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Shareholders' Equity - Participating Preferred Shares (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) market
Class of Stock [Line Items] |  |
Cumulative change in value of index based on purchase prices (as a percent) |  | 50.00%
Number of top markets used for purchase price index | market |  | 20
Liquidation preference value | $ | $ 480.0 | $ 480.0
5.0% Series A Participating Preferred Shares |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, percentage | 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%
5.5% Series C Participating Preferred Shares |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate, percentage | 5.50% | 5.50%

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- Definition Number of Top Markets Used for Purchase Price Index + References No definition available. + Details
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- Definition Preferred Stock, Cumulative Change In Value Of Index Based On Purchase Prices. + References No definition available. + Details
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