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Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income [Abstract]  
Accumulated Other Comprehensive Income
14.
Accumulated Other Comprehensive Income

Changes in Accumulated Other Comprehensive Income by Component (in thousands)

 
 
Foreign
Currency
Translation
Adjustments
  
Unrecognized
Postretirement
Benefit Costs
(Credit)
  
Total
 
Balance at December 31, 2016
 
$
(11,252
)
 
$
224
  
$
(11,028
)
Other comprehensive income before reclassifications
  
7,027
   
289
   
7,316
 
Amounts reclassified from accumulated other comprehensive income
  
—
   
(397
)
  
(397
)
Other comprehensive income, net
  
7,027
   
(108
)
  
6,919
 
Balance at December 31, 2017
 
$
(4,225
)
 
$
116
  
$
(4,109
)
Other comprehensive income before reclassifications
  
(5,473
)
  
149
   
(5,324
)
Amounts reclassified from accumulated other comprehensive income
  
—
   
(161
)
  
(161
)
Other comprehensive income, net
  
(5,473
)
  
(12
)
  
(5,485
)
Balance at December 31, 2018
 
$
(9,698
)
 
$
104
  
$
(9,594
)

Reclassifications Out of Accumulated Other Comprehensive Income and into the Consolidated Statements of Operations (in thousands)

  
Year Ended December 31,
 
Details About Accumulated Other Comprehensive Income Components
 
2018
  
2017
 
Amortization of postretirement benefit plans:
   
Prior service benefit (1)
 
$
—
  
$
—
 
Unrecognized (gain) loss (1)
  
(268
)
  
(661
)
Total before income tax
  
(268
)
  
(661
)
Income tax expense
  
107
   
264
 
Total reclassifications for the period
 
$
(161
)
 
$
(397
)


(1)
These accumulated other comprehensive income components are included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income (expense), net in our consolidated statements of operations (see Note 17 for additional information).