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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss) (AOCI), net of tax, is as follows:
Three months ended June 30, 2018
(dollars in thousands)
 
Foreign Currency Translation
 
Derivative Instruments
 
Pension and Other Post-retirement Benefits
 
Accumulated Other
Comprehensive Loss
Balance on March 31, 2018
 
$
(11,850
)
 
$
1,546

 
$
(88,585
)
 
$
(98,889
)
 
 
 
 
 
 
 
 
 
Amounts recognized into AOCI
 
(7,392
)
 
603

 
1,527

 
(5,262
)
Currency impact
 
—

 
—

 
524

 
524

Amounts reclassified from AOCI
 
—

 
(4
)
(1) 
1,564

(2) 
1,560

Tax effect
 
—

 
(127
)
 
(736
)
 
(863
)
Other comprehensive income (loss), net of tax
 
(7,392
)

472


2,879


(4,041
)
Balance on June 30, 2018
 
$
(19,242
)
 
$
2,018

 
$
(85,706
)
 
$
(102,930
)
 
 
 
 
 
 
 
 
 
Six months ended June 30, 2018
(dollars in thousands)
 
Foreign Currency Translation
 
Derivative Instruments
 
Pension and Other Post-retirement Benefits
 
Accumulated Other
Comprehensive Loss
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
 
(3,059
)
 
2,067

 
1,527

 
535

Currency impact
 
—

 
—

 
40

 
40

   Amounts reclassified from AOCI
 
—

 
337

(1) 
3,170

(2) 
3,507

Tax effect
 
—

 
(462
)
 
(1,103
)
 
(1,565
)
Other comprehensive income (loss), net of tax
 
(3,059
)
 
1,942

 
3,634

 
2,517

Balance on June 30, 2018
 
$
(19,242
)
 
$
2,018

 
$
(85,706
)
 
$
(102,930
)

Three months ended June 30, 2017
(dollars in thousands)
 
Foreign Currency Translation
 
Derivative Instruments
 
Pension and Other Post-retirement Benefits
 
Accumulated Other
Comprehensive Loss
Balance on March 31, 2017
 
$
(26,420
)
 
$
(350
)
 
$
(96,398
)
 
$
(123,168
)
 
 
 
 
 
 
 
 
 
Amounts recognized into AOCI
 
5,589

 
(858
)
 
4,801

 
9,532

Currency impact
 
—

 
—

 
(258
)
 
(258
)
Amounts reclassified from AOCI
 
—

 
382

(1) 
1,206

(2) 
1,588

Tax effect
 
—

 
(87
)
 
(2,755
)
 
(2,842
)
Other comprehensive income (loss), net of tax
 
5,589


(563
)

2,994


8,020

Balance on June 30, 2017
 
$
(20,831
)
 
$
(913
)
 
$
(93,404
)
 
$
(115,148
)
 
 
 
 
 
 
 
 
 
Six months ended June 30, 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
 
6,997

 
(1,124
)
 
4,801

 
10,674

Currency impact
 
—

 
—

 
(738
)
 
(738
)
   Amounts reclassified from AOCI
 
—

 
900

(1) 
2,670

(2) 
3,570

Tax effect
 
—

 
(174
)
 
(3,283
)
 
(3,457
)
Other comprehensive income (loss), net of tax
 
6,997

 
(398
)
 
3,450

 
10,049

Balance on June 30, 2017
 
$
(20,831
)
 
$
(913
)
 
$
(93,404
)
 
$
(115,148
)
___________________________
(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.