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Shareholders' equity (Details) (USD $) | 3 Months Ended |  | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2014 Accounts payable and accrued expenses | Mar. 31, 2014 Amounts payable to affiliates | Mar. 31, 2014 Series C Convertible Units | Mar. 31, 2014 Class A Common Shares | Mar. 31, 2014 Series A Participating Preferred Shares | Feb. 28, 2014 Series A Participating Preferred Shares | Mar. 31, 2014 Series B Participating Preferred Shares | Feb. 28, 2014 Series B Participating Preferred Shares
Class of Stock |  |  |  |  |  |  |  |  |
Dividend payable per share |  |  |  | $ 0.15113 | $ 0.05 |  | $ 0.3125 |  | $ 0.35
Dividend payable date |  |  |  |  | Apr. 10, 2014 |  |  |  |
Dividend record date |  |  |  |  | Mar. 25, 2014 |  |  |  |
Dividend payable, amount |  | $ 8,900,000 | $ 400,000 | $ 4,500,000 |  |  |  |  |
Preferred Shares dividend rate |  |  |  |  |  |  | 5.00% |  | 5.00%
Quarterly distributions to preferred shareholders | $ 3,121,000 |  |  |  |  | $ 1,600,000 |  | $ 1,500,000 |

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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