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Shareholders’ equity (Tables) | 3 Months Ended
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Mar. 31, 2012
Stockholders' Equity Note [Abstract] |
Schedule of Stockholders Equity | The rights, preferences and privileges of holders of our common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of our preferred stock which are currently outstanding, including our Series A Convertible Preferred Stock, or any series which we may designate and issue in the future.
Common and Preferred Stock Activity: | Preferred stock | Common stock
| Series A convertible | Treasury | Outstanding
Beginning balance as of December 31, 2011 | 80,718 |  | 4,386,521 |  | 88,844,327 |
Repurchase of common stock | — |  | 400,000 |  | (400,000 | )
Conversion of convertible preferred stock | (22 | ) | — |  | 2,225 |
Issuance for stock compensation plans | — |  | — |  | 3,104 |
Ending balance as of March 31, 2012 | 80,696 |  | 4,786,521 |  | 88,449,656 |

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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 -Topic 505 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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