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Earnings per share (Details 2)	3 Months Ended
Earnings per share (Details 2)	Mar. 31, 2015	Mar. 31, 2014
Earnings per share
Total weighted average shares	74,044,394	65,292,016

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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