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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
The activity for each item of accumulated other comprehensive loss is as follows:
 
Foreign
currency items
 
Pension and
postretirement
benefits plans
 
Accumulated other
comprehensive
loss
Beginning balance, January 1, 2016
$
(21,079
)
 
$
(18,575
)
 
$
(39,654
)
Net current period change
(3,234
)
 
(6,347
)
 
(9,581
)
Reclassification adjustments for losses reclassified into income
—

 
390

 
390

Ending balance, December 31, 2016
$
(24,313
)
 
$
(24,532
)
 
$
(48,845
)
Net current period change
7,141

 
814

 
7,955

Reclassification adjustments for losses reclassified into income
—

 
(345
)
 
(345
)
Ending balance, December 31, 2017
$
(17,172
)
 
$
(24,063
)
 
$
(41,235
)

The related tax effects allocated to each component of other comprehensive income (loss) for the years ended December 31, 2017 and 2016 are as follows:
2017
Before Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax Amount
Retirement benefits adjustment:
 
 
 
 
 
Net actuarial gain and prior service credit
$
1,072

 
$
(258
)
 
$
814

Reclassification of actuarial loss and prior service cost to net income
(257
)
 
(88
)
 
(345
)
Net unrealized gain
815

 
(346
)
 
469

Cumulative translation adjustment
7,141

 
—

 
7,141

Total other comprehensive income
$
7,956

 
$
(346
)
 
$
7,610

 
 
 
 
 
 
2016
Before Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax Amount
Retirement benefits adjustment:
 
 
 
 
 
Net actuarial gain and prior service credit
$
(6,553
)
 
$
206

 
$
(6,347
)
Reclassification of actuarial loss and prior service cost to net income
507

 
(117
)
 
390

Net unrealized loss
(6,046
)
 
89

 
(5,957
)
Cumulative translation adjustment
(3,235
)
 
1

 
(3,234
)
Total other comprehensive loss
$
(9,281
)
 
$
90

 
$
(9,191
)