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Earnings Per Share and Equity Transactions - Reconciliation of Basic and Diluted Income per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:                
Net income (loss) $ 3,992 $ 1,499 $ (100) $ 1,677 $ (9,611) $ (3,486) $ 5,391 $ (11,420)
Denominator:                
Weighted average common shares outstanding - basic (in shares) 71,261,403     71,945,847     71,731,832 72,072,252
Effect of unvested restricted shares (in shares) 134,222     63,362     70,250 0
Weighted average common shares outstanding - diluted (in shares) 71,395,625     72,009,209     71,802,082 72,072,252
Basic and diluted earnings per common share:                
Net income (loss) per common share, basic (in dollars per share) $ 0.06     $ 0.02     $ 0.08 $ (0.16)
Net income (loss) per common share, diluted (in dollars per share) $ 0.06     $ 0.02     $ 0.08 $ (0.16)