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Shareholders' equity (Details) (USD $) | 6 Months Ended |  | 1 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | May 31, 2014 Accounts payable and accrued expenses | May 31, 2014 Series C Convertible Units | May 31, 2014 Class A Common Shares | May 31, 2014 Series A participating preferred shares | May 31, 2014 Series B participating preferred shares | May 02, 2014 Series C Participating Preferred Shares | May 31, 2014 Series C Participating Preferred Shares
Class of Stock |  |  |  |  |  |  |  |
Preferred units issued |  |  |  |  |  |  | 7,600,000 |
Net proceeds from issuance of Preferred shares | $ 189,433,000 |  |  |  |  |  | $ 190,000,000 |
Rate of Preferred units |  |  |  |  |  |  | 5.50% |
Offering costs |  |  |  |  |  |  | 9,700,000 |
Dividend payable per share |  |  | $ 0.15113 | $ 0.05 | $ 0.3125 | $ 0.3125 |  | $ 0.225347
Dividend payable date |  |  |  | Jun. 30, 2014 |  |  |  |
Dividend record date |  |  |  | Jun. 15, 2014 |  |  |  |
Dividend payable, amount |  | 9,300,000 | 4,700,000 |  |  |  |  |
Preferred Shares dividend rate |  |  |  |  | 5.00% | 5.00% |  | 5.50%
Quarterly distributions to preferred shareholders | $ 7,790,000 |  |  |  | $ 1,600,000 | $ 1,400,000 |  | $ 1,700,000

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