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Goodwill (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure - Goodwill - Additional Information [Abstract]  
Carrying value of goodwill by reporting segment and the activity
The carrying value of goodwill and the activity for the six months ended June 30, 2015 are as follows (in thousands):
Balance, December 31, 2014
$
553,335

Currency translation adjustments
(8,834
)
Balance, June 30, 2015
$
544,501