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Goodwill (Tables)
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table presents changes in goodwill in the accompanying Consolidated Balance Sheets for the year ended December 31, 2017 and period ended September 30, 2018 (in thousands): 
 
December 31, 2017
 
September 30, 2018
Goodwill at the beginning of year
$
275,487

 
$
287,956

Increase in goodwill related to acquisitions
12,469

 
16,777

Goodwill at the end of the period
$
287,956

 
$
304,733