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Shareholders' equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Weighted Average Number of Shares
The following table provides a reconciliation of basic to diluted weighted average shares outstanding:
 
2018
 
2017
 
2016
 
(Shares in thousands)
Basic
45,689

 
45,004

 
43,325

Dilutive effect of share based awards
970

 
923

 
570

Dilutive effect of convertible notes and warrants
142

 
737

 
3,751

Diluted
46,801

 
46,664

 
47,646
Schedule of Accumulated Other Comprehensive Income (Loss)
The following tables provides information relating to the changes in accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2018 and 2017:
 
Cash Flow
Hedges
 
Pension and
Other
Postretirement
Benefit Plans
 
Foreign
Currency
Translation
Adjustment
 
Accumulated
Other
Comprehensive
Income (Loss)
 
(Dollars in thousands)
Balance at December 31, 2016
$
(2,424
)
 
$
(136,596
)
 
$
(299,697
)
 
$
(438,717
)
Other comprehensive income (loss) before reclassifications
2,775

 
(6,725
)
 
173,074

 
169,124

Amounts reclassified from accumulated other comprehensive income (loss)
(11
)
 
4,513

 
—

 
4,502

Net current-year other comprehensive income (loss)
2,764

 
(2,212
)
 
173,074

 
173,626

Balance at December 31, 2017
340

 
(138,808
)
 
(126,623
)
 
(265,091
)
Other comprehensive income (loss) before reclassifications
2,574

 
1,605

 
(83,889
)
 
(79,710
)
Amounts reclassified from accumulated other comprehensive income
(2,107
)
 
5,823

 
—

 
3,716

Net current-year other comprehensive (loss) income
467

 
7,428

 
(83,889
)
 
(75,994
)
Balance at December 31, 2018
$
807

 
$
(131,380
)
 
$
(210,512
)
 
$
(341,085
)
Reclassification out of Accumulated Other Comprehensive Income
The following table provides information relating to the losses (gains) recognized in the statements of income including the reclassifications of losses (gains) in accumulated other comprehensive (loss) income into expense/(income), net of tax, for the years ended December 31, 2018, 2017 and 2016:
 
December 31, 2018
 
December 31, 2017
 
December 31,
2016
 
(Dollars in thousands)
Losses (gains) on designated foreign exchange forward contracts:
 
 
 
 
 
Cost of goods sold
$
(2,270
)
 
$
(95
)
 
$
4,511

Total before tax
(2,270
)
 
(95
)
 
4,511

Taxes expense (benefit)
163

 
84

 
(1,010
)
Net of tax
$
(2,107
)
 
$
(11
)
 
$
3,501

Losses (gains) on cross-currency swaps (net investment hedge):
 
 
 
 
 
Interest expense
$
(3,277
)
 
$
—

 
$
—

Total before tax
(3,277
)
 
—

 
—

Tax expense
754

 
—

 
—

Net of tax
$
(2,523
)
 
$
—

 
$
—

Amortization of pension and other postretirement benefits items:
 
 
 
 
 
Actuarial losses (1)
$
7,305

 
$
6,904

 
$
6,965

Prior-service credits (1)
251

 
105

 
56

Total before tax
7,556

 
7,009

 
7,021

Tax benefit
(1,733
)
 
(2,496
)
 
(2,509
)
Net of tax
$
5,823

 
$
4,513

 
$
4,512

Impact on income from continuing operations, net of tax
$
1,193

 
$
4,502

 
$
8,013

(1)
These accumulated other comprehensive (loss) income components are included in the computation of net benefit cost of pension and other postretirement benefit plans (see Note 15 for additional information).