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Shareholders’ equity (Tables)

3 Months Ended

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

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