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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2011
Commitments and Contingencies [Abstract] 
Summary of total maximum amount of financial guarantees issued
 
                                         
    Maximum Amount  
    Remainder
                         
    of 2011     2012     2013     Thereafter     Total  
    (In thousands)  
 
Financial standby letters of credit and other financial surety instruments
  $ 35,563     $ 78,009     $     $     $ 113,572