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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2011
Commitments and Contingencies Disclosure [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
  $ 49,783     $ 60,201     $     $     $ 109,984