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Changes in shareholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2012
Reconciliation Of Basic To Diluted Weighted Average Common Shares Outstanding | The following table provides a reconciliation of basic to diluted weighted average shares outstanding:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, 2012 |  |  | September 25, 2011 |  |  | September 30, 2012 |  |  | September 25, 2011 |
|  | (Shares in thousands) |
Basic |  |  | 40,890 |  |  |  | 40,684 |  |  |  | 40,831 |  |  |  | 40,426 |
Dilutive shares assumed issued |  |  | 621 |  |  |  | 259 |  |  |  | — |  |  |  | 312 |
Diluted |  |  | 41,511 |  |  |  | 40,943 |  |  |  | 40,831 |  |  |  | 40,738 |
Schedule of Accumulated Other Comprehensive Income | The following tables provide information relating to the changes in accumulated other comprehensive income (loss), net of tax, for the nine months ended September 30, 2012 and September 25, 2011:
|  | 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, 2011 |  | $ | (7,257 | ) |  | $ | (134,548 | ) |  | $ | (17,548 | ) |  | $ | (159,353 | )
Current-period other comprehensive income |  |  | 7,012 |  |  |  | 3,208 |  |  |  | 10,305 |  |  |  | 20,525 |
Balance at September 30, 2012 |  | $ | (245 | ) |  | $ | (131,340 | ) |  | $ | (7,243 | ) |  | $ | (138,828 | )
|  | 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, 2010 |  | $ | (15,262 | ) |  | $ | (95,746 | ) |  | $ | 59,128 |  |  | $ | (51,880 | )
Current-period other comprehensive income |  |  | 5,508 |  |  |  | 6,423 |  |  |  | 11,866 |  |  |  | 23,797 |
Divestiture of Marine |  |  | — |  |  |  | 8,427 |  |  |  | (33,424 | ) |  |  | (24,997 | )
Discontinued operations |  |  | — |  |  |  | 1 |  |  |  | 2,154 |  |  |  | 2,155 |
Balance at September 25, 2011 |  | $ | (9,754 | ) |  | $ | (80,895 | ) |  | $ | 39,724 |  |  | $ | (50,925 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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