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Shareholders’ equity (Tables) | 9 Months Ended
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Sep. 30, 2013
Stockholders' Equity Note [Abstract] |
Schedule of Stockholders Equity | See Common and Preferred Stock Activity table below for additional information about preferred stock conversions during the period.
Common and Preferred Stock Activity: | Preferred stock | Common stock
| Series A convertible | Treasury | Outstanding
Beginning balance as of December 31, 2012 | 80,283 |  | 4,786,521 |  | 88,548,637 |
Conversion of convertible preferred stock | (549 | ) | — |  | 54,825 |
Issuance for stock compensation plans | — |  | — |  | 79,469 |
Ending balance as of September 30, 2013 | 79,734 |  | 4,786,521 |  | 88,682,931 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Details
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