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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2016
Restructuring and Related Activities [Abstract]  
Restructuring
 
 
Balance as of
January 1,
2016
 
Expenses,
net
 
Cash Payments
 
Balance as of
December 31, 2016
2016 workforce reduction
 
$
—

 
$
2,484

 
$
(2,462
)
 
$
22