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Shareholders' Equity - Distributions (Details) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Class of Stock [Line Items] |  |  |  |
Common stock dividend declared (in dollars per share) | $ 0.05 | $ 0.05 | $ 0.1 | $ 0.1
Series D Convertible Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) |  | $ 0.035 |  |
Convertible units, percent of class A units (as a percent) |  | 70.00% |  |
Class A common shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividend declared (in dollars per share) | 0.05 | $ 0.05 |  |
Class B common shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividend declared (in dollars per share) | 0.05 | 0.05 |  |
5.0% Series A Participating Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 0.3125 | 0.3125 |  |
Preferred stock, dividend rate, percentage | 5.00% |  | 5.00% |
5.0% Series B Participating Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 0.3125 | 0.3125 |  |
Preferred stock, dividend rate, percentage | 5.00% |  | 5.00% |
5.5% Series C Participating Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 0.34375 | 0.34375 |  |
Preferred stock, dividend rate, percentage | 5.50% |  | 5.50% |
Series D Perpetual Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 0.40625 | $ 0.17153 |  |
Preferred stock, dividend rate, percentage | 6.50% |  |  |
Series E Perpetual Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 0.39688 |  |  |
Preferred stock, dividend rate, percentage | 6.35% |  |  |
Series F Perpetual Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 0.27335 |  |  |
Series F Perpetual Preferred Shares | Underwritten Public Offering |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, dividend rate, percentage | 5.875% |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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