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Restructuring Activities (Tables)
 9 Months Ended
Sep. 30, 2017
Restructuring and Related Activities [Abstract]  
Reconciliation of restructuring accrual
The following is a reconciliation of the accrual for the workforce reduction for the three and nine months ending September 30, 2017 and 2016:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Restructuring liability at beginning of period
$
552

 
$
—

 
$
309

 
$
—

      Amounts expensed
—

 
1,108

 
119

 
1,425

      Amounts expensed - discontinued operations
—

 
—

 
396

 
—

      Amounts paid
(309
)
 
(616
)
 
(581
)
 
(933
)
Restructuring liability at end of period
$
243

 
$
492

 
$
243

 
$
492