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Retirement Agreements And Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2013
Retirement Agreements And Other Postretirement Benefits [Abstract]  
Components Of Net Periodic Benefits Cost
    For the Three
    Months Ended
    March 31,
    2013     2012
 
Service cost – benefits earned during the year $ 3,946   $ 3,154
Interest cost on the projected benefit obligation   7,103     6,967
(Accretion) amortization of unrecognized prior service cost   (380 )   2,349
Amortization of unrecognized losses   1,573     170
Net periodic benefits costs $ 12,242   $ 12,640