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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Employee Benefit Plans [Abstract]  
Schedule Of Defined Benefit Plans Disclosures Text Block
 Pension Benefits Other Benefits 
 Three months ended March 31, Three months ended March 31, 
 2013 2012 2013 2012 
Net periodic benefit cost:            
Service cost$ 1,883 $ 1,532 $ 410 $ 279 
Interest Cost  1,018   980   312   259 
Expected return on plan assets  (767)   (734)   --   -- 
Amortization of prior service cost  94   99   --   -- 
Amortization of prior actuarial loss  837   275   186   88 
Total$ 3,065 $ 2,152 $ 908 $ 626