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Shareholders' equity (Tables)

3 Months Ended

Mar. 31, 2016

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 the three months ended March 31, 2016 and 2015.

Common and Preferred Stock Activity:	Preferred stock			Common stock
(in shares)	Series A convertible			Treasury		Outstanding
Beginning balance as of December 31, 2015	76,539			7,186,521		87,038,050
Repurchase of common stock	—			—		—
Conversion of convertible preferred stock	(93	)		—		9,305
Issuance for share-based compensation plans	—			—		12,378
Ending balance as of March 31, 2016	76,446			7,186,521		87,059,733
Beginning balance as of December 31, 2014	78,141			4,786,521		89,064,582
Repurchase of common stock	—			1,200,000		(1,200,000	)
Conversion of convertible preferred stock	(80	)		—		7,947
Issuance for share-based compensation plans	—			—		10,828
Ending balance as of March 31, 2015	78,061			5,986,521		87,883,357

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

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