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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2012 and 2013 (in thousands): 
 
December 31, 2012
 
December 31, 2013
Goodwill at beginning of year
$
193,962

 
$
218,442

Increase in goodwill related to acquisitions
25,683

 
3,843

Impairments and changes in previous estimates
(1,118
)
 
(101
)
Reclassification of assets held for sale
(85
)
 
—

Decrease in goodwill due to divestitures
—

 
(1,097
)
Goodwill at the end of the year
218,442

 
221,087