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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