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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2012
Reconciliation of Basic to Diluted Weighted Average Common Shares Outstanding | A reconciliation of basic to diluted weighted average shares outstanding is as follows:
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (Shares in thousands) |
Basic shares |  |  | 40,859 |  |  |  | 40,501 |  |  |  | 39,906 |
Dilutive shares assumed issued |  |  | — |  |  |  | 300 |  |  |  | 374 |
Diluted shares |  |  | 40,859 |  |  |  | 40,801 |  |  |  | 40,280 |
Change in Accumulated Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive income (loss) for 2012 and 2011 are as follows:
|  | 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 (loss) |  |  | 8,070 |  |  |  | (47,878 | ) |  |  | (52,989 | ) |  |  | (92,797 | )
Divestiture of businesses |  |  | — |  |  |  | 9,076 |  |  |  | (23,687 | ) |  |  | (14,611 | )
Discontinued operations |  |  | (65 | ) |  |  | — |  |  |  | — |  |  |  | (65 | )
Balance at December 31, 2011 |  |  | (7,257 | ) |  |  | (134,548 | ) |  |  | (17,548 | ) |  |  | (159,353 | )
Current-period other comprehensive income |  |  | 6,876 |  |  |  | 7,291 |  |  |  | 13,138 |  |  |  | 27,305 |
Balance at December 31, 2012 |  | $ | (381 | ) |  | $ | (127,257 | ) |  | $ | (4,410 | ) |  | $ | (132,048 | )

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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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