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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