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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2012
Commitments and Contingencies [Abstract]  
Summary of total maximum amount of financial guarantees issued

                                         
    Maximum Amount  
    Remainder
of
2012		     2013     2014     Thereafter     Total  
    (In thousands)  

Financial standby letters of credit and other financial surety instruments

   $ 92,618     $ 20,287     $ —     $ —     $ 112,905