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Perpetual Convertible Preferred Shares - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Aug. 08, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Temporary Equity [Line Items] |  |  |
Transaction-related expenses incurred |  | $ 1,679 | $ 0
Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Stock purchase price (usd per share) | $ 25.00 |  |
Restrictive period after closing date on transferring shares or economic interest | 5 years |  |
Quarterly distributions entitlement rate as percent of varying rate (percent) | 25.00% |  |
Liquidation preference (usd per share) | $ 25.00 |  |
Redemption fee (percent) | 1.50% |  |
Preferred Stock Issuance | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Aggregate number of shares to be purchased under transaction agreement (shares) | 10,000,000 |  |
First Issuance | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Aggregate number of shares to be purchased under transaction agreement (shares) | 5,000,000 |  |
Redemption rights, period from issuance | 5 years |  |
Conversion rights, period from issuance | 5 years |  |
Secondary Issuance | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Aggregate number of shares to be purchased under transaction agreement (shares) | 5,000,000 |  |
Stock purchase price | $ 125,000 |  |
Additional shares to be purchased (shares) | 5,000,000 |  |
Conversion rights, period from issuance | 5 years |  |
Triggering event | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Redemption price per share (usd per share) | $ 25.00 |  |
EA-1 | First Issuance | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Aggregate number of shares to be purchased under transaction agreement (shares) | 5,000,000 |  |
Stock purchase price | $ 125,000 |  |
Transaction fees paid (percent) | 3.50% |  |
Transaction-related expenses incurred | $ 400 |  |
EA-1 | Advisor | First Issuance | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Transaction-related expenses incurred | $ 200 |  |
Aug 8, 2018 | From and After First issuance Until Fifth Anniversary | First Issuance | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Initial annual distribution (percent) |  | 6.55% |
Anniversary period since issuance date |  | 5 years |
Aug 8, 2018 | From and After Second Issuance Date Until Fifth Anniversary | Secondary Issuance | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Initial annual distribution (percent) |  | 6.55% |
Anniversary period since issuance date |  | 5 years |
Aug 8, 2018 | From and After Reset Date | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Initial annual distribution (percent) | 6.75% |  |
Aug 2, 2020 | After First Triggering Event but Before Reset Date | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Initial annual distribution (percent) |  | 7.55% |
Aug 2, 2020 | After First Triggering Event and Also After Reset Date | Reset date | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Initial annual distribution (percent) |  | 7.75% |
Aug 2, 2021 | Reset date | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Initial annual distribution (percent) |  | 8.25% |
Aug 2, 2021 | Triggering event | Series A Cumulative Perpetual Convertible Preferred Stock |  |  |
Temporary Equity [Line Items] |  |  |
Initial annual distribution (percent) |  | 8.05% |

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