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Shareholders’ equity (Tables)

3 Months Ended

Mar. 31, 2014

Stockholders' Equity Note [Abstract]

Common and Preferred Stock Activity

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
(in shares)	Series A convertible			Treasury		Outstanding
Beginning balance as of December 31, 2013	79,620			4,786,521		88,710,277
Conversion of convertible preferred stock	(255	)		—		25,542
Issuance for share-based compensation plans	—			—		35,624
Ending balance as of March 31, 2014	79,365			4,786,521		88,771,443
Beginning balance as of December 31, 2012	80,283			4,786,521		88,548,637
Conversion of convertible preferred stock	(199	)		—		19,864
Issuance for share-based compensation plans	—			—		27,708
Ending balance as of March 31, 2013	80,084			4,786,521		88,596,209

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Tabular disclosure of the change in preferred stock, treasury stock and common stock outstanding.

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