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Earnings Per Share and Equity Transactions - Reconciliation of Amounts Used in Calculating Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | $ 28,694 | $ 24,926 | $ 6,278 | $ 4,001 |  |  |  |  | $ 63,899 | $ 83,849 | $ 57,954
Earnings allocated to unvested restricted shares |  |  |  |  |  |  |  |  | (29) | (95) | (15)
Net income from continuing operations attributable to common shareholders |  |  |  |  |  |  |  |  | 63,870 | 83,754 | 57,939
Net (loss) income from discontinued operations | $ 0 | $ 0 | $ (12,000) | $ (13,500) |  |  |  |  | $ (25,500) | $ 0 | $ 3,839
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding, basic | 728,544,149 | 728,722,763 | 728,654,374 | 728,558,989 | 727,904,818 | 768,385,770 | 774,391,881 | 774,311,254 | 728,620,309 | 761,139,011 | 773,445,341
Effect of unvested restricted shares (in shares) |  |  |  |  |  |  |  |  | 763,840 | 926,463 | 1,155,138
Weighted average number of common shares outstanding - diluted | 729,536,570 | 729,456,722 | 729,287,663 | 728,827,861 | 728,973,047 | 769,306,859 | 774,930,240 | 774,394,732 | 729,384,149 | 762,065,474 | 774,600,479
Basic and diluted income per common share: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations allocated to common shareholders per share (in usd per share): |  |  |  |  |  |  |  |  | $ 0.09 | $ 0.11 | $ 0.07
Net income, per common share, from discontinued operations, basic and diluted (in dollars per share) | $ 0 | $ 0 | $ (0.02) | $ (0.02) |  |  |  |  | (0.04) | 0 | 0
Net income per common share, basic and diluted (in dollars per share) | $ 0.04 | $ 0.03 | $ (0.01) | $ (0.01) | $ 0.03 | $ 0.01 | $ 0.03 | $ 0.04 | $ 0.05 | $ 0.11 | $ 0.07

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