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Shareholders’ equity (Tables)

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Common and Preferred Stock Activity

The Common and Preferred Stock Activity table below contains additional information about preferred stock conversions during 2014, 2013 and 2012:

Common and Preferred Stock Activity:	Preferred stock		Common stock
(in shares)	Series A convertible		Treasury		Outstanding
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	(435	)	—		43,556
Issuance for share-based compensation plans	—		—		60,754
Balance as of December 31, 2012	80,283		4,786,521		88,548,637
Conversion of convertible preferred stock	(663	)	—		66,244
Issuance for share-based compensation plans	—		—		95,396
Balance as of December 31, 2013	79,620		4,786,521		88,710,277
Conversion of convertible preferred stock	(1,479	)	—		147,952
Issuance for share-based compensation plans	—		—		206,353
Balance as of December 31, 2014	78,141		4,786,521		89,064,582

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

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