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Retirement Agreements And Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2012
Retirement Agreements And Other Postretirement Benefits [Abstract]  
Components Of Net Periodic Benefits Cost
    For the Three     For the Nine  
    Months Ended     Months Ended  
    September 30,     September 30,  
    2012     2011     2012   2011  
Service cost – benefits earned during the year $ 3,155 $   1,778   $ 9,463 $ 14,627  
Interest cost on the projected benefit obligation   6,966     3,077     20,900   18,455  
Amortization of unrecognized prior service cost   2,349     (415 )   7,047   9,779  
Amortization of unrecognized losses (gains)   171     (1,525 )   511   (239 )
Net periodic benefits costs $ 12,641   $ 2,915   $ 37,921 $ 42,622