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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Income (Loss) Attributable to Parent [Abstract]
Net income from continuing operations					$ 8,285	$ 12,243	$ 34,753	$ 2,673	$ 83,849	$ 57,954	$ 119,199
Earnings allocated to unvested restricted shares									(95)	(15)	(10)
Net income from continuing operations attributable to common shareholders									83,754	57,939	119,189
Net income from discontinued operations					$ (4,474)	$ 9,722	$ (833)	$ (576)	$ 0	$ 3,839	$ 133,523
Denominator:
Weighted average number of common shares outstanding, basic and diluted (in shares)									761,139,011	773,445,341	854,638,497
Effect of unvested restricted shares (in shares)									926,463	1,155,138	62,258
Weighted average number of common shares outstanding - diluted (in shares)									762,065,474	774,600,479	854,700,755
Basic and diluted income per common share:
Net income from continuing operations allocated to common shareholders per share (in usd per share):									$ 0.11	$ 0.07	$ 0.14
Net income from discontinued operations allocated to common shareholders per share (in usd per share):									0.00	0.00	0.15
Net income per common share, basic and diluted (in dollars per share)	$ 0.03	$ 0.01	$ 0.03	$ 0.04	$ 0.00	$ 0.03	$ 0.04	$ 0.00	$ 0.11	$ 0.07	$ 0.29

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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.

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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.

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

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