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Shareholders' equity (Tables)
 9 Months Ended
Sep. 30, 2018
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
 
Nine Months Ended
 
September 30, 2018
 
October 1, 2017
 
September 30, 2018
 
October 1, 2017
 
(Shares in thousands)
Basic
45,851

 
45,035

 
45,587

 
44,975

Dilutive effect of share-based awards
919

 
934

 
1,007

 
873

Dilutive effect of convertible notes and warrants
45

 
618

 
191

 
825

Diluted
46,815

 
46,587

 
46,785

 
46,673
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 nine months ended September 30, 2018 and October 1, 2017:
 
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 income (loss) before reclassifications
2,816

 
127

 
(30,130
)
 
(27,187
)
Amounts reclassified from accumulated other comprehensive income
(873
)
 
3,984

 
—

 
3,111

Net current-period other comprehensive income (loss)
1,943

 
4,111

 
(30,130
)
 
(24,076
)
Balance as of September 30, 2018
$
2,283

 
$
(134,697
)
 
$
(156,753
)
 
$
(289,167
)
 
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, 2016
$
(2,424
)
 
$
(136,596
)
 
$
(299,697
)
 
$
(438,717
)
Other comprehensive (loss) before reclassifications
3,383

 
(1,050
)
 
156,012

 
158,345

Amounts reclassified from accumulated other comprehensive loss
1,535

 
3,387

 
—

 
4,922

Net current-period other comprehensive income
4,918

 
2,337

 
156,012

 
163,267

Balance as of October 1, 2017
$
2,494

 
$
(134,259
)
 
$
(143,685
)
 
$
(275,450
)
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 nine months ended September 30, 2018 and October 1, 2017:
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2018
 
October 1, 2017
 
September 30, 2018
 
October 1, 2017
 
(Dollars in thousands)
(Gains) losses on foreign exchange contracts:
 
 
 
 
 
 
 
Cost of goods sold
$
(87
)
 
$
(1,179
)
 
$
(1,038
)
 
$
1,769

Total before tax
(87
)
 
(1,179
)
 
(1,038
)
 
1,769

Taxes (benefit)
25

 
237

 
165

 
(234
)
Net of tax
$
(62
)
 
$
(942
)
 
$
(873
)
 
$
1,535

 
 
 
 
 
 
 
 
Amortization of pension and other postretirement benefit items (1):
Actuarial losses
$
1,640

 
$
1,723

 
$
5,120

 
$
5,176

Prior-service costs
24

 
20

 
71

 
79

Total before tax
1,664

 
1,743

 
5,191

 
5,255

Tax benefit
(388
)
 
(619
)
 
(1,207
)
 
(1,868
)
Net of tax
$
1,276

 
$
1,124

 
$
3,984

 
$
3,387

 
 
 
 
 
 
 
 
Total reclassifications, net of tax
$
1,214

 
$
182

 
$
3,111

 
$
4,922

(1) These accumulated other comprehensive (loss) income components are included in the computation of net benefit expense for pension and other postretirement benefit plans (see Note 12 for additional information).