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Employee and Director Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2011
Employee and Director Benefit Plans [Abstract]  
Contributions to plan
                         
    2011     2010     2009  
    (In thousands)  

Contributions to 401(k) savings plan

  $ 9,350     $ 8,775     $ 9,021  
Net recognized gains (losses) of trading securities
                         
    2011     2010     2009  
    (In thousands)  

Trading securities

  $ (472   $ 2,623     $ (1,049
Expense related to defined benefit plans
                         
    2011     2010     2009  
    (In thousands)  

Expense related to defined benefit plans

  $ 2,175     $ 1,832     $ 1,058