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Goodwill (Tables)
12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Value of Goodwill
 
As of December 31,
 
2012
 
2011
 
(in thousands)
Balance, January 1
$
161,664

 
$
162,507

Foreign currency translation adjustments
3,226

 
(843
)
Total goodwill
$
164,890

 
$
161,664