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Restructuring Activities (Tables)
 6 Months Ended
Jun. 30, 2018
Restructuring and Related Activities [Abstract]  
Reconciliation of restructuring accrual
The following is a reconciliation of the accrual for the workforce reduction that is included within the "Accrued Liabilities - Employee Compensation" line of the consolidated balance sheets for the three and six months ending June 30, 2018 and 2017:
 
Three Months Ended
 
Six Months Ended
 
2018
 
2017
 
2018
 
2017
Restructuring liability at beginning of period
$
282

 
$
186

 
$
391

 
$
309

      Amounts expensed
—

 
58

 
—

 
119

      Amounts expensed - discontinued operations
—

 
396

 
—

 
396

      Amounts paid
(94
)
 
(88
)
 
(203
)
 
(272
)
Restructuring liability at end of period
$
188

 
$
552

 
$
188

 
$
552