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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Loss
The changes in accumulated other comprehensive loss by component, net of tax, during the year ended December 31, 2017 were as follows (in thousands):
 
Pension and Other Postretirement Benefits Items
 
Foreign Currency
Items
 
Total
Balance, December 31, 2016
$
(84,852
)
 
$
(4,781
)
 
$
(89,633
)
Other comprehensive income before reclassifications
17,740

 
—

 
17,740

Amounts reclassified from accumulated other comprehensive loss
(6,517
)
(1) 
—

 
(6,517
)
Net current-period other comprehensive income
11,223

 
—

 
11,223

Balance, December 31, 2017
$
(73,629
)
 
$
(4,781
)
 
$
(78,410
)
 
(1)
The accumulated other comprehensive loss reclassification components are related to amortization of unrecognized actuarial losses and prior service costs, both of which are included in the computation of net periodic pension cost. See Notes 14 and 15.
The changes in accumulated other comprehensive income (loss) by component, net of tax, during the year ended December 31, 2016 were as follows (in thousands):
 
Pension and  Other Postretirement Benefits Items
 
Foreign  Currency
Items
 
Total
Balance, December 31, 2015
$
(83,279
)
 
$
(2,524
)
 
$
(85,803
)
Other comprehensive income (loss) before reclassifications
4,284

 
(2,257
)
 
2,027

Amounts reclassified from accumulated other comprehensive loss
(5,857
)
(1) 
—

 
(5,857
)
Net current-period other comprehensive loss
(1,573
)
 
(2,257
)
 
(3,830
)
Balance, December 31, 2016
$
(84,852
)
 
$
(4,781
)
 
$
(89,633
)

(1)
The accumulated other comprehensive loss reclassification components are related to amortization of unrecognized actuarial losses and prior service costs, both of which are included in the computation of net periodic pension cost. See Notes 14 and 15.