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Goodwill (Tables)
6 Months Ended
Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
The following table presents the changes in goodwill on our Consolidated Balance Sheets (in thousands):
 
 
Goodwill as of December 31, 2013
$
221,087

Increase in goodwill related to acquisitions
33,826

Impairments and changes in previous estimates
(1,323
)
Reclassification of assets held-for-sale
(17
)
Goodwill as of June 30, 2014
$
253,573