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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
The following table presents changes in goodwill in the accompanying Consolidated Balance Sheets for the years ended December 31, 2016 and 2017 (in thousands): 
 
December 31, 2016
 
December 31, 2017
Goodwill at the beginning of year
$
264,416

 
$
275,487

Increase in goodwill related to acquisitions
11,832

 
12,469

Decrease in goodwill related to divestitures
(761
)
 
—

Goodwill at the end of the year
$
275,487

 
$
287,956