55   $ 365   $ 111