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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2016
Restructuring and Related Activities [Abstract]  
Restructuring Activities
The following table sets forth details regarding the activities described above during the year ended December 31, 2016:

 
Balance as of January 1, 2016
 
Expenses,
Net
 
Cash
 
Noncash
 
Balance as of December 31, 2016
 
(in thousands)
Employee severance and other personnel benefits:
 
 
 
 
 
 
 
 
 
2016 Workforce reduction
$
—

 
$
17,162

 
$
(14,697
)
 
$
(611
)
 
$
1,854

Total
$
—

 
$
17,162

 
$
(14,697
)
 
$
(611
)
 
$
1,854