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Goodwill (Tables)
9 Months Ended
Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of the changes in goodwill
The following summarizes the changes in goodwill during the nine months ended September 30, 2012 (in thousands):
Gross carrying amount, December 31, 2011
 
$
46,515

Adjustments
 
—

Balance as of September 30, 2012
 
$
46,515