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Benefit Plans
 6 Months Ended
Jun. 30, 2011
Benefit Plans [Abstract]  
Benefit Plans
10. Benefit Plans
          The Corporation sponsors several qualified and nonqualified pension and other postretirement plans for certain of its employees. The net periodic pension cost is based on estimated values provided by an outside actuary. The components of net periodic benefit cost are as follows:
                                 
    Pension Benefits  
    Quarter ended     Six months ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Components of Net Periodic Pension Cost
                               
Service Cost
  $ 1,531     $ 1,480     $ 3,062     $ 2,959  
Interest Cost
    2,860       2,800       5,720       5,600  
Expected return on assets
    (3,328 )     (3,015 )     (6,656 )     (6,029 )
Amortization of unrecognized prior service costs
    98       98       196       197  
Cumulative net loss
    1,780       1,427       3,560       2,854  
 
                       
Net periodic pension cost
  $ 2,941     $ 2,790     $ 5,882     $ 5,581  
 
                       
                                 
    Postretirement Benefits  
    Quarter ended     Six months ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Components of Net Periodic Postretirement Cost
                               
Service Cost
  $ 14     $ 15     $ 28     $ 30  
Interest Cost
    221       240       442       480  
Amortization of unrecognized prior service costs
    —       —       —       —  
Cumulative net loss
    28       4       56       8  
 
                       
Net periodic postretirement cost
  $ 263     $ 259     $ 526     $ 518  
 
                       
          Management anticipates contributing $10.0 million to the qualified pension plan during 2011.
          The Corporation also maintains a savings plan under Section 401(k) of the Internal Revenue Code of 1987, as amended, covering substantially all full-time and part-time employees beginning in the quarter following three months of continuous employment. The savings plan was approved for non-vested employees in the defined benefit pension plan and new hires as of January 1, 2007. Effective January 1, 2009, the Corporation suspended its matching contribution to the savings plan. Effective April 1, 2011, the Corporation reinstated its matching contribution to $.50 for each $1.00 up to 1% of an employee’s qualifying salary. Matching contributions vest in accordance with plan specifications.