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Goodwill (Tables)
9 Months Ended
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
The following table presents the changes in goodwill on our Consolidated Balance Sheets during the nine months ended September 30, 2015 (in thousands):
 
 
Goodwill as of December 31, 2014
$
257,442

Increase in goodwill related to acquisitions
3,849

Goodwill as of September 30, 2015
$
261,291