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Restructuring Activities (Tables)
12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Reconciliation of Accrual for Workforce Reduction
The following is a reconciliation of the accrual for the workforce reduction that is included within the "Accrued Liabilities" line of the consolidated balance sheets twelve-months ending December 31, 2018.
 
Twelve Months Ended
 
2018
2017
2016
Restructuring liability at January 1,
$
391

$
309

$

      Amounts expensed

119

1,428

      Amounts expensed - discontinued operations

581


      Amounts paid
(326
)
(618
)
(1,119
)
Restructuring liability at December 31,
$
65

$
391

$
309