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Goodwill (Tables)
9 Months Ended
Sep. 30, 2014
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, 2014 (in thousands):
 
 
Goodwill as of December 31, 2013
$
221,087

Increase in goodwill related to acquisitions
33,826

Changes in previous estimates
3,788

Net impairment and write-off related to divestitures
(1,197
)
Goodwill as of September 30, 2014
$
257,504