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Shareholders' equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Weighted Average Number of Shares
The following table provides a reconciliation of basic to diluted weighted average shares outstanding:
 
2017
 
2016
 
2015
 
(Shares in thousands)
Basic
45,004

 
43,325

 
41,558

Dilutive effect of share based awards
923

 
570

 
488

Dilutive effect of 3.875% Convertible Notes and warrants
737

 
3,751

 
6,012

Diluted
46,664

 
47,646

 
48,058
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table provides information relating to the changes in accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2017 and 2016:
 
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, 2015
$
(2,491
)
 
$
(138,887
)
 
$
(229,746
)
 
$
(371,124
)
Other comprehensive income (loss) before reclassifications
(3,434
)
 
(2,221
)
 
(69,119
)
 
(74,774
)
Amounts reclassified from accumulated other comprehensive income (loss)
3,501

 
4,512

 
—

 
8,013

Net current-year other comprehensive income (loss)
67

 
2,291

 
(69,119
)
 
(66,761
)
Reclassification related to acquisition of noncontrolling interest
—

 
—

 
(832
)
 
(832
)
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
(11
)
 
4,513

 
—

 
4,502

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

 
(2,212
)
 
173,074

 
173,626

Balance at December 31, 2017
$
340

 
$
(138,808
)
 
$
(126,623
)
 
$
(265,091
)
Reclassification out of Accumulated Other Comprehensive Income
The following table provides information relating to the reclassifications of losses/(gains) in accumulated other comprehensive (loss) income into expense/(income), net of tax, for the years ended December 31, 2017, 2016 and 2015 :
 
December 31, 2017
 
December 31, 2016
 
December 31,
2015
 
(Dollars in thousands)
Losses (gains) on designated foreign exchange contracts:
 
 
 
 
 
Cost of goods sold
$
(95
)
 
$
4,511

 
$
679

Total before tax
(95
)
 
4,511

 
679

Taxes (benefit)
84

 
(1,010
)
 
(196
)
Net of tax
$
(11
)
 
$
3,501

 
$
483

Amortization of pension and other postretirement benefits items:
 
 
 
 
 
Actuarial losses (1)
$
6,904

 
$
6,965

 
$
6,375

Prior-service credits (1)
105

 
56

 
—

Total before tax
7,009

 
7,021

 
6,375

Tax benefit
(2,496
)
 
(2,509
)
 
(2,242
)
Net of tax
$
4,513

 
$
4,512

 
$
4,133

Total reclassifications, net of tax
$
4,502

 
$
8,013

 
$
4,616

(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 14 for additional information).