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Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 9,338 | $ (167) | $ (3,753) | $ 5,028 | $ (11,347) | $ (19,938) | $ (8,398) | $ (8,265) | $ 10,446 | $ (47,948) | $ (33,092)
Noncontrolling interest |  |  |  |  |  |  |  |  | 3,751 | 14,353 | 14,965
Dividends on preferred shares |  |  |  |  |  |  |  |  | 40,237 | 22,276 | 18,928
Net loss attributable to common shareholders | $ 2,391 | $ (21,152) | $ (10,404) | $ (4,377) | $ (20,474) | $ (28,616) | $ (17,697) | $ (17,790) | $ (33,542) | $ (84,577) | $ (66,985)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding–basic and diluted (in shares) |  |  |  |  |  |  |  |  | 234,010,168 | 210,600,111 | 196,348,757
Net loss per share—basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common shareholders per share - basic and diluted (in dollars per share) |  |  |  |  | $ (0.10) | $ (0.14) | $ (0.08) | $ (0.08) | $ (0.14) | $ (0.40) | $ (0.34)

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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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- Definition Amount of Income (Loss) attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4613673-111683 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256 + Details
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