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Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income / (loss) (numerator): |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations |  |  |  |  |  |  |  |  | $ (47,948) | $ (33,092) | $ (20,074)
Income from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 1,008
Noncontrolling interest |  |  |  |  |  |  |  |  | 14,353 | 14,965 | 13,245
Dividends on preferred shares |  |  |  |  |  |  |  |  | 22,276 | 18,928 | 1,160
Conversion of preferred units |  |  |  |  |  |  |  |  | 0 | 0 | 10,456
Net loss attributable to common shareholders | $ (20,474) | $ (28,616) | $ (17,697) | $ (17,790) | $ (19,312) | $ (21,747) | $ (12,250) | $ (13,676) | $ (84,577) | $ (66,985) | $ (43,927)
Weighted-average shares (denominator) |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding-basic and diluted (in shares) |  |  |  |  |  |  |  |  | 210,600,111 | 196,348,757 | 123,592,086
Net loss per share—basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.40) | $ (0.34) | $ (0.37)
Income from discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | 0.00 | 0.00 | 0.01
Net loss attributable to common shareholders per share - basic and diluted (in dollars per share) | $ (0.10) | $ (0.14) | $ (0.08) | $ (0.08) | $ (0.09) | $ (0.11) | $ (0.07) | $ (0.07) | $ (0.40) | $ (0.34) | $ (0.36)

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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