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Shareholders' equity | 12 Months Ended
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Dec. 31, 2012
Shareholders' equity | Note 12 — Shareholders’ equity The authorized capital of the Company is comprised of 200 million common shares, $1 par value, and 500,000 preference shares. No preference shares have been outstanding during the last three years. On June 14, 2007, the Company’s Board of Directors authorized the repurchase of up to $300 million of outstanding Company common stock. Repurchases of Company stock under the Board authorization may be made from time to time in the open market and may include privately-negotiated transactions as market conditions warrant and subject to regulatory considerations. The stock repurchase program has no expiration date, and the Company’s ability to execute on the program will depend on, among other factors, cash requirements for acquisitions, cash generation from operations, debt repayment obligations, market conditions and regulatory requirements. In addition, under the Company’s senior credit and Senior Note agreements, the Company is subject to certain restrictions relating to its ability to repurchase shares in the event the Company’s consolidated leverage ratio exceeds certain levels, which may further limit the Company’s ability to repurchase shares under this Board authorization. Through December 31, 2012, no shares have been purchased under this Board authorization. Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed in the same manner except that the weighted average number of shares is increased for dilutive securities. The difference between basic and diluted weighted average common shares results from the assumption that dilutive stock options were exercised. 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 |
Weighted average stock options having 9,041 thousand, 8,825 thousand and 4,391 thousand underlying shares for 2012, 2011 and 2010, respectively, were antidilutive and therefore not included in the calculation of earnings per share. 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 The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7, 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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