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Shareholders' equity (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Reconciliation of Basic to Diluted Weighted Average Common Shares Outstanding The following table provides a reconciliation of basic to diluted weighted average number of common shares outstanding:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
July 1, 2018
 
June 30, 2019
 
July 1, 2018
 
(Shares in thousands)
Basic
46,172

 
45,581

 
46,111

 
45,455

Dilutive effect of share-based awards
864

 
—

 
878

 
1,052

Dilutive effect of convertible warrants
—

 
—

 
—

 
264

Diluted
47,036

 
45,581

 
46,989

 
46,771
Change in Accumulated Other Comprehensive Income (Loss)
The following tables provide information relating to the changes in accumulated other comprehensive loss, net of tax, for the six months ended June 30, 2019 and July 1, 2018:
 
Cash Flow Hedges
 
Pension and Other Postretirement Benefit Plans
 
Foreign Currency Translation Adjustment
 
Accumulated Other Comprehensive (Loss) Income
 
(Dollars in thousands)
Balance as of December 31, 2018
$
807

 
$
(131,380
)
 
$
(210,512
)
 
$
(341,085
)
Other comprehensive income (loss) before reclassifications
429

 
(13
)
 
12,332

 
12,748

Amounts reclassified from accumulated other comprehensive income
(271
)
 
2,701

 
—

 
2,430

Net current-period other comprehensive income (loss)
158

 
2,688

 
12,332

 
15,178

Balance as of June 30, 2019
$
965

 
$
(128,692
)
 
$
(198,180
)
 
$
(325,907
)
 
Cash Flow Hedges
 
Pension and Other Postretirement Benefit Plans
 
Foreign Currency Translation Adjustment
 
Accumulated Other Comprehensive (Loss) Income
 
(Dollars in thousands)
Balance as of December 31, 2017
$
340

 
$
(138,808
)
 
$
(126,623
)
 
$
(265,091
)
Other comprehensive (loss) before reclassifications
1,103

 
188

 
(44,517
)
 
(43,226
)
Amounts reclassified from accumulated other comprehensive loss
(811
)
 
2,708

 
—

 
1,897

Net current-period other comprehensive income
292

 
2,896

 
(44,517
)
 
(41,329
)
Balance as of July 1, 2018
$
632

 
$
(135,912
)
 
$
(171,140
)
 
$
(306,420
)
Reclassification of Gain/Losses into Income/Expense, Net of Tax
The following table provides information relating to the location in the statements of operations and amount of reclassifications of losses/(gains) in accumulated other comprehensive (loss) income into expense/(income), net of tax, for the three and six months ended June 30, 2019 and July 1, 2018:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2019
 
July 1, 2018
 
June 30, 2019
 
July 1, 2018
 
(Dollars in thousands)
(Gains) losses on foreign exchange contracts:
 
 
 
 
 
 
 
Cost of goods sold
$
(179
)
 
$
(118
)
 
$
(365
)
 
$
(951
)
Total before tax
(179
)
 
(118
)
 
(365
)
 
(951
)
Taxes (benefit)
71

 
27

 
94

 
140

Net of tax
(108
)
 
(91
)
 
(271
)
 
(811
)
Losses (gains) on cross-currency swaps (net investment hedge):
 
 
 
 
 
 
 
Interest expense
(4,917
)
 
$
—

 
(8,799
)
 
$
—

Total before tax
(4,917
)
 
—

 
(8,799
)
 
—

Tax expense
1,111

 
—

 
2,040

 
—

Net of tax
(3,806
)
 
$
—

 
(6,759
)
 
$
—

Amortization of pension and other postretirement benefit items (1):
Actuarial losses
1,738

 
1,734

 
3,478

 
3,480

Prior-service costs
22

 
23

 
44

 
47

Total before tax
1,760

 
1,757

 
3,522

 
3,527

Tax benefit
(410
)
 
(408
)
 
(821
)
 
(819
)
Net of tax
1,350

 
1,349

 
2,701

 
2,708

Total reclassifications, net of tax
$
(2,564
)
 
$
1,258

 
$
(4,329
)
 
$
1,897

(1) These accumulated other comprehensive (loss) income components are included in the computation of net benefit expense for pension and other postretirement benefit plans.