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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Accumulated Other Comprehensive 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, 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
)
 
 
 
 
 
 
 
 
 
Cumulative-effect adjustment for the adoption of ASU 2017-12
 
—

 
(275
)
 
—

 
(275
)
 
 
 
 
 
 
 
 
 
Amounts recognized into AOCI
 
(7,057
)
 
(3,242
)
 
(5,245
)
 
(15,544
)
Currency impact
 
—

 
—

 
(164
)
 
(164
)
  Amounts reclassified from AOCI
 
—

 
(711
)
(1) 
6,431

(2) 
5,720

Tax effect
 
—

 
1,011

 
19

 
1,030

Other comprehensive income (loss), net of tax
 
(7,057
)
 
(2,942
)
 
1,041

 
(8,958
)
Balance on December 31, 2018
 
$
(23,240
)
 
$
(2,866
)
 
$
(88,299
)
 
$
(114,405
)

_________________________
(1) 
We reclassified natural gas contracts through cost of sales and the interest rate swaps 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 other income (expense) on the Consolidated Statements of Operations. See notes 8 and 9 for additional information.