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Stockholders' Equity - Reconciliation of Weighted Average Shares (Details) - USD ($) $ 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
Net income: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 23,882 | $ 16,636 | $ (6,139) | $ 12,191 | $ 17,126 | $ 17,895 | $ 15,984 | $ 16,552 | $ 46,570 | $ 67,557 | $ 53,057
Dividends and undistributed earnings allocated to participating securities (1) |  |  |  |  |  |  |  |  | (7) | (57) | (223)
Net income allocated to common shareholders |  |  |  |  |  |  |  |  | $ 46,563 | $ 67,500 | $ 52,834
Basic: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 36,018,627 | 36,789,244 | 35,281,408
Restricted stock awards (in shares) |  |  |  |  |  |  |  |  | (4,182) | (31,014) | (87,405)
Total basic weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 36,014,445 | 36,758,230 | 35,194,003
Diluted: |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 36,014,445 | 36,758,230 | 35,194,003
Effect of potentially dilutive common shares (in shares) |  |  |  |  |  |  |  |  | 155,621 | 227,536 | 177,587
Total diluted weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 36,170,066 | 36,985,766 | 35,371,590

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