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Restructuring Activities (Tables)
 6 Months Ended
Jun. 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 six months ending June 30, 2017 and 2016:
 
Three Months Ended
 
Six Months Ended
 
2017
 
2016
 
2017
 
2016
Restructuring liability at January 1,
$
186

 
$
13

 
$
309

 
$
—

      Amounts expensed
58

 
—

 
119

 
317

      Amounts expensed - discontinued operations
396

 
—

 
396

 
—

      Amounts paid
(88
)
 
(13
)
 
(272
)
 
(317
)
Restructuring liability at June 30,
$
552

 
$
—

 
$
552

 
$
—