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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2014
Employee Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Expense
  Three months ended Six months ended
  June 30, June 30,
  2014    2013      2014     2013  
Service cost $ 480   $ 516   $ 959   $ 1,032  
Interest cost on projected benefit obligation   573     505     1,147     1,010  
Expected return on plan assets (1,030 )   (921 )   (2,059 )   (1,842 )
Amortization of prior service credit   (12 )   (12 )   (24 )   (24 )
Amortization of net actuarial losses   44     341     88     682  
Net periodic pension expense $ 55   $ 429   $ 111   $