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Quarterly Supplemental Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Supplemental Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total income | $ 51,211 | $ 52,545 | $ 41,639 | $ 52,438 | $ 54,740 | $ 58,169 | $ 57,190 | $ 56,391 | $ 197,833 | $ 226,490 | $ 242,674
Net income (loss) from continuing operations | 1,246 | 1,677 | (9,611) | (3,486) | 28,694 | 24,926 | 6,278 | 4,001 | (10,174) | 63,899 | 83,849
Net loss from discontinued operations | 0 | 0 | 0 | 0 | 0 | 0 | (12,000) | (13,500) | 0 | (25,500) | 0
Net income (loss) | $ 1,246 | $ 1,677 | $ (9,611) | $ (3,486) | $ 28,694 | $ 24,926 | $ (5,722) | $ (9,499) | $ (10,174) | $ 38,399 | $ 83,849
Net loss per common share, from discontinued operations, basic and diluted (in dollars per share) |  |  |  |  | $ 0 | $ 0 | $ (0.02) | $ (0.02) | $ 0 | $ (0.04) | $ 0
Net income (loss), per common share, basic and diluted (in dollars per share) | $ 0 | $ 0 | $ (0.01) | $ 0 | $ 0.04 | $ 0.03 | $ (0.01) | $ (0.01) | $ (0.01) | $ 0.05 | $ 0.11
Weighted average number of common shares outstanding, basic (in shares) | 718,940,463 | 718,934,723 | 720,849,620 | 720,825,864 | 728,544,149 | 728,722,763 | 728,654,374 | 728,558,989 | 719,882,476 | 728,620,309 | 761,139,011
Weighted average number of common shares outstanding, diluted (in shares) | 719,858,839 | 719,568,339 | 720,849,620 | 720,825,864 | 729,536,570 | 729,456,722 | 729,287,663 | 728,827,861 | 719,882,476 | 729,384,149 | 762,065,474

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