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Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2019 | Aug. 28, 2019 | Jul. 15, 2019 | May 24, 2019 | Apr. 19, 2019 | Mar. 21, 2019 | Jan. 16, 2019 | Dec. 06, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) |  | $ 0.04 |  | $ 0.04 |  | $ 0.04 |  | $ 0.04 | $ 0.04 | $ 0 | $ 0.12 | $ 0
Cash dividends declared |  | $ 5,564 |  | $ 6,233 |  | $ 5,896 |  | $ 5,838 |  |  |  |
Exchangeable Shares |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid (in dollars per share) |  |  | $ 0.04 |  | $ 0.04 |  | $ 0.04 |  |  |  |  |
Exchangeable Shares | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid (in dollars per share) | $ 0.04 |  |  |  |  |  |  |  |  |  |  |

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