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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2013 and 2014 (in thousands): 
 
December 31, 2013
 
December 31, 2014
Goodwill at the beginning of year
$
218,442

 
$
221,087

Increase in goodwill related to acquisitions
3,843

 
37,653

Changes in previous estimates
—

 
(101
)
Net impairment and write-off related to divestitures
(1,198
)
 
(1,197
)
Goodwill at the end of the year
$
221,087

 
$
257,442