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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, 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 (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income 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
Earnings allocated to unvested restricted shares |  |  |  |  |  |  |  |  | 0 | (29) | (95)
Net (loss) income from continuing operations attributable to common shareholders |  |  |  |  |  |  |  |  | (10,174) | 63,870 | 83,754
Net (loss) income from discontinued operations attributable to common shareholders | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (12,000) | $ (13,500) | $ 0 | $ (25,500) | $ 0
Denominator: |  |  |  |  |  |  |  |  |  |  |
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
Effect of unvested restricted shares (in shares) |  |  |  |  |  |  |  |  | 0 | 763,840 | 926,463
Weighted average number of common shares outstanding - diluted | 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
Basic and diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Net (loss) income from continuing operations per share (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.01) | $ 0.09 | $ 0.11
Net loss from discontinued operations per share (in dollars per share) |  |  |  |  | $ 0 | $ 0 | $ (0.02) | $ (0.02) | 0 | (0.04) | 0
Net (loss) income 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

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1337-109256 + Details
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