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Related Party Transactions (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2016 | Dec. 31, 2019 | Dec. 31, 2018
Class A Common Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 0 | 0 |  |  |
Series A Preferred Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Preferred stock dividends declared and paid |  |  |  | $ 11,103 | $ 11,103
Affiliated Entity | Series A Preferred Stock | KKR And Snow Phipps |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  |  | 60,000 |  |
Preferred stock dividends declared and paid |  |  |  | $ 1,822 |
Affiliated Entity | Series A-2 Preferred Stock | KKR And Snow Phipps |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  |  | 15,000 |  |

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