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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Rollforward
Changes in the carrying value of goodwill were as follows (in thousands):
December 31, 2013
 
Balance, beginning of year
$
166,386

Acquisitions (Note 4)
84,541

Foreign currency adjustments
(73
)
Other adjustments
387

Balance, end of year
$
251,241

 
 
December 31, 2012
 
Balance, beginning of year
$
69,652

Acquisitions (Note 4)
95,131

Foreign currency adjustments
1,603

Balance, end of year
$
166,386