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Equity - Initial Public Offering of Common Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 2 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 26, 2018 | Jul. 17, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Feb. 28, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Net proceeds from IPO |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 133,805
Preferred dividend paid (in dollars per share) |  |  |  | $ 0.15 |  |  |  |
Conversion of Series A to Common Shares |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares converted (in shares) | 37,700,000 |  | 37,700,000 |  |  |  |  |
Common shares issued on conversion (in shares) | 39,600,000 |  | 39,600,000 |  |  |  |  |
Right to receive cash payment per share (in dollars per share) | $ 1.75 |  |  |  |  |  |  |
Right to receive cash payment less paid dividends per share (in dollars per share) | $ 1.60 |  |  |  |  |  |  |
Cash payment for conversion of preferred shares | $ 60,000 |  |  |  |  |  |  |
Common Stock | Conversion of Series A to Common Shares |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares converted per each share of preferred stock (in shares) | 1.05 |  |  |  |  |  |  |
Series A Preferred Stock Conversion and Common Stock Offering |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Net proceeds from IPO | $ 110,000 |  |  |  |  |  |  |
Increase in common stock outstanding (in shares) | 8,695,653 | 8,695,653 |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 14.00 |  |  |  |  |  |  |
Cash payment for conversion of preferred shares | $ 60,000 |  |  |  |  |  |  |
Sale of stock, consideration received | $ 27,000 |  | $ 27,000 |  |  |  |  |
Reduction in income available to common stockholders |  |  |  |  |  |  |  | $ 87,000
Over-allotment option |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 14.00 |  |  |  |  |  |  |
Sale of stock, underwriter option to purchase additional shares (in shares) | 1,900,000 |  | 1,900,000 |  |  |  |  |

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