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Restructuring Activities (Tables)
 6 Months Ended
Jun. 30, 2017
Restructuring and Related Activities [Abstract]  
Reconciliation of severance-related accrual activity
The following is a reconciliation of the severance-related accrual activity for the six months ended June 30, 2017:
 
Accrued Severance and Other Employee Costs
Beginning Balance
$
—

Accrued restructuring expenses
10,006

Payments
(8,039
)
Ending Balance
$
1,967