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Shareholders’ equity (Tables)

12 Months Ended

Dec. 31, 2013

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 2013, 2012 and 2011:

Common and Preferred Stock Activity:	Preferred stock		Common stock
(in shares)	Series A convertible		Treasury		Outstanding
Balance as of December 31, 2010	82,515		—		92,771,864
Repurchase of common stock	—		4,386,521		(4,386,521	)
Conversion of convertible preferred stock	(1,797	)	—		179,692
Issuance for share-based compensation plans	—		—		279,292
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

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