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Goodwill (Tables)
12 Months Ended
Dec. 31, 2015
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, 2014 and 2015 (in thousands): 
 
December 31, 2014
 
December 31, 2015
Goodwill at the beginning of year
$
221,087

 
$
257,442

Increase in goodwill related to acquisitions
37,653

 
6,974

Changes in previous estimates
(101
)
 

Net impairment and write-off related to divestitures
(1,197
)
 

Goodwill at the end of the year
$
257,442

 
$
264,416