Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Loss from continuing operations		$ (956)	$ (8,432)	$ (4,643)	$ (25,066)
Allocation of earnings to unvested restricted share awards to continuing operations		(151)	47	(453)	118
Adjusted loss from continuing operations attributable to the controlling interests		(1,107)	(8,385)	(5,096)	(24,948)
Income from discontinued operations		0	341,202	0	354,418
Allocation of earnings to unvested restricted share awards to discontinued operations		0	(1,841)	0	(1,870)
Adjusted income from discontinuing operations		0	339,361	0	352,548
Adjusted net (loss) income attributable to the controlling interests		$ (1,107)	$ 330,976	$ (5,096)	$ 327,600
Denominator:
Weighted average shares outstanding - basic (in shares)		82,186	79,981	82,142	79,933
Employee restricted share awards (in shares)		0	0	0	0
Operating partnership units (in shares)		0	0	0	0
Weighted average shares outstanding - diluted (in shares)		82,186	79,981	82,142	79,933
Earnings per common share, basic:
Continuing operations, basic (in dollars per share)		$ (0.01)	$ (0.10)	$ (0.06)	$ (0.31)
Discontinued operations, basic (in dollars per share)		0	4.24	0	4.41
Basic net income (loss) attributable to the controlling interests per common share (in dollars per share)	[1]	(0.01)	4.14	(0.06)	4.10
Earnings per common share, diluted:
Continuing operations, diluted (in dollars per share)		(0.01)	(0.10)	(0.06)	(0.31)
Discontinued operations, diluted (in dollars per share)		0	4.24	0	4.41
Diluted net income (loss) attributable to the controlling interests per common share (in dollars per share)	[1]	(0.01)	4.14	(0.06)	4.10
Dividends declared per common share:
Dividends declared per common share (in dollars per share)		$ 0.30	$ 0.30	$ 0.90	$ 0.90

[1] Earnings per share may not sum due to rounding