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Shareholders' Equity - Participating Preferred Shares (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) market | Sep. 30, 2015
Class of Stock [Line Items] |  |  |
Cumulative change in value of index based on purchase prices |  | 50.00% |
Number of top markets used for purchase price index | market |  | 20 |
Liquidation preference value | $ | $ 470.9 | $ 470.9 |
5.0% Series A Participating Preferred Shares |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, dividend rate, percentage | 5.00% | 5.00% | 5.00%
5.0% Series B Participating Preferred Shares |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, dividend rate, percentage | 5.00% | 5.00% | 5.00%
5.5% Series C Participating Preferred Shares |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, dividend rate, percentage | 5.50% | 5.50% | 5.50%

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