Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator - Basic:
Net income (loss)	$ 4,411	$ (19,618)	$ 1,220	$ (11,330)
Private perpetual preferred unit distributions	(1,051)	(1,047)	(2,101)	(2,097)
Net income (loss) attributable to non-controlling interests	(1,285)	7,872	335	5,129
Earnings allocated to unvested shares	(9)	(25)	(9)	(36)
Net income (loss) attributable to common stockholders – basic	2,066	(12,818)	(555)	(8,334)
Numerator - Diluted:
Net income (loss)	4,411	(19,618)	1,220	(11,330)
Private perpetual preferred unit distributions	(1,051)	(1,047)	(2,101)	(2,097)
Earnings allocated to unvested shares	(9)	(25)	(9)	(36)
Net income (loss) attributable to common stockholders – diluted	$ 3,351	$ (20,690)	$ (890)	$ (13,463)
Denominator:
Weighted average shares outstanding - basic (in shares)	171,615,000	175,433,000	172,183,000	178,029,000
Operating partnership units (in shares)	106,278,000	107,951,000	105,704,000	109,986,000
Effect of dilutive securities:
Stock-based compensation plans (in shares)	543,000	0	0	0
Weighted average shares outstanding - diluted (in shares)	278,436,000	283,384,000	277,887,000	288,015,000
Earnings (loss) per share:
Basic (in USD per share)	$ 0.01	$ (0.07)	$ (0.00)	$ (0.05)
Diluted (in USD per share)	$ 0.01	$ (0.07)	$ (0.00)	$ (0.05)
Antidilutive securities (in shares)	1,051,016	109,649	954,584	254,772