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Goodwill and Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2012
Goodwill And Intangible Assets [Abstract]  
Estimated annual amortization expense
         
    Amortization
Expense
 
    (In Thousands)  
   

2012

  $ 1,055  

2013

  $ 531  

2014

  $ 378  

2015

  $ 115  

2016

  $ —