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Stockholders' Equity (Details) - Common Stock [Member] $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 $ / shares | Dec. 31, 2018 $ / shares | Dec. 31, 2020 USD ($) Vote $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Cash dividend paid (in dollars per share) | $ / shares | $ 2.00 | $ 1.00 | $ 2.77 | $ 0.76 | $ 1.72
Cash dividends paid | $ |  |  | $ 46,564 | $ 13,913 | $ 32,595
Minimum [Member] |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Preferential dividend rate as a percentage of dividend paid on Class A Common Stock | 105.00% |  | 105.00% |  |
Class A Common Stock [Member] |  |  |  |  |
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Percentage of directors that can be voted on in election |  |  | 75.00% |  |
Number of votes per share | Vote |  |  | 10 |  |
Conversion basis |  |  | 1-for-1 basis |  |
Cash dividend paid (in dollars per share) | $ / shares | $ 1.90 | $ 0.95 | $ 2.62 | $ 0.72 | $ 1.63
Cash dividends paid | $ |  |  | $ 3,957 | $ 1,143 | $ 2,869

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