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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
	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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Amount after tax of income (loss) from continuing operations attributable to the parent.

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