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Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)

Accumulated other comprehensive income (loss) (AOCI), net of tax, is as follows:
Three months ended March 31, 2018
(dollars in thousands)
 
Foreign Currency Translation
 
Derivative Instruments
 
Pension and Other Post-retirement Benefits
 
Accumulated Other
Comprehensive Loss
Balance December 31, 2017
 
$
(16,183
)
 
$
351

 
$
(89,340
)
 
$
(105,172
)
 
 
 
 
 
 
 
 
 
Cumulative-effect adjustment for the adoption of ASU 2017-12
 
—

 
(275
)
 
—

 
(275
)
 
 
 
 
 
 
 
 
 
Amounts recognized into AOCI
 
4,333

 
1,464

 
—

 
5,797

Currency impact
 
—

 
—

 
(484
)
 
(484
)
Amounts reclassified from AOCI
 
—

 
341

(1) 
1,606

(2) 
1,947

Tax effect
 
—

 
(335
)
 
(367
)
 
(702
)
Other comprehensive income, net of tax
 
4,333


1,470


755


6,558

Balance on March 31, 2018
 
$
(11,850
)
 
$
1,546

 
$
(88,585
)
 
$
(98,889
)
 
 
 
 
 
 
 
 
 

Three months ended March 31, 2017
(dollars in thousands)
 
Foreign Currency Translation
 
Derivative Instruments
 
Pension and Other Post-retirement Benefits
 
Accumulated Other
Comprehensive Loss
Balance on December 31, 2016
 
$
(27,828
)
 
$
(515
)
 
$
(96,854
)
 
$
(125,197
)
 
 
 
 
 
 
 
 
 
Amounts recognized into AOCI
 
1,408

 
(266
)
 
—

 
1,142

Currency impact
 
—

 
—

 
(480
)
 
(480
)
Amounts reclassified from AOCI
 
—

 
518

(1) 
1,464

(2) 
1,982

Tax effect
 
—

 
(87
)
 
(528
)
 
(615
)
Other comprehensive income, net of tax
 
1,408


165


456


2,029

Balance on March 31, 2017
 
$
(26,420
)
 
$
(350
)
 
$
(96,398
)
 
$
(123,168
)
 
 
 
 
 
 
 
 
 
___________________________
(1) 
We reclassified natural gas contracts through cost of sales and the interest rate swap through interest expense on the Condensed Consolidated Statements of Operations. See note 8 for additional information.
(2) 
We reclassified the net pension and non-pension post-retirement benefits amortization and settlement charges through other income (expense) on the Condensed Consolidated Statements of Operations. See note 6 for additional information.