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Earnings Per Share (Details) - Common Stock [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  |  |  |  |  |  |  |  | $ 46,564 | $ 13,913 | $ 32,595
Undistributed earnings |  |  |  |  |  |  |  |  | 7,954 | 6,284 | (4,741)
Basic |  |  |  |  |  |  |  |  | 54,518 | 20,197 | 27,854
Diluted |  |  |  |  |  |  |  |  | $ 59,148 | $ 21,865 | $ 30,307
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 17,128 | 18,360 | 19,182
Assumed conversion of Class A Common Stock (in shares) |  |  |  |  |  |  |  |  | 1,522 | 1,611 | 1,765
Dilutive options, awards and common stock equivalents (in shares) |  |  |  |  |  |  |  |  | 282 | 290 | 348
Total weighted average diluted Common Stock (in shares) |  |  |  |  |  |  |  |  | 18,932 | 20,261 | 21,295
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share (in dollars per share) | $ 1.40 | $ 0.98 | $ 0.73 | $ 0.10 | $ 0.32 | $ 0.31 | $ 0.30 | $ 0.18 | $ 3.18 | $ 1.10 | $ 1.45
Diluted earnings per share (in dollars per share) | 1.37 | 0.97 | 0.72 | 0.09 | 0.31 | 0.31 | 0.29 | 0.17 | $ 3.12 | $ 1.08 | $ 1.42
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  |  |  |  |  |  |  |  | $ 3,957 | $ 1,143 | $ 2,869
Undistributed earnings |  |  |  |  |  |  |  |  | 673 | 525 | (416)
Basic |  |  |  |  |  |  |  |  | $ 4,630 | $ 1,668 | $ 2,453
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 1,522 | 1,611 | 1,765
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share (in dollars per share) | 1.33 | 0.94 | 0.69 | 0.09 | 0.30 | 0.30 | 0.28 | 0.17 | $ 3.04 | $ 1.04 | $ 1.39
Diluted earnings per share (in dollars per share) | $ 1.35 | $ 0.93 | $ 0.69 | $ 0.09 | $ 0.30 | $ 0.30 | $ 0.27 | $ 0.17 | $ 3.04 | $ 1.03 | $ 1.39

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