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Subsequent events (Details) (USD $) | 9 Months Ended |  | 1 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 5.0% Series A Participating Preferred Shares | Sep. 30, 2014 5.0% Series B Participating Preferred Shares | Sep. 30, 2014 Senior Secured Revolving Credit Facility | Oct. 31, 2014 Subsequent Events Properties acquired through recurring acquisition channels, including foreclosure auctions and broker sales property | Oct. 31, 2014 Subsequent Events 5.50% Series C participating preferred shares | Oct. 31, 2014 Subsequent Events Class A common shares | Oct. 31, 2014 Subsequent Events Class B common shares | Oct. 31, 2014 Subsequent Events 5.0% Series A Participating Preferred Shares | Oct. 31, 2014 Subsequent Events 5.0% Series B Participating Preferred Shares | Oct. 31, 2014 Subsequent Events Senior Secured Revolving Credit Facility
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  |  |  |  |  | 971 |  |  |  |  |  |
Aggregate purchase price of properties acquired | $ 914,059,000 | $ 1,712,119,000 |  |  |  | $ 150,500,000 |  |  |  |  |  |
Credit facility, additional borrowings, amount | 1,174,000,000 | 1,044,000,000 |  |  |  |  |  |  |  |  |  | 251,000,000
Credit facility, amount paid | 1,467,000,000 | 806,000,000 |  |  |  |  |  |  |  |  |  | 60,000,000
Credit facility, amount outstanding |  |  |  |  | $ 82,000,000 |  |  |  |  |  |  | $ 273,000,000
Quarterly dividends (in dollars per share) |  |  |  |  |  |  | $ 0.34375 | $ 0.05 | $ 0.05 | $ 0.3125 | $ 0.3125 |
Rate of Preferred units |  |  | 5.00% | 5.00% |  |  | 5.50% |  |  | 5.00% | 5.00% |

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