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Goodwill (Tables)
12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the Carrying Value of Goodwill
The changes in the carrying value of goodwill were as follows (in thousands):
 
 
Amount
Balance as of December 31, 2013 and 2014
 
$
77,388

Business acquisition (Note 20)
 
4,060

Balance as of December 31, 2015
 
$
81,448