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Shareholders' equity (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Schedule of Weighted Average Number of Shares
The following table provides a reconciliation of basic to diluted weighted average shares outstanding:
 
2016
 
2015
 
2014
 
(Shares in thousands)
Basic
43,325

 
41,558

 
41,366

Dilutive effect of share based awards
570

 
488

 
450

Dilutive effect of 3.875% Convertible Notes and warrants
3,751

 
6,012

 
4,654

Diluted
47,646

 
48,058

 
46,470
Schedule of Accumulated Other Comprehensive Income (Loss)
The following tables provide information relating to the changes in accumulated other comprehensive income (loss), net of tax, for the years ended December 31, 2016 and 2015:
 
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, 2014
$
—

 
$
(141,744
)
 
$
(119,151
)
 
$
(260,895
)
Other comprehensive income (loss) before reclassifications
(2,974
)
 
(1,276
)
 
(110,595
)
 
(114,845
)
Amounts reclassified from accumulated other comprehensive income (loss)
483

 
4,133

 
—

 
4,616

Net current-year other comprehensive income (loss)
(2,491
)
 
2,857

 
(110,595
)
 
(110,229
)
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
3,501

 
4,512

 
—

 
8,013

Net current-year other comprehensive (loss) income
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
)
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, 2016, 2015 and 2014 :
 
December 31, 2016
 
December 31, 2015
 
December 31,
2014
 
(Dollars in thousands)
Losses (gains) on designated foreign exchange contracts:
 
 
 
 
 
Cost of goods sold
$
4,511

 
$
679

 
$
(705
)
Total before tax
4,511

 
679

 
(705
)
Taxes
(1,010
)
 
(196
)
 
111

Net of tax
$
3,501

 
$
483

 
$
(594
)
Amortization of pension and other postretirement benefits items:
 
 
 
 
 
Actuarial losses (1)
$
6,965

 
$
6,375

 
$
4,385

Prior-service credits (1)
56

 
—

 
(21
)
Total before tax
7,021

 
6,375

 
4,364

Tax benefit
(2,509
)
 
(2,242
)
 
(1,535
)
Net of tax
$
4,512

 
$
4,133

 
$
2,829

Total reclassifications, net of tax
$
8,013

 
$
4,616

 
$
2,235

(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).