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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Accumulated Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss) (AOCI), net of tax, is as follows:
(dollars in thousands)
 
Foreign Currency Translation
 
Derivative Instruments
 
Pension and Other Post-retirement Benefits
 
Total
Accumulated
Comprehensive Loss
Balance on December 31, 2014
 
$
(9,162
)
 
$
(625
)
 
$
(128,660
)
 
$
(138,447
)
 
 
 
 
 
 
 
 
 
Amounts recognized into AOCI
 
(13,751
)
 
(4,287
)
 
4,204

 
(13,834
)
Currency impact
 
—

 
—

 
4,233

 
4,233

Amounts reclassified from AOCI
 
—

 
2,357

(1 
) 
31,312

(2) 
33,669

Tax effect
 
—

 
695

 
(6,548
)
 
(5,853
)
Other comprehensive income (loss), net of tax
 
(13,751
)
 
(1,235
)
 
33,201

 
18,215

Balance on December 31, 2015
 
(22,913
)
 
(1,860
)
 
(95,459
)
 
(120,232
)
 
 
 
 
 
 
 
 
 
Amounts recognized into AOCI
 
(6,244
)
 
(1,335
)
 
(10,728
)
 
(18,307
)
Currency impact
 
—

 
—

 
1,271

 
1,271

   Amounts reclassified from AOCI
 
—

 
3,528

(1 
) 
5,452

(2) 
8,980

Tax effect
 
1,329

 
(848
)
 
2,610

 
3,091

Other comprehensive income (loss), net of tax
 
(4,915
)
 
1,345

 
(1,395
)
 
(4,965
)
Balance on December 31, 2016
 
(27,828
)
 
(515
)
 
(96,854
)
 
(125,197
)
 
 
 
 
 
 
 
 
 
Amounts recognized into AOCI
 
12,835

 
(286
)
 
6,307

 
18,856

Currency impact
 
—

 
—

 
(152
)
 
(152
)
   Amounts reclassified from AOCI
 
—

 
1,780

(1 
) 
5,586

(2) 
7,366

Tax effect
 
(1,190
)
 
(628
)
 
(4,227
)
 
(6,045
)
Other comprehensive income (loss), net of tax
 
11,645

 
866

 
7,514

 
20,025

Balance on December 31, 2017
 
$
(16,183
)
 
$
351

 
$
(89,340
)
 
$
(105,172
)

_________________________
(1) 
We reclassified natural gas contracts through cost of sales and the interest rate swap through interest expense on the Consolidated Statements of Operations. See note 12 for additional information.
(2) 
We reclassified the net pension and non-pension post-retirement benefits amortization and settlement charges through cost of sales and selling, general and administrative expenses on the Consolidated Statements of Operations. See notes 8 and 9 for additional information.