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Supplemental Disclosures Of Cash Flow Information (Tables)
12 Months Ended
Dec. 31, 2011
Supplemental Disclosures Of Cash Flow Information [Abstract]  
Summary Of Noncash Transactions
     Year Ended December 31,  
     2011      2010      2009  

Stock-based compensation not involving cash

   $ 14,954       $ 11,848       $ 9,860   

Commitments for low-income housing interests

     36,722         137,817         50,789   

Capitalized investment income

     5,321         6,517         7,345   
Summary Of Amounts Paid
     Year Ended December 31,  
     2011      2010      2009  

Interest paid

   $ 75,653       $ 76,911       $ 71,288   

Income taxes paid

     188,510         195,172         87,376