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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2012
Employee Benefit Plans [Abstract]  
Employee Benefit Plans

10. Employee Benefit Plans

The components of net periodic benefit costs for the three and nine months ended September 30, 2012 and 2011 were as follows (dollars in thousands):

 Three months ended September 30, Nine months ended September 30, 
 2012 2011 2012 2011 
Net periodic pension benefit cost:            
Service cost$ 1,910 $ 1,312 $ 5,638 $ 4,324 
Interest cost  1,065   971   3,135   2,913 
Expected return on plan assets  (766)   (734)   (2,299)   (2,203) 
Amortization of prior service cost  102   195   288   296 
Amortization of prior actuarial loss  851   658   2,514   1,160 
Total$ 3,162 $ 2,402 $ 9,276 $ 6,490 
             
Net periodic other benefits cost:            
Service cost$ 673 $ 413 $ 1,231 $ 837 
Interest cost  418   335   935   776 
Expected return on plan assets  --   --   --   -- 
Amortization of prior service cost  --   --   --   -- 
Amortization of prior actuarial loss  380   147   557   265 
Total$ 1,471 $ 895 $ 2,723 $ 1,878 

The Company has made pension contributions of $4.0 million during the first nine months of 2012 and expects to make total pension contributions of $6.2 million in 2012.