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Earnings Per Share and Equity Transactions - Reconciliation of Basic and Diluted Income per Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:            
Net income (loss) $ 1,499,000 $ (100,000) $ (9,611,000) $ (3,486,000) $ 1,399,000 $ (13,097,000)
Earnings allocated to unvested restricted shares 0   0   0 0
Net income (loss) attributed to common shareholders $ 1,499,000   $ (9,611,000)   $ 1,399,000 $ (13,097,000)
Denominator:            
Weighted average number of common shares outstanding - basic (in shares) 71,943,522   72,137,317   71,970,925 72,136,129
Effect of unvested restricted shares (in shares) 92,804   0   53,528 0
Weighted average number of common shares outstanding - diluted (in shares) 72,036,326   72,137,317   72,024,453 72,136,129
Basic and diluted earnings per common share:            
Net income (loss) per common share, basic (in dollars per share) $ 0.02   $ (0.13)   $ 0.02 $ (0.18)
Net income (loss) per common share, diluted (in dollars per share) $ 0.02   $ (0.13)   $ 0.02 $ (0.18)