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Shareholders’ equity (Tables)

3 Months Ended

Mar. 31, 2013

Stockholders' Equity Note [Abstract]

Schedule of Stockholders Equity

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
Repurchase of common stock	—		—		—
Conversion of convertible preferred stock	(199	)	—		19,864
Issuance for stock compensation plans	—		—		27,708
Ending balance as of March 31, 2013	80,084		4,786,521		88,596,209

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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

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